Cultural Identity Essay Example for Free

Cultural Identity Essay Stuart Hall beings his discussion on Cultural Identity and Diaspora with a discussion on the emerging new cinema in the Caribbean which is known as Third Cinema. This new form of cinema is considered as the visual representation of the Afro-Caribbean subjects- â€Å"blacks† of the diasporas of the west- the new post colonial subjects. Using this discussion as a starting point Hall addresses the issues of identity, cultural practices, and cultural production. There is a new cinema emerging in the Caribbean known as the Third Cinema. It is considered as the visual representation of the Afro-Caribbean in the post colonial context. In this visual medium â€Å"Blacks† are represented as the new postcolonial subjects. In the context of cultural identity hall questions regarding the identity of this emerging new subjects. From where does he speak? Very often identity is represented as a finished product. Hall argues that instead of considering cultural identity as a finished product we should think of it a production which is never complete and is always in process. He discusses two ways of reflecting on cultural identity. Firstly, identity understood as a collective, shared history among individuals affiliated by race or ethnicity that is considered to be fixed or stable. According to this understanding our cultural identity reflects the common historical experiences and shared cultural codes which provide us as â€Å"one people.† This is known as the oneness of cultural identity, beneath the shifting divisions and changes of our actual history. From the perspective of the Caribbean’s this would be the Caribbeanness of the black experience. This is the identity the Black diaspora must discover. This understanding did play a crucial role in the Negritude movements. It was a creative mode of representing the true identity of the marginalised people. Indeed this act of rediscovery has played crucial role in the emergence of many of the important social movements of our time like feminist, ani-colonial and anti-racist. Stuart Hall also explores a second form of cultural identity that exist among the Caribbean, this is an identity understood as unstable, metamorphic, and even contradictory which signifies an identity marked by multiple points of similarities as well as differences. This cultural identity refers to â€Å"what they really are†, or rather â€Å"what they have become.† Without understanding this new identity one cannot speak of Caribbean identity as â€Å"one identity or on experience.† There are ruptures and discontinuities that constitute the Caribbean’s uniqueness. Based on this second understanding of identity as an unstable Hall discusses Caribbean cultural identity as one of heterogeneous composites. It is this second notion of identity that offers a proper understanding of the traumatic character of the colonial experience of the Caribbean people. To explain the process of identity formation, Hall uses Derridas theory ‘differance’ as support, and Hall sees the temporary positioning of identity as strategic and arbitrary. He then uses the three presencesAfrican, European, and Americanin the Caribbean to illustrate the idea of traces in our identity. A Caribbean experiences three kinds of cultural identities. Firstly, the cultural identity of the Africans which is considered as site of the repressed, secondly, the cultural identity of the Europeans which is the site of the colonialist, and thirdly, the cultural identity of the Americans which is a new world- a site of cultural confrontation. Thus the presence of these three cultural identities offers the possibility of creolization and points of new becoming. Finally, he defines the Caribbean identity as diaspora identity.

Study Of Attacks On E Commerce Systems Computer Science Essay

Study Of Attacks On E Commerce Systems Computer Science Essay Electronic commerce (e-commerce) services nowadays have become a core element and more popular on Internet and Web environment. Electronic commerce, Internet and Web environment have enabled businesses to reduce costs and offer many benefits both to the consumer and to the business. According to Forrester Research the online retail sales in the United stated for 2003 exceeded $100 billion. As the Information Technology and the using of internet are increasing every day, the demand for secure information and electronic services is growing. Every online transaction in the internet can be monitored and stored in many different locations, since the Internet is a public network it makes very important for businesses to understand possible security threats and vulnerabilities to their business. The key factor that affects the success of e-commerce is to exchange security on network. In this paper we will describe some of the security threats and vulnerabilities concerning the e-commerce se curity. Keywords: e-Commerce security, threats, vulnerability, attacks 1. Introduction The improvements that Internet has made during the past few years have changed the way people see and use the Internet itself. The more their use grows, the more attacks aim these systems and the amount of security risks increases. Security has become one of most important issues and significant concern for e-commerce that must be resolved [1]. Every private and public organization is taking computer and e-commerce security seriously more than before because any possible attack directly has an effect in E-commerce business [5]. The Internet and Web environment can provide as many security threats and vulnerabilities as opportunities for a company. The low cost and high availability of the world wide Internet for businesses and customers has made a revolution in e-commerce [1]. This revolution in e-commerce in turn increases the requirement for security, as well as the number of on-line cheats and fraud as it is shown in the Figure 1. Although there has been investments and spent a very large amount of time and money to provide secures networks, still there is always the possibility of a breach of security [5]. According to IC3 2007 annual report, the total dollar loss from all referred complaints of fraud was $239.09 million [3]. The majority of these frauds and cheats were committed over the Internet or similar online services. Security is still a significant concern for e-commerce and a challenge for every company. Mitigate security threats and vulnerability is still a battle for every company [5]. Good security infrastructure means good productivity for the company. Figure 1: Incidents of Internet fraud [15] In this paper in the first section we will give a brief describe of e-commerce and the types of e-commerce, and then in second section we will describe the security issues and some of the threats and vulnerabilities- attacks in e-commerce. Last section discuss various defence mechanism uses to protect e-commerce security which is still high concerns of business. 2. E-commerce Background Information and communication technology has become more and more essential and integral part of businesses. This highly uses of information technology have changed the traditional way of doing business. This new way of doing business is known as Electronic Commerce (E-Commerce) or Electronic Business (E-Business) [12]. Electronic commerce or e-commerce means buying and selling of products or services over the part of internet called World Wide Web. According to Verisign [2004] electronic commerce is a strategic imperative for most competitive organisations today as it is a key to finding new sources of revenue, expanding into new markets, reducing costs, and creating breakaway business strategies. E-commerce includes electronic trading, trading of stocks, banking, hotel booking, purchases of airline tickets etc [2]. There are different types of e-commerce, but we will encompass the e-commerce on there types of business transaction: B2B ( business to business); B2C ( business to consumer); C2C (consumer to consumer) [4]. Business to Business (B2B) e-commerce- is simply defined as commerce transactions among and between businesses, such as interaction between two companies, between e manufacturer and wholesaler, between a wholesaler and a retailer [16]. There are four basic roles in B2B e-commerce suppliers, buyers, market-makers and web service providers. Every company or business plays at least one of them, and many companies or businesses play multiple roles [9]. According to the Queensland governments department of state development and innovation [2001] B2B ecommerce made up 94% of all e-commerce transactions [8]. The good examples and models of B2B are the companies such IBM, Hewlett Packard (HP), Cisco and Dell. Business-to-Consumer (B2C) e-commerce- is the commerce between companies and consumer, businesses sell directly to consumers physical goods (i.e., such as books, DVDs or consumer products), or information goods (goods of electronic material digitized content, such as software, music, movies or e-books) [10]. In B2C the web is usually used as a medium to order physical goods or information goods [8]. An example of B2C transaction would be when a person will buy a book from Amazon.com. According to eMarketer the revenue of B2C e-commerce form US$59.7 billion in 2000 will increase to US$428.1 billion by 2004 [10]. Consumer to Consumer (C2C) e-commerce- this is the type of e-commerce which involves business transactions among private individuals or consumers using the Internet and World Wide Web. Using C2C, costumers can advertise goods or products and selling them directly to other consumers. A good example of C2C is eBay.com, which is an online auction where costumers by using this web site are able to sell a wide variety of goods and products to each other [6]. There is less information on the size of global C2C e-commerce [10]. Figure 2 illustrates some of the e-commerce business describe above. Figure 2: Common e-Commerce business model [14] 3. Security threats to e-commerce Security has three basic concepts: confidentiality, integrity, and availability. Confidentiality ensures that only the authorized persons have access to the information, not access for the unauthorized persons, Integrity ensures the data stored on any devices or during a communication process are not altered by any malicious user, Availability ensures that the information must be available when it is needed [16]. Security plays an important role in e-commerce. The number of online transaction last years has a tremendous increase; this has been accompanied by an equal rise in the number of threats and type of attacks against e-commerce security [13]. A threat can be defined as the potential to exploit a weakness that may result in unauthorised access or use, disclosure of information or consumption, theft or destruction of a resource, disruption or modification [8]. E-commerce environment has different members involved E-commerce network: Shoppers who order and buy products or services Merchant who offer products or services to the shoppers The Software (Web Site) installed on the merchants server and the server The attackers who are the dangerous part of E-commerce network Looking on the above parties involved in the e-commerce network, it is easy to see that malicious hackers threaten the whole network and are the most dangerous part of network. These threats on e-commerce can abuse, misuse and cause high financial loss to business. Figure 3 briefly displays the methods the hackers use in an E-commerce network [11]. Figure 3: Target points of the attacker [11] The assets that must be protected to ensure secure electronic commerce in an E-commerce network include client (shopper) computers or client-side, transaction that travel on the communication channel, the Web site on the server and the merchants server- including any hardware attached to the server or server-side. Communication channel is one of the major assets that need to protect, but it is not the only concern in e-commerce security. Client- side security form the users point of view is the major security; server-side security is a major concern form the service providers point of view. For example, if the communication channel were made secure but no security measure for either client-side or server-side, then no secure transmission of information would exist at all [1, 2]. According to Figure 3 above there are some different security attack methods that an attacker or hacker can use to attack an E-commerce network. In the next section we will describes potential security attack methods. 4. Possible Attacks This section overviews and describes various attacks that can occur in the sense of an e-commerce application. Moreover, ethical aspects are taken into consideration. From an attackers point of view, there are multiple actions that the attacker can perform, whereas the shopper does not have any clue what is going on. The attackers purpose is to gain access to each and every information in the network flow from the when the buyer has pressed the buy button until the web site server has responded back. Furthermore, the attacker tries to attach the application system in a most discrete and ethical way. An onview of various attacks on ecommerce are given: Tricking the Shopper: One very profitable and simple way of capturing the shoppers behaviour and information to use against the attacker is by tricking the shopper, which in other words is known as the social engineering technique. This can be done in various ways. Some of them are: An attacker can call the shopper, representing to be an employee from a shopping site to extract information about the shopper. Thereafter, the attacker can call the shopping site and then pretend to be the shopper and ask them for the user information, and further ask for a password to reset the user account. This is a very usual scenario. Another example would be to reset the password by giving information about a shoppers personal information, such as the date of birth, mothers maiden name, favourite movie, etc. If it is the case the shopping websites gives away these information out, then retrieving the password is not a big challenge anymore. A last way of retrieving personal information, which by the way is used a lot during the world wide web today, is by using the phishing schemes. It is very difficult to distinguish for example, www.microsoft.com/shop with www.micorsoft.com/shop . The difference between these two is a switching between the letters r and o. But by entering into the wrong false shop to pretend to be an original shop with login forms with password fields, will provide the attacker all confidential information. And this is performed if the shopper mistypes this URL link. The mistyped URL might be sent through email and pretend to be an original shop without any notice from the buyer [11, 15]. Password Guessing: Attackers are also aware of that is possible to guess a shoppers password. But this requires information about the shopper. The attacker might need to know the birthday, the age, the last name, etc. of the shopper, to try of different combinations. It is very common that the personal information is used into the password by many users through the internet, since they are easy to be remembered. But still, it needs a lot of effort from the attackers view, to make a software that guesses the shoppers password. One very famous attack might be to look up words from the dictionary and use these as passwords, this is also known as the dictionary attack. Or the attacker might look at statistics over which passwords are most commonly used in the entire world [15]. Workstation Attack: A third approach is to trying to attack the workstation, where the website is located. This requires that the attacker knows the weaknesses of the workstation, since such weak points are always presented in work stations and that there exist no perfect system without any vulnerabilities. Therefore, the attacker might have a possibility of accessing the workstations root by via the vulnerabilities. The attacker first tries to see which ports are open to the existing work station by using either own or already developed applications. And ones the attacker has gained access to the system, it will therefore be possible to scan the workstations information about shoppers to retrieve their ID and passwords or other confidential information. Network Sniffing: When a shopper is visiting a shopping website, and there is a transaction ongoing, then the attacker has a fourth possibility. The possibility is called sniffing. That an attacker is sniffing means that all data which is exchanged between the client and server are being sniffed (traced) by using several applications. Network communication is furthermore not like human communication as well. In a human communication, there might be a third person somewhere, listening to the conversation. In the network communication technology, the data which is sent via the two parties are first divided in something called data packages before the actual sending from one part to another. The other part of the network will therefore gather these packages back into the one data which was sent to be read. Usually, the attacker seeks to be as close as possible to the either the shoppers site or near the shopper to sniff information. If the attacker places himself in the halfway between the shopper and website, the attacker might therefore retrieve every information (data packages). Given an example in this, then assuming a Norwegian local shopper wants to buy an item from a webshop located in the United States of America. The first thing which will happen is that the personal information data which is being sent from the shopper will be divided into small pieces of data to the server located in the USA. Since the data flow over the network is not controlled by the human, the packages might be send to different locations before reaching the destination. For instance, some information might go via France, Holland and Spain before actually reaching the USA. In such a case, the sniffer/attacker was located in France, Holland or Spain, will mean that the attacker might not retrieve every and single information. And given that data, the attacker might not analyze and retrieve enough information. This is exactly the reason why attackers are as close as possible to either the source or the destination point (client side or server side). Known Bug Attack: The known bug attack can be used on both the shoppers site and on the webpage site. By using already developed tools, the attacker can apply these tools to find out which software to the target the server is having and using. From that point, the attacker further need to find patches of the software and analyze which bugs have not been corrected by the administrators. And when knowing the bugs which are not fixed, the attacker will thus have the possibility of exploiting the system [11]. There are still many various of attacks one can do more than these described above. More attacks that be used against ecommerce application could by doing Denial of Service (DOS) attacks where the attacker impact the servers and by using several methods, the attacker can retrieve necessary information. Another known attack is the buffer overflow attack. If an attacker has gained access to the root, the attacker might further get personal information by making his own buffer, where all overflow (information) is transferred to the attackers buffer. Some attackers also use the possibility looking into the html code. The attacker might retrieve sensitive information from that code, if the html is not well structured or optimized. Java, Javascript or Active X export are being used in html as applets, and the attacker might also distort these and set a worm into the computer to retrieve confidential information. 5. Defence For each new attack presented in the real world, a new defence mechanism needs further to be presented as well to protect the society from unsuspicious issues. This section introduce some defence issues how to protect the attacks described in the section before. However, the main purpose from an sellers point of view in an ecommerce application is to protect all information. Protecting a system can be performed in several ways. Education: In order to decrease the tricking attacks, one might educate all shoppers. This issue requires a lot of effort in time and not simple, since many customers still will be tricked by common social engineering work. Merchants therefore have to keep and remind customers to use a secure password since this person is used as the identity. Therefore it is important to have different passwords for different websites as well and probably save these passwords in a secure way. Furthermore, it is very important not to give out information via a telephone conversation, email or online programs. Setting a safe Password: It is very important that customers do not use passwords which are related to themselves, such as their birthdays, childrens name, etc. Therefore it is important to use a strong password. A strong password has many definitions. For example, the length of passwords is an important factor with various special characters. If a shopper cannot find a strong password, then there are many net sites proving such strong passwords. Managing Cookies: When a shopper registers into a website with personal information, a cookie is being stored into the computer, so no information is needed to be entered again at next logon. This information is very useful for an attacker, therefore it is recommended to stop using cookies, which is an very easy step to do in the browser [11]. Personal Firewall: An approach of protecting the shoppers computer is by using a personal firewall. The purpose of the firewall is to control all incoming traffic to the computer from the outside. And further it will also control all out coming traffic. In addition, a firewall has also an intrusion detection system installed, which ensures that unwanted attempts at accessing, modification of disabling of the computer will not be possible. Therefore, it is recommended that a firewall is installed into the pc of a shopper. And since bugs can occur in a firewall, it is therefore further important to update the firewall [11]. Encryption and decryption: All traffic between two parties can be encrypted from it is being send from the client and decrypted when it has been received until the server, vice versa. Encrypting information will make it much more difficult for an attacker to retrieve confidential information. This can be performed by either using symmetric-key algorithms or asymmetric key algorithms [11]. Digital Signatures: Like the hand signatures which are performed by the human hand, there is also something known as the digital signature. This signature verifies two important things. First, it checks whether the data comes from the original client and secondly, it verifies if the message has been modified from it has been sent until it was received. This is a great advantage for ecommerce systems [11]. Digital Certificates: Digital signature cannot handle the problem of attackers spoofing shoppers with a false web site (man-in-the-middle-attack) to information about the shopper. Therefore, using digital certificates will solve this problem. The shopper can with very high probability accept that the website is legal, since it is trusted by a third party and more legal party. In addition, a digital certificate is not a permanent unlimited time trusted. Therefore one is responsible to see if the certificate is still valid or not [11]. Server Firewall: Unlike personal firewall, there is also something known as the server firewall. The server firewall is an more advanced program which is setup by using a demilitarized zone technique (DMZ) [11]. In addition, it is also possible to use a honey pot server [11]. These preventions were some out of many in the real world. It is very important to make users aware and administrators update patches to all used application to further protect their systems against attacks. One could also analyze and monitor security logs which are one big defence strategy, to see which traffic has occurred. Therefore it is important that administrators read their logs frequently and understand which parts have been hit, so administrators can update their system. 6. Conclusion In this paper firstly we gave a brief overview of e-commerce and its application, but our main attention and the aim of this paper was to present e-commerce security issues and various attacks that can occur in e-commerce, also we describe some of the defence mechanism to protect e-commerce against these attacks. E-commerce has proven its great benefit for the shopper and merchants by reducing the costs, but e-commerce security is still a challenge and a significant concern for everyone who is involved in e-commerce. E-commerce security dose not belong only technical administrators, but everyone who participate in e-commerce- merchants, shopper, service provider etc. Even there are various technologies and mechanisms to protect the E-commerce such as user IDs and passwords, firewall, SSL, Digital certificates etc, still we need to be aware and prepared for any possible attack that can occur in e-commerce.

Basic Firewall Operation Computer Science Essay

Basic Firewall Operation Computer Science Essay A firewall is a piece of software or hardware that filters all network  traffic between the computer, local network or commercial network and  Internet.  Firewall is a component of a computer system or network  designed to block unauthorized access while  allowed   communication.  It is a device or group of devices  configured  deny, encrypt, decrypt, or proxy all (inside and outside) traffic  team  between different security domains based on a set   Firewalls can be implemented in hardware or  software,  or  a combination of both.  A firewall can be few rules  determine what traffic is  being permitted inside or outside your home network.  Depending on the  type  firewall in place, access to certain  IP addresses or domain  names, or you can block certain types of traffic by blocking  of  TCP / IP  the ports they use.  There are basically four mechanisms used by servers  security limit  traffic.  A device or program can use more than one of these in  relationship  together for more depth protection.  The four mechanisms  of  packet filtering, circuit-level gateway, the  proxy-server and application  Gateway. However, Firewall has some drawbacks.  Initial equipment cost is the main factor that determines the  Better communication technology network security  required.  The firewall cannot protect against attacks that bypass  firewall.  To  For example, dial-in and dial-out access.  The firewall does not protect against internal threats.  The firewall cannot protect against transmission of the virus  infection  programs or files.  It would be impractical and perhaps  impossible to scan  all incoming files, emails and messages for  virus   Time to time, the use of cheaper Internet and  links  much faster.  This leaves many people always want to  use long time. It is  increasing the exposure of computers to various  threats   Internet.  When using an anti-virus software protects  computers  viruses, not other forms of Internet intruders.  A server  Safety  bodyguard keep between your computer and the Internet,  decide what doors to open, and that can come Overview of Firewall -II A firewall examines all traffic sent between two networks to see if it meets certain criteria. If so, is routed between the networks, otherwise it stops. A firewall filters incoming and outgoing traffic. You can also manage public access to private networked resources such as host applications. It can be used to record all attempts to enter the private network and trigger alarms when hostile or unauthorized entry attempt. Firewalls can filter packets based on their source and destination addresses and port numbers. This is known as address filtering. Firewalls can also filter specific types of network traffic. This is also known as protocol filtering because the decision to forward or reject traffic depends on the protocol used, such as HTTP, FTP or Telnet. Firewalls can also filter traffic by packet attribute or state. A firewall cannot prevent individual users with modems to dial in or outside the network without going through the firewall at all. Employee misconduct or negligence cannot be controlled by firewalls. Policies regarding use and misuse of passwords and user accounts must be strictly enforced. These are management issues that must be asked in the planning of any security policy, but cannot be solved with firewalls alone. [5] 2.1Advantages of Firewalls Firewalls have a number of advantages. They can stop incoming requests for services, fundamentally insecure, as may be prohibited or rlogin RPC services such as NFS. They can control access to other services such as bars appellants from certain IP addresses, use the filtering service (incoming and outgoing), for example, to stop hiding information about FTP, in writing, for example, allowing access only to certain directories or systems Are more profitable than ensuring every guest on the corporate network, as it is often only one or a few systems firewall concentrate. They are safer for every guest, because of the complexity of the software on the machine which makes it easier for security holes appear. 2.2 Disadvantages of Firewalls Firewalls are not the alpha and omega of network security. They have some disadvantages, such as: It is a focal point for attack, and if a hacker penetrates the firewall that can have unlimited access to the corporate network. You can prevent legitimate users access to services of value, for example, business users will not be released to the web or when working outside the home to a business user can not access the organization track network. No protection against attacks from the back door, in May and encourage users enter and exit through the door, especially if the restrictions are too severe service. Examples of entry points to the back door of the network business are: modems, and import and export unit. The security policy should cover such aspects as well. They can be a bottleneck for the flow, since all connections must pass through the firewall system. Firewall systems themselves can not protect the network against smuggling of import or export of material to prohibit such game programs firewalls as attachments to email messages. Smuggling could also be an important source of infection if users download software from external newsletters recent Melissa virus and the Love Bug have been smuggled into the e-mails to unknown recipients. This is an area that security policy must be addressed. There are software programs that can help in this instance MIMEsweeper runs on the firewall and monitoring of e-mail attachments before you let them pass. It will remove potentially dangerous attachments or prevent the mail from all over. The main disadvantage of a firewall is that it protects against the aggressor inside. Like most computer crimes are perpetrated by corporate internal users, a firewall offers little protection against this threat. For example, an employee may not be able to email sensitive data on the site, but may be able to copy on a floppy and after it. Therefore, organizations need to balance the amount of time and money they spend on the firewall with one on other aspects of information security. [3] Firewall function III There are two methods of denial of access used by firewalls. A firewall may allow all traffic through unless it meets certain criteria, or you can deny all traffic unless it meets certain criteria (see Figure 3.1). The type of criteria used to determine whether to allow traffic through varies from one type of firewall to another. Firewalls may be concerned about the type of traffic, or source or destination addresses and ports. They can also use complex rule bases that analyze the application data to determine whether traffic should be allowed to pass. How a firewall determines what traffic to pass depends on the network layer it operates.[5] Figure 3.1: Basic Firewall Operation Firewall Types IV A real firewall is hardware and software that intercepts data between the Internet and your computer. All data traffic must pass through it, and the firewall allows the data is allowed through the corporate network. Firewalls are typically implemented using one of four major architectures: â‚ ¬Ã‚  Packet Filters â‚ ¬Ã‚  Application Gateways â‚ ¬Ã‚  Circuit -level Gateways â‚ ¬Ã‚  State -full inspection 3.1 Packet Filters The first line of defence in protecting firewalls and most fundamental is the packet filtering firewall. Packet filters operate at the network layer to examine incoming and outgoing packets and applying a fixed set of rules for determining whether packets are allowed to pass. The firewall packet filtering is generally very fast because it does not take into account some of these data in the packet. Just analyze the header of IP packet, IP addresses, source and destination, and combinations of ports and then applies filtering rules. For example, it is easy to filter all packets destined to port 80, which could be wearing a Web server. The administrator can decide which port 80 is off limits except to certain IP subnets, and a packet filter would suffice. Packet filtering is fast, flexible, transparent (no changes required on the client) and inexpensive. Most routers offer capacities of packet filtering and pure firewall packet filter does not require powerful hardware. This type of filter is commonly used in businesses small and medium enterprises that need to control users can or can not go. IP addresses can be distorted by this type of filter media itself is not sufficient to stop an intruder from accessing your network. However, a packet filter is an important component of a server solution for complete security. [4 vara] Fig 4.1 packet filtering[4] 3.2 Circuit-level Gateways A step above the standard packet filtering firewall, but still considered part of the same architecture, are the gates of the circuit, also known as Stateful Packet Inspection. In the circuit level firewall, all connections are monitored and connections that are deemed valid are allowed to cross the firewall. This usually means that the client behind the firewall can initiate any type of session, but customers outside the firewall can not see or connect to a machine protected by the firewall. State inspections usually occur in the network layer, which makes it fast and preventing suspect packets travel up the protocol stack. Unlike static packet filtering, however, an inspection of State takes decisions on the basis of all data in the packet (which corresponds to all levels of the OSI model). Using this information, the firewall builds dynamic state tables. Use these tables to keep track of connections through the firewall instead of allowing all packets meeting the requirements of all rules to adopt, allows only the packets that are part of a valid connection, prepared social. The firewall packet filtering is popular because they tend to be cheaper, faster and relatively easy to configure and maintain. [4vara] Fig. 7.2: Circuit Proxy 3.3 Application Proxies Working in the implementation of the OSI model, proxy firewall forces all client applications on workstations protected by the firewall to use the firewall as a gateway. The firewall allows each package for each different protocol. There are some drawbacks to using this type of firewall. Each client program must be configured to use a proxy, and not everyone can. In addition, the firewall must have a representative in the same for each type of protocol that can be used. This May, a delay in the implementation of new protocols, if the firewall does not. The penalty paid for this extra level of security is the performance and flexibility. Firewall proxy server processor and large memory to support many simultaneous users, and the introduction of new Internet applications and protocols can often involve long delays, while developing new powers to support them. True proxies are probably the safest, but to impose a surcharge on the network load. Dynamic packet filtering is definitely faster, but the highest end firewall these days are hybrids, incorporating elements of all architectures. [4vara] Fig. 7.3: Application Proxy 3.4 Stateful Inspection The optimal firewall is one that provides the best security with the fastest performance. A technique called Stateful Multi-Layer Inspection (SMLI) was invented to make security tighter while making it easier and less expensive to use, without slowing down performance. SMLI is the foundation of a new generation of firewall products that can be applied across different kinds of protocol boundaries, with an abundance of easy-to-use features and advanced functions. SMLI is similar to an application proxy in the sense that all levels of the OSI model are examined.Instead of using a proxy, which reads and processes each packet through some data manipulation logic, SMLI use traffic-screening algorithms optimized for high-throughput data parsing. With SMLI, each packet is examined and compared against known state (i.e., bit patterns) of friendly packets one of the advantages to SMLI is that the firewall closes all TCP ports and then dynamically opens ports when connections require them. This feature allows management of services that use port numbers greater than 1,023, such as PPTP, which can require added configuration changes in other types of firewalls. Statefu inspection firewalls also provide features such as TCP sequence-number randomization and UDP filtering. [5vara] Fig. 7.4 : Stateful Inspection firewalls inspect in each type Packet Filtering Data link header Internet header Transport header Application header Data Circuit Filtering Data link header Internet header Transport header Application header Data + Connection state Application Gateway Data link header Internet header Transport header Application header Data + Connection state application state Hardware Firewalls and Software Firewalls V 5.1 Hardware Firewalls Hardware firewall can be purchased as a standalone product, but more recently hardware firewalls are typically found in broadband routers, and should be regarded as an important part of your system and network settings, especially for those who have broadband. Hardware firewalls can be effective with little or no configuration, and can protect every machine on a LAN. Most hardware firewalls will have a minimum of four network ports to connect other computers, but for large networks, firewall solutions for enterprise networks are available. A hardware firewall uses packet filtering to examine the packet header to determine their origin and destination. This information is compared to a set of predefined rules or created by the user determine if the packet is sent or deleted.[2] As with any electronic equipment, a user with general computer skills can connect a firewall, adjust a few settings that work. To ensure that the firewall is configured for optimal security and protection, however, consumers certainly have to learn the features of your hardware firewall, to enable them, and how to test your firewall to secure your done a good job of protecting your network. Firewalls are not all equal, and it is important to read the manual and the documentation that came with the product. In addition the manufacturers site will generally have a database or FAQ to get you started. If the terminology is a bit too tech-oriented, you can use my library technical terms to help you get a better understanding of certain terms of technology and equipment is where you configure your hardware firewall. To test the security of your hardware firewall, you can buy third party software or a review of research on the Internet for a free online service that is based on testing of firewalls. Test firewall is an important element of maintenance to ensure that your system is configured for optimal protection provided.[2vara] Figure-1 Hardware Firewall Hardware firewall providing protection to a Local Network [3vara] 2.2 Software Firewalls For users of the detached house, choosing the most popular firewall is firewall software. Firewall software installed on your computer (like any software) and can be customized, allowing some control over its function and protection features. A firewall software to protect your computer from outside attempts to control or access your computer, and your choice of firewall software, you can provide protection against Trojans, the most common or e-mail to. Many software firewalls that the user defined controls for setting up files and share printers and block harmful applications from running on your system. In addition, the firewall software may also include access control, Web filtering and more. The disadvantage of software firewall is that it protects only the computer that are installed, no network, so that each team must have a software firewall is installed. [2] As hardware firewalls are a large number of firewalls to choose from. To begin, we recommend you read the comments of firewall software and search the product website to get some initial information. Because your firewall is always running on your computer, you must take note of system resources will be required to execute and possible incompatibilities with your operating system. A good software firewall will run in the background on your system and use only a small amount of system resources. It is important to monitor firewall software, once installed and to download updates provided by the developer. The differences between software and hardware firewall are enormous and the best protection for your computer and the network is to use both because each offers different, but very necessary for safety and performance. Update your firewall and your operating system is essential to maintain optimal protection because it is proof of your firewall to ensure it is connected and working properly. [2 vara] Figure-2 Computer with Firewall Software Computer running firewall software to provide protection [3 vara] Table 5.1: firewall comparison Advantages Disadvantages Hardware Firewall Operating system independent Not vulnerable to malicious attacks Better performance Focuses on only firewall-related duties Can be single point of failure Higher administrative overhead Higher cost to implement and maintain Software Firewall Less expensive to implement and maintain Lower administrative overhead Dependent upon host operating system Requires additional host hardware, Vulnerable to malicious attacks, Lower performance [6]

Slave Trade in 1807 Essay -- England

In order to ascertain how significant beliefs and ideologies were in contributing to the abolition of the slave trade in 1807, and the eventual abolition of slavery in 1833, this assignment will consider moral, political,economic and religious factors which culminated into these two distinct reforms. It will explore the influence of Enlightenment; the impact of non-conformists; the role of individuals and resistance from slaves themselves. Additionally, it will look at the attitudes concerning the Atlantic slave trade and slavery from different perspectives. Justifications which were gleaned from the Bible, and from Antiquity, regarding the differences between white and black people meant that for much of the eighteenth century enslaving Africans was generally accepted. However, from the 1800s these beliefs and ideologies were challenged, and both slavery and the slave trade were progressively questioned and condemned. Enlightenment thinkers were instrumental in debates in which reason and intellect were dominant. They believed that individuals had the capacity to improve both themselves, and their environment. Underpinning Enlightenment ideas were the concepts of human and natural rights. Furthermore, the idea that the fundamental right of property is one's own person diminished the argument that any attack on slavery was an attack on property. Enlightened ideas influenced individuals such as Adam Smith who was concerned with economic policy,and Elizabeth Heyrick, who was a middle-class Quaker who pushed for immediate emancipation. (Unit 16,pp.87) Anthology 4.4 (a) and (b) provides definitions of slavery and the slave trade. The principal points raised are that men were born free and equal so slavery was contrary to natural... ... ideologies which resulted in the anti-slavery stance which was integral for political reform. The abolition of the slave trade did not result in the immediate emancipation of slavery, the role of individuals who worked tirelessly with the development of campaigning techniques such as, mass petitioning, door-to-door campaigning, public meetings and the gathering of evidence were extremely valuable to the anti-slavery movement. Even still this process was a long one, and one that involved ordinary people, resistance from slaves themselves and pressure groups. Beliefs and ideologies, were therefore, the most fundamental factor for the abolition of both the Atlantic slave trade (1807) and slave emancipation (1833). The position of parliament and the enactments which resulted were heavily influenced by the beliefs and ideas of people who collectively made a difference.

What does religion do for us? :: essays research papers

  Ã‚  Ã‚  Ã‚  Ã‚  What exactly does religion do for us? Sure, it’s a nice concept that makes one believe in other worldly things. Spirits and angels flood the heads of many children whose parents partake in the average slice and dice of Catholic smorgasbords, but what does it do for their souls? Are they all just workaholics who need a reason to be the way they are, or are they monsters merely extending a strange and open faà §ade in order to gain acceptance in the afterlife? All the same, religion does have its effect on many.   Ã‚  Ã‚  Ã‚  Ã‚  What we can be sure of is that the preachers believe in what they’re saying. Or do they? The display of onerous, burdensome stages of guilt seem to plague most of the bible passages, but no harm is seen in the acceptance of these. Sure they are all hand-me-downs of rinse cycle lives, but who is the one to blame for all this? Is it God? Or is there one to blame for all of this? What kind of question is to be answered by this cunning display of fortitude? The fact that their focus determines their reality has nothing to do with the audience captivated by the stunning repetition so often spoke, but it often is said that it does. One should believe in such a myth because of its popularity and outright approval.   Ã‚  Ã‚  Ã‚  Ã‚  Could the choir have something to do with why religion is so popular? Do angelic voices seem to enslave mans ideals and shun them to the furthest reaches of space, or is that done himself? One must come to believe in a God he cannot see because of the hymns blissfully sung by the elder women who have retired many years ago and have nothing better to do with their time than go to choir practice. In these extraordinary hymnals, people are told how much God and Jesus love them, and that the soul is free to choose its place. It makes one wonder if they have a soul.

The Tuskegee Experiment

The Tuskegee experiment was yet another demonstration of racial inequalities and dehumanization illustrated by a people who believed in racial superiority. The experiment was unethical and demoralizing from the beginning. The analysis was corrupt and unethical for a plethora of reasons. The experiment disregarded several basic principles of the American Sociological Association’s code of ethics. Perhaps the greatest flaw in the experiment was the intended denial of treatment, which, in turn, directly affected the subject’s safety, violating the code of ‘protecting subjects from personal harm’. Respect the subject’s right to privacy and dignity’ is an additional custom in the code of ethics ignored. The researchers clearly could not even conceive the thought of respecting these â€Å"inferior racial guinea pigs†, not their health, their dignity, or their humanity. The fact that these men were made a mockery of, lied to, and belittled aff irms that the informed consent was nothing more than a deceitful tactic to involve the individuals.The men were advised that they were ill and were promised care, and were not told they were participants in an experiment, which precisely disrupts the code of ‘seeking informed consent when data are collected from research participants or when behavior occurs in a private context’. Though the event preceded the declaration of the informed consent notion, it is still fraudulent because of the timeline and deceptions planned and carried out by the conductors, therefore it should still be factored in, because of the depth and the fact that the participants were bamboozled.The fact that the treatments were ineffective have nothing to do with the experiment being ethical, as far as the conductors were concerned, treatment was out of the equation anyway, so the fact that the dosages were toxic is irrelevant. The advanced nature of the syphilis in each patient contributes to the prevailing thought that the study was not only misguided, but unscrupulous as well. These men needed immediate medical care, but the urgency was of no concern to the researchers.The fact that these men were told they were ill (and that they were) and promised care, but were denied it, provides further evidence that experiment should have been stopped before it was even initialized, but realistically that was not going to happen. When the patients began dying off, the researchers should have stepped in, stopped the study and treated the patients, but because of the â€Å"ignorance and easily influence nature† of the subjects, they were not given treatment.Ignorance is deemed the right term indeed, but only because the researchers left out the whole nature of the experiment. They were given placebos, food, shelter, and constant letters informing them they were being treated and followed up on. Initially, I believe the patients were, in a way, excited about the treatment, becau se they thought it was just that, treatment. The participants were not too quick to jump into the research though, until of course, they were given incentives, their cooperation was built on the promise of help and generosity of mankind.As time moved forward, I believe they were still hopeful due in part to the fabrication of treatment, but maybe a bit suspicious, hence the start of the covers for burial preparations if death, in fact, struck them. As the years progressed, many participants died, from the severity of their illness, so therefore much of the primary evidence of feelings and emotions is not known. Over time, I expect that the attitudes toward the experiment, from the perspective of the participants and outsiders, did indeed change, and not positively. In decades following, the attention became negative, angry, and impatient.As of now, I believe people, of all races, are utterly disgusted and outraged. The fact that this continued for nearly forty years is incredible an d ridiculous. Withholding information of this magnitude, which affects one’s health or safety is unacceptable. In other studies, it can be accepted, because many times, knowing the intent of an experiment can alter the outcome, defined in the Hawthorne Effect. So long as the study does not inflict harm or danger to its subjects, both physically and mentally, withholding information can be justified.When an experiment is found to be unethical or corrupt period, the information gathered should be discarded and not used or profited for the advancement of science, because that in turn, discredits science in general. If the results were to be published and interpreted, being incorrect, then future experiments and observations founded on these primitive notions will not only be invalid, but could lead to negative effects. To conclude, not only was the trail immoral and unethical, it could have potentially changed the face of science and how we look at diseases, such as syphilis its elf.

Geometry: Indifference Curve, Budget Line, Equilibrium of Consumer Essay

Research the Following: 1. Indifference Curve – An indifference curve is a graph showing combination of two goods that give the consumer equal satisfaction and utility. Definition: An indifference curve is a graph showing combination of two goods that give the consumer equal satisfaction and utility. Each point on an indifference curve indicates that a consumer is indifferent between the two and all points give him the same utility. Description: Graphically, the indifference curve is drawn as a downward sloping convex to the origin. The graph shows a combination of two goods that the consumer consumes. The above diagram shows the U indifference curve showing bundles of goods A and B. To the consumer, bundle A and B are the same as both of them give him the equal satisfaction. In other words, point A gives as much utility as point B to the individual. The consumer will be satisfied at any point along the curve assuming that other things are constant. 2. Budget Line – A graphical depiction of the various combinations of two selected products that a consumer can afford at specified prices for the products given their particular income level. When a typical business is analyzing a two product budget line, the amounts of the first product are plotted on the horizontal X axis and the amounts of the second product are plotted on the vertical Y axis. -A consumer’s budget line characterizes on a graph the maximum amounts of goods that the consumer can afford. In a two good case, we can think of quantities of good X on the horizontal axis and quantities of good Y on the vertical axis. The term is often used when there are many goods, and without reference to any actual graphs. Example: Rose Bole has only $100 to spend on her two passions in life: buying books and attending movies. If all books cost $5.00 and all movies cost $2.50 (these are simply assumptions to make the problem easier–as is the assumption that only two items are involved in the problem), the graph below  shows the options open to Rose. The budget line is a frontier showing what Rose can attain. 3. Equilibrium of Consumer – Consumer Equilibrium can be explained as the point where a consumer gets the maximum amount of satisfaction from the choice he makes between 2 or more competing products. Any deviation from this point results in less satisfaction. For example, a consumer with limited income may wish to purchase both fruit and vegetables. However, the more fruit he buys, the less vegetable he can purchase and vice versa. The consumer equilibrium point will be a point at which he can purchase enough of each to gain the maximum satisfaction with his purchase decision. Example: The weekly demand and supply schedule for a brand of soft drink at various prices (between 30p and  £1.10p) is shown opposite. Equilibrium As can be seen, this market will be in equilibrium at a price of 60p per soft drink. At this price the demand for drinks by students equals the supply, and the market will clear. 500 drinks will be offered for sale at 60p and 500 will be bought – there will be no excess demand or supply at 60p.