Network Security Analysis Essay

This hold is concerned around meshwork warranter. It mentions somewhat the present role of net shelter and an analysis of the reason that withdraw to unsafe profit environment. Then the article introduces two frequently utilize protocols in cyberspace warranter HTTP (Hypertext Transport communications protocol) and HTTPS (Hypertext Transfer communications protocol oer Secure Socket Layer), then comp atomic number 18 them and give a brief conclusion. On the other case, the article introduces how firewall cling tos vane security in hardw ar aspects.Keywords internet hostage Analysis Countermeasures1. Introduction As technology develops, net profit is get under ones skin more and more mature. It is kn decl atomic number 18 to all that security is the second stride after that a successful interlocking has been deployed.1.1 Situation of Computer profit SecurityWith the rapid development of the Internet and the widespread application, the number of computing de vice computer vir drug ab go fors, trojan horses is explosive growth. According to Jinshan drug gangsters cloud security stub proctoring statistics show that in 2008, Jinshan drug gangsters were intercepted more and more sassy viruses, Trojans, which grew up 40% comp bed with 2007. The center statistics likewise show that 90% of the virus infected users, this attachment web pages that humans be enjoying the net profit breeding with the great wealth and convenient at the very(prenominal) time, also be the severe be situated by problems of internet learning security.The lure of wealth that taxicabs attack is no longer a kind of personal interest, moreover more and more become an organized, interest driven career crime. Its principal(prenominal) elbow room has online professor viruses, Trojan horses production technology and various network attack technology Online central, trafficking and rental viruses, Trojan horses, zombie network Online customized viruses, Trojan h orses Internet theft behavior (account Numbers game, bank accounts, QQ number, etc.), sell the trumpets Internet blind and extortion Through the network business platform money laundering profit, etc. Attackers need technical level gradually decrease, office more flexible, joint attacks increase rapidly. Trojan viruses, Trojan virus writers, headmaster hack personnel, sales channels, professional players tolerate been formed complete ancient industrial chain.1.2 Threats to Computer profit SecurityThe flagellum to computer network security includes attacks by hackers and computer virus. It mostly presents in the following aspects.Firstly, devote fake E-mails to users. It is a car park way to cheat the account and word of honor by posing as legitimate websites. Secondly, impairment ca apply by viruses is also a super acid phenomenon. For e.g. when virus gets into computer, it leave behind cover our hard record book with useless data. Thirdly, its about self-appointed accessing. This mainly refers to the normal use or oversteps their authority to use the network equipment and schooling resources. Fourthly, damage the ace of the database. Fifthly, interfere with the normal running of the systems. Finally, communication lines are tapped and stack are non familiar about safety of network security. The first situation doesnt occur in common. However, awareness of maintain computer network security is really 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 solidification of loopholes, people create a hook 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 utilize in this area, such as router filtering. The article introduces how firewall works and two similar protocols HTTP and HTTPS. By co mparing these two protocols, we will find the development of technology.1.4 Importance of the Study of Network SecurityIts important for securing ones computer, keeping important data and profile culture protected. wide-awake web surfing habits may keep you from existence a victim of virus attacks and malware, however this is an intensely risky activity and very ofttimestimes people may end up with an infected computer. Some peachy anti-virus programs will help to keep your computer protected and safe, but users moldiness remember to keep this updated regularly for better protection over fresh viruses.2. Related Work2.1 Network SecurityNetwork security consists of the furnish and policies adopted by a network administrator to prevent 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 administrato r. 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 security covers a variety of computer networks, both public and private, that are apply in everyday jobs conducting transactions and communications among businesses, government agencies and item-by-items. Networks can be private, such as within a company, and others which might be hired man to public access. Network security is involved in transcriptions, enterprises, and other types of institutions. It does as its title explains It goods the network, as well as defend and overseeing deeds 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 feignThe International Standards Organization (ISO) Open Systems Interconnect (OSI) theatrical role Model defines seven layers of communications types, and the ports among them. (See Figure 1.) separately layer depends on the services provided by the layer below it, all the way carry out to the physical network hardware, such as the computers network interface card, and the wires that connect the cards together.People develop a lot of protocols to each layer. Such as PPTP/L2TP to linked layer, IPSEC to network layer, TLS/SSL to transfer layer. Each protocol includes security information that helps network transfer 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 dishThe escape of embedded security within the IPv4 protocol has led to the umpteen another(prenominal) attacks seen today. Mechanisms to secure IPv4 do ex ist, but there are no requirements for their use. IPsec is a specific mechanism used to secure the protocol. IPsec secures the piece of ground payloads by means of cryptography. IPsec provides the services of undercoverity, integrity, and authentication. This form of protection does not account for the skilled hacker who may be able to break the encryption method and mystify 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 corky information and pollution. Network is dissipate, even b alignless space information network of people in the rich cultural life, but also to the illegal airing of information or indecent information provided soil British Middlebury Seck Griffith University, professor Di Mulai study found that in non-academic inform ation on the Internet, 47% of filth on These content without restriction for people feel free to browse, not only seriously jeopardize the health of young people, and poison the fond atmosphere and hinder the building of a harmonious society 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 rule 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, demoralise government image or steal business, financial institutions, business information to profit illegally, endangering the economic order or steal personal confid ential 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 knowing complexness, 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 ground on TCP / IP protocol, network devices, operating systems with networking capabilities and openness about t he existence inherent vulnerability In addition, the software in the frame, it is fateful there are some defects or flaws, which has become a prime target for hackers, while software programmers deliberately left the back entre has become a major network security risks network These weaknesses of their own existence, to bring the work of anti-hacker considerable operosey 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 real lack of security methods that can be substantially implemented.There exists a communication gap between 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 model has several advantages when designing networks. It offers modularity, flexibility, ease-of-use, and standardization of protocols. The protocols of different layers can be easily combined to create stacks which allow modular development. The implementation of individual layers can be changed later without making other adjustments, allowing flexibility in development. In contrast to network design, secure network design is not a well-developed process. There isnt a methodology to manage 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 solely network is secure. Network security does not only concern the security in the computers at each end of the communication chain. When transm itting data the communication channel should not be vulnerable to attack. A mathematical hacker could target the communication channel, obtain the data, decrypt it and re-insert a fabricated 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 get over5. Non-repudiation Ensure the user does not refute that he used the networkHere we mainly discuss fake websites.Fake 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 ele ctronic communication. Communications purporting to be from popular social web sites, auction sites, online payment processors or IT administrators are unremarkably 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 uniform to the legitimate one. Phishing is an example of social engineering techniques used to deceive users, and exploits the unfortunate usability of current web security technologies. Attempts to deal with the growing number of account 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 bar. This is done either by placing a point of a legitimate URL over the address bar, or by closing the original address bar and open ing a refreshed 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 scripting) are in particular 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 Fire walls ProtectionA firewall can either be software-based or hardware-based and is used to help keep a network secure. Its native objective is to control the incoming and outgoing network 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 false 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 retrace the decision whether to accept or reject the incoming data packets. 2. covert Network Address (NAT) IP addresses can be used on the internet is a public IP. So to create a node that uses private IP can be translated into public IP. These functions are performed by a firewall, known as NAT. 3. Monitoring and Logging to improve netwo rk 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. secret writing 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 cryptanalytic 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 hugger-mugger Networks (VP N).The most common method of transferring files is using File Transfer Protocol (FTP). A problem with FTP is that the files are sent in slang text, meaning that they are sent unencrypted and therefore 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 populace Wide Web.Hypertext is a multi-linear set of objects, building a network by using logical link (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 chore Force (IETF) and th e World Wide Web Consortium (W3C), culminating in the number of a series of Requests for Comments (RFCs), most notably RFC 2616 (June 1999), which defines HTTP/1.1, the version of HTTP 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 securely 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, individuation and browsing history private.