Network Security Analysis Essay Example for Free

net income Security Analysis EssayThis cla employ is concerned rough electronic vane guarantor. It mentions about the present situation of intercommunicate security and an analysis of the reason that lead to unsafe communicate environment. Then the article introduces two frequently utilize protocols in net security HTTP (Hypertext Transport Protocol) and HTTPS (Hypertext Transfer Protocol over Secure Socket Layer), then comp ar them and give a brief conclusion. On the former(a)(a) side, the article introduces how firewall protects network security in hardw ar aspects.Keywords Network Security Analysis Countermeasures1. Introduction As technology develops, network is getting more and more mature. It is cognize to all that security is the second step after that a successful network has been deployed.1.1 Situation of Computer Network SecurityWith the rapid development of the profits and the widespread application, the number of computer viruses, Trojan horses is explos ive growth. According to Jinshan drug gangsters cloud security center monitoring statistics show that in 2008, Jinshan drug gangsters were intercepted more and more new viruses, Trojans, which grew up 40% comp ared with 2007. The center statistics also show that 90% of the virus infected drug users, this attachment web pages that humans are enjoying the network culture with the great riches and convenient at the same time, also be the severe be clip by problems of network information security.The lure of wealth that hackers attack is no longer a kind of personal interest, but more and more reverse an organized, interest driven career crime. Its main way of life has online professor viruses, Trojan horses production technology and various network attack technology Online exchange, trafficking and rental viruses, Trojan horses, zombie network Online customized viruses, Trojan horses Internet larceny behavior (account Numbers game, bank accounts, QQ number, etc.), sell the trumpe ts Internet fraud and extortion Through the network line of work platform money laundering profit, etc. Attackers assume technical level gradually decrease, means more flexible, joint attacks increase rapidly. Trojan viruses, Trojan virus writers, professional hack personnel, sales channels, professional players start been formed complete gray industrial chain.1.2 Threats to Computer Network SecurityThe threat to computer network security includes attacks by hackers and computer virus. It mostly presents in the following aspects.Firstly, send fake E-mails to users. It is a common way to cheat the account and password by posing as countenance websites. Secondly, damage caused by viruses is also a common phenomenon. For e.g. when virus gets into computer, it will cover our hard disk with useless information. Thirdly, its about wildcat accessing. This mainly refers to the normal use or oversteps their authority to use the network equipment and information resources. Fourthly, dam age the integrity of the database. Fifthly, interfere with the normal running of the systems. Finally, parley lines are tapped and people are non familiar about safety of network security. The first situation doesnt occur in common. However, awareness of maintain computer network security is genuinely important.In the article, it mainly analyzes several common situations and introduces what the threat is and how it works.1.3 Countermeasures of Network SecurityAs network security has a lot of loopholes, people create a lot of methods to protect network. On the side of hardware, people begin to use firewall to protect network. On the side of software, a lot of tools and technologies have been used in this area, such as router filtering. The article introduces how firewall works and two similar protocols HTTP and HTTPS. By comparing these two protocols, we will find the development of technology.1.4 Importance of the Study of Network SecurityIts important for securing ones computer, belongings important data and profile information protected. Careful web surfing habits may keep you from being a victim of virus attacks and malware, however this is an intensely risky activity and very often people may end up with an infected computer. Some pricey anti-virus programs will help to keep your computer protected and safe, but users must remember to keep this updated regularly for better protection over new viruses.2. colligate Work2.1 Network SecurityNetwork security consists of the provisions and policies adopted by a network administrator to pr regulart and monitor unauthorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, which is controlled by the network administrator. Users choose or are assigned an ID and password or other authenticating information that allows them access to information and programs within their authority. Network s ecurity covers a variety of computer networks, two public and private, that are used in everyday jobs conducting legal proceeding and confabulations among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which strength be open to public access. Network security is involved in organizations, enterprises, and other types of institutions. It does as its title explains It furbish ups the network, as well as protecting and overseeing trading surgical operations being through with(p). The most common and simple way of protecting a network resource is by assigning it a unique name and a corresponding password.2.2 ISO/OSI modelThe International Standards Organization (ISO) Open constitutions Interconnect (OSI) Reference Model defines seven layers of communications types, and the interfaces among them. (See Figure 1.) Each layer depends on the service provided by the layer below it, all the way down to the physical networ k hardware, such as the computers network interface card, and the wires that connect the cards together. plurality develop a lot of protocols to each layer. Such as PPTP/L2TP to linked layer, IPSEC to network layer, TLS/SSL to take layer. Each protocol includes security information that helps network bump off safer and safer.2.3 IPV4 protocolThe protocol contains a couple aspects which caused problems with its use. These problems do not all relate to security. They are mentioned to gain a comprehensive understanding of the internet protocol and its shortcomings. The causes of problems with the protocol are1. Address Space 2. Routing 3. Configuration 4. Security 5. Quality of ServiceThe lack of embedded security within the IPv4 protocol has led to the umteen attacks seen today. Mechanisms to secure IPv4 do exist, but there are no sine qua nons for their use. IPsec is a specific mechanism used to secure the protocol. IPsec secures the packet payloads by means of cryptography. IPse c provides the operate of confidentiality, integrity, and authentication. This form of protection does not account for the skilled hacker who may be able to break the encryption method and obtain the key.2.4 Types and Sources of Network ThreatsDenial-of-Service, unauthorized access, executing commands illicitly, confidentiality breaches and destructive behavior are common type of threats to network security.The sources of network threats include 3 aspects. Firstly, the invasion of bad information and pollution. Network is open, even borderless space information network of people in the rich cultural life, but also to the illegal dissemination of information or indecent information provided soil British Middlebury Seck Griffith University, Professor Di Mulai study found that in non-academic information on the Internet, 47% of pornography on These content without restriction for people sprightliness free to browse, not only seriously jeopardize the health of young people, and poison the social atmosphere and hinder the building of a harmonious caller in China.In addition, the networks openness and freedom are often some criminals use, or dissemination of endangering national security, to subvert the government, disrupting social order and security of information, or information network organizing rallies and other anti-social activities. Secondly, Internet hackers and computer crime. Hacker wanton rampage information networks, technology and the consequences of its invasion of escalating their use of technical means, or attacks on government sites or military organizations Web site and endanger national security interests, undermine government image or steal business, financial institutions, business information to profit illegally, endangering the economic order or steal personal confidential information, violation of privacy or stolen cash.These acts seriously impede the normal operation of information networks. In addition to outside hackers the use of the Internet, the rampant crime and tort. The use of computer information network system to implement theft, fraud or corruption, embezzlement and other crimes than the traditional criminal methods and tools more subtle complexity, and violation of trade secrets with the network, electronic communications freedoms, civil Privacy and damage the reputation of others and other events are also frequent. Online pyramid schemes, online fraud, etc. These crimes have been on the network posed a serious threat to network security. Thirdly, the existence of their own network security vulnerabilities and risks.Freedom to share and open spirit of the Internet, but also the charm of the Internet The Internet is based on TCP / IP protocol, network devices, operating systems with networking capabilities and openness about the existence inherent vulnerability In addition, the software in the design, it is inevitable there are some defects or flaws, which has become a prime target for hackers, while so ftware programmers deliberately left the back door has become a major network security risks network These weaknesses of their own existence, to bring the work of anti-hacker considerable difficulty on the one hand difficult for scientists to develop a common and effective network security for the protection of technical means on the other hand the lack of implementation of these measures sufficient to protect the social environment.3. Methods 3.1 Analysis of Network SecuritySystem and network technology is a key technology for a wide variety of applications. Security is crucial to networks and applications. Although, network security is a critical requirement in emerging networks, there is a significant lack of security methods that can be easily implemented.There exists a communication gap in the midst of the developers of security technology and developers of networks. Network design is a well-developed process that is based on the Open Systems Interface (OSI) model. The OSI mod el has several advantages when designing networks. It offers modularity, flexibility, ease-of-use, and standardization of protocols. The protocols of distinct layers can be easily combined to create stacks which allow modular development. The implementation of individual layers can be changed later without making other ad looktilyments, allowing flexibility in development. In contrast to network design, secure network design is not a well-developed process. There isnt a methodology to like the complexity of security requirements. Secure network design does not contain the same advantages as network design.When considering network security, it must be emphasized that the entire network is secure. Network security does not only concern the security in the computers at each end of the communication chain. When transmitting data the communication channel should not be vulnerable to attack. A possible hacker could target the communication channel, obtain the data, decrypt it and re-i nsert a false message. Securing the network is just as important as securing the computers and encrypting the message.When developing a secure network, the following need to be considered1. Access authorized users are provided the means to communicate to and from aparticular network.2. Confidentiality Information in the network remains private.3. Authentication Ensure the users of the network are who they say they are4. Integrity Ensure the message has not been modified in transit5. Non-repudiation Ensure the user does not refute that he used the networkHere we mainly discourse fake websites. spurt websites means phishing. Phishing is attempting to acquire information (and sometimes, indirectly, money) such as usernames, passwords, and credit card details by masquerading as a trustworthy entity in an electronic communication. communication theory purporting to be from popular social web sites, auction sites, online payment processors or IT administrators are commonly used to lure the unsuspecting public. Phishing is typically carried out by e-mail spoofing or instant messaging, and it often directs users to enter details at a fake website whose look and feel are almost identical to the legitimate one. Phishing is an example of social engineering techniques used to deceive users, and exploits the poor usability of current web security technologies. Attempts to deal with the growing number of reported phishing incidents include legislation, user training, public awareness, and technical security measures.Once a victim visits the phishing website, the deception is not over. Some phishing scams use JavaScript commands in order to alter the address keep out. This is done either by placing a picture of a legitimate URL over the address bar, or by closing the original address bar and opening a new one with the legitimate URL.An attacker can even use flaws in a trusted websites own scripts against the victim. These types of attacks (known as cross-site scripti ng) are particularly problematic, because they direct the user to sign in at their bank or services own web page, where everything from the web address to the security certificates appears correct. In reality, the link to the website is crafted to carry out the attack, making it very difficult to spot without specialist knowledge. Just such a flaw was used in 2006 against PayPal.A Universal Man-in-the-middle (MITM) Phishing Kit, discovered in 2007, provides a simple-to-use interface that allows a phisher to convincingly reproduce websites and capture log-in details entered at the fake site.To avoid anti-phishing techniques that scan websites for phishing-related text, phishers have begun to use Flash-based websites. These look much like the real website, but hide the text in a multimedia object.3.2 Firewalls ProtectionA firewall can either be software-based or hardware-based and is used to help keep a network secure. Its primary objective is to control the incoming and outgoing netw ork traffic by analyzing the data packets and determining whether it should be allowed through or not, based on a predetermined rule set. A networks firewall builds a brigade between an internal network that is assumed to be secure and trusted, and another network, usually an external (inter)network, such as the Internet, that is not assumed to be secure and trusted.In general, some functions that can be done by the firewall are 1. Doing a packet filter firewall can make the decision whether to accept or reject the incoming data packets. 2. Hiding Network Address (NAT) IP addresses can be used on the internet is a public IP. So to create a client that uses private IP can be translated into public IP. These functions are performed by a firewall, known as NAT. 3. Monitoring and put down to improve network security and logging on the terms monitoring by a firewall.3.3 Protocols of Network SecurityNetwork security protocols are used to protect computer data and communication in transit . The primary tool used to protect information as it travels across a network is cryptography. coding uses algorithms to encrypt data so that it is not readable by unauthorized users. Generally, cryptography works with a set of procedures or protocols that manage the exchange of data between devices and networks. Together, these cryptographic protocols enhance secure data transfer.Without cryptographic network security protocols, Internet functions such as e-commerce would not be possible. Secure communication is necessary because attackers try to eavesdrop on communications, modify messages in transit, and hijack exchanges between systems. Some of the tasks networks security protocols are commonly used to protect are file transfers, Web communication, and Virtual Private Networks (VPN).The most common method of transferring files is victimisation File Transfer Protocol (FTP). A problem with FTP is that the files are sent in clear text, meaning that they are sent unencrypted and t herefore able to be compromised. For example, many webmasters update their sites using FTP an attacker using a packet sniffer and the websites IP address can intercept all communications between the webmaster and the sites server.Here we mainly discuss two similar protocols HTTP and HTTPS.The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web.Hypertext is a multi-linear set of objects, building a network by using logical links (the so called hyperlinks) between the nodes (e.g. text or words). HTTP is the protocol to exchange or transfer hypertext.The standards development of HTTP was coordinated by the Internet Engineering Task Force (IETF) and the World Wide Web Consortium (W3C), culminating in the publication of a serial publication of Requests for Comments (RFCs), most notably RFC 2616 (June 1999), which defines HTTP/1.1, the version of HT TP in common use.Hypertext Transfer Protocol Secure (HTTPS) is a combination of the Hypertext Transfer Protocol (HTTP) with the SSL/TLS protocol. It provides encrypted communication to prevent eavesdropping and to steadfastly identify the web server with which you are actually communicating. Historically, HTTPS connections were primarily used for payment transactions on the World Wide Web, e-mail and for sensitive transactions in corporate information systems. In the late 2000s and early 2010s, HTTPS began to see widespread use for protecting page authenticity on all types of websites, securing accounts and keeping user communications, identity and browsing history private.