Evading Intrusion Detection Systems Essay Example for Free

Evading Intrusion Detection Systems Essay As information technology advances its demand and reliance has increase has increased resulting in numerous growths in development and usage of web site. This technology has resulted to be very beneficial to organizational and institutional prosperity for example world of business has benefited a lot from the so called e-commerce. These benefits have on the other hand attracted exploitation of the web site supporting them. Growth in occurrence of exploitation of data sites which handle crucial organizational information have resulted to a major concern over their security and management of risks associated. This concern has resulted to usage of prevention system such as â€Å"Web Application Firewall, intrusion prevention systems and intrusion detection systems† (Vittie, 2007 pp. 1). Intrusions detection systems are protective systems which detect identify and isolate exploitation of computer systems. According to Newsham 1998, intrusion detection is a vital element of computer systems security system which complements other protection machineries. â€Å"By providing information to site administration, ID allows not only for the detection of attacks explicitly addressed by other security components (such as firewalls and services wrappers) but also attempts to provide notification of new attacks unforeseen by other components† (Newsham, 1998 para. 3). They are also very important as they provide organization with forensic information enabling detection of origination of attacks. This can help in following of attackers and make the answerable for their malicious actions. Working of Intrusion Detective Systems (IDS) is geared toward monitoring network of any attackers. In this operation it is hindered by network skilled attackers who are working day and night to be able to counter these systems and continue with their malicious damages. Exploitation in this case can continue in case where IDS may be short of complete scrutiny for the all of behavior perpetuated by a certain protocol. A good example to this is a case where attacker of IDS that is unable to reassemble Internet Protocol (IP) fragment through deliberate â€Å"†¦transmission of attack traffic in fragments rather than complete IP datagrams† (Kreibich, 2001). Internet Protocol end systems are assumed to conduct fragment reassembly and incase of this scenario, the attacker may accomplish intended mission without being noticed by IDS since it may be unable to reconstruct entire datagrams. Evading Intrusion Detection Systems using fragmentation and small packet technique can be said to be an evasion technique designed to confuse detection by IDS. Operations of fragment and small packet are based on ensuring attack payload splits into numerous small packets making IDS to gather the packet steam so as to identify the attack. This is possible through fragmenting the small packets but making of packets with minute payload can as well function. Although the small packet may a not evade any IDS which looks like packet steams, they can be designed to confuse reassembly as well as detection. Following deployment of IDS in 90s evasion, discovery of evasion followed. Evasion this time was â€Å"segmenting a signature into multiple packets, sometimes delaying second part of signature to trigger a network IDS time-out† (Gorton Champion, n. d. pp 2). Since 1997, several way of evading IDS which largely depended on using UNIX command shell potentialities. Later, hackers were able to use shell evasion design for example â€Å"mimicking ROT-13 ‘encryption’ using the TR command† (Gorton Champion, n. d. pp 2). Overlapping fragments has also been in use in that numerous packets with Internet Protocol or Transmission Control Protocol modified to overlap. Protocol violation uses similar technique as overlapping fragment in attempt to evade IDS through deliberate violation of Internet Protocol. Other evading Intrusion Detection Systems are Denial of Service and Inserting Traffic at the Intrusion Detection Systems. The inserted traffics are modified packet which are identified by IDS by computer may not detects becoming the main target. While Denial Service is a system modified to evade detection through overpowering Intrusion Detection System. This is possible through exploiting attacking element by use of large codification. â€Å"In 1999, Ptacek and Newsham demonstrated that commercial Intrusion detection systems had fundamentals flaws at handling the IP and TCP protocols which allowed attacker to trick them into incorrectly reconstructing sessions containing an attack† (Gorton Champion, n. d. pp 4). These two researchers in this field identified that several ways which IDS could not be able to detect invasion through being tricked and lack to attack invasion capable to detect. This was followed by development of programs by Dug Song guided by techniques explained by Ptacek and Newsham. This program is called fragrouter and later developed to fragroute. Attack of server through Hypertext Transfer Protocol (HTTP), â€Å"†¦there are fewer possibility for application evasion than in shell version. If the signature is flawed, an attacker can alter non-essential parts of the attack and avoid the signature,† (Gorton Champion, n. d. pp 4). To counter this inefficiency other forms of IDS were developed these are Mendax and Whisker written by Kang’s and Puppy respectively. In conclusion, evading Intrusion Detective System is still an active field. As ways to counter their malicious behaviors are developed hackers are busy advancing their attacks. This means future and survival of IDS in protecting web site is dependent to continued research in this field. Reference: Vittie, Lori Mac (2007): XSS Evasion—Trying to hide in the all-concealing torchlight; Retrieved on 12th December 2008 from; http://www. f5. com/pdf/white-papers/xss-evasion-wp. pdf Newsham Timothy N. (1998): Insertion, Evasion, and Denial of Service: Eluding Network Intrusion Detection. Retrieved on 12th December 2008 from; http://insecure. org/stf/secnet_ids/secnet_ids. html. Kreibich, Christian (2001): Network Intrusion Detection: Evasion, Traffic Normalization, and End-to-End Protocol Semantics. Retrieved on 12th December 2008 from; http://www. icir. org/vern/papers/norm-usenix-sec-01. pdf Gorton A. Samuel Champion Terrence G. (n. d): Combining Evasion Techniques to Avoid Network Intrusion Detection Systems. Retrieved on 12th December 2008 from; http://www. skaion. com/research/tgc-rsd-raid. pdf

Free Bluest Eye Essays - Learning to Hate :: Bluest Eye Essays

The Bluest Eye - Learning to Hate Many American's today are not satisfied with their physical appearance. They do not feel that they are as beautiful as the women on television or in magazines. The media is brainwashing American females that if they are not slim and have blonde hair and blue eyes, they are not beautiful. This causes women not only to hate the ideal females, but also hate themselves. In Toni Morrison's novel The Bluest Eye two of her main characters, Claudia and Pecola show hatred toward others, and themselves because they are not as beautiful as the supreme females. Claudia's hatred starts at the beginning of the novel when she and her sister are staring at Rosemary Villanucci. Rosemary has what Claudia and Frieda want. They want the things that white people have. "We stare at her, wanting her bread, but more than that wanting to poke the arrogance out of her eyes and smash the pride of ownership that curls her chewing mouth."(Morrison, p.9) Claudia and Frieda hate Rosemary because she has all of the things that Claudia and Frieda will never have or be, particularly Rosemary's white skin. This forces a feeling of self-hatred for being black upon the girls. You can see Claudia's hatred again when she receives a white baby doll for Christmas. Instead of adoring and cradling the new gift, as most other children would have done, she mutilated and destroyed the doll. "Adults, older girls, shops, magazines, newspapers, window sign - all the world had agreed that a blue-eyed, yellow-haired, pink-skinned doll was what every girl child treasured. `Here,' they said, 'this is beautiful, and if you are on this day `worthy' you may have it.'" (Morrison p. 20-21) She hated the doll's blonde hair and blue eyes staring back at her, reminding her of how different she looked from the doll. She knew that she was wrong for destroying the doll, but she could not refrain herself from doing it. The doll, symbolized the perfect girl, and she knew she was very far from looking like her. In Emily Prager's essay "Our Barbies, Ourselves", she "reveals the damaging effect of a doll that establishes such an impossible standard of physical perfection for little girls.

Intercultural communication Essay

The power distance refers to the closeness, or lack thereof, between a person of authority and his or her subordinates. Those that hold the power of authority, that is those people who can bring about a change of some type, are also, many times, those who present with some type of symbol of their authority when attending a meeting, or otherwise on display. For example, in an Arabic country, a person in authority might wear a richly decorated robe and head covering while those in subordinate roles might be dressed in a less elaborate robe and plain head covering or a suit. The language one uses also denotes their position of authority. For example, a person in authority in a more democratic and informal society would usually address a subordinate by his or her given first name instead of using a salutation such as Mr or Ms along with the person’s last name as would be the case in a more formal, less democratic culture. In addition, there is ample body language displayed both by the person in authority and by those whose are not in authority. A person of authority will usually command a presence in a room by presenting oneself in the front and center of a group of people. Subordinates to the person in power will flank that person by standing back away and behind the person in authority. Indeed, depending on the culture of the person in authority, that person will either talk to their subordinates in an aloof way that can seem to be almost rude to someone that is unused to it. The countries that demand this sort of communication include those located in the Arab speaking areas of the world, as well as Russia and China. In other cultures, such as those found in Australia, Canada, and Japan, there is more of an egalitarian mood to the interactions between a person with the power of authority and their subordinates. This is characterized by mutual respect between both parties that is not found in those more conservative countries.

Really Funny Quotes From Famous People

There are funny quotes and then there are funny quotes. Some really make you guffaw, while others rarely make your lips curl in mirth. Truly, there are only a few award-winning fun quotes that make you laugh over and over again. Here are a few really funny quotes that are different from the others and have stood the test of time. Colonel Sanders Theres no reason to be the richest man in the cemetery. You cant do any business from there. Roseanne Barr Experts say you should never hit your children in anger. When is a good time? When youre feeling festive? W.C. Fields I am free of all prejudices. I hate everyone equally. Milton Berle Theyve finally come up with the perfect office computer. If it makes a mistake, it blames another computer. George Gobel If it werent for electricity wed all be watching television by candlelight. Groucho Marx I find television very educating. Every time somebody turns on the set, I go into the other room and read a book. Voltaire It is dangerous to be right when the government is wrong. Oscar Wilde By persistently remaining single a man converts himself into a permanent public temptation. Ellen DeGeneres My grandmother started walking five miles a day when she was sixty. Shes ninety-seven now, and we dont know where the hell she is. Tommy Cooper You know, somebody actually complimented me on my driving today. They left a little note on the windscreen, it said Parking Fine. Oscar Levant Roses are red, violets are blue, Im schizophrenic, and so am I. Flip Wilson If you think nobody cares if youre alive, try missing a couple of car payments. Joey Adams If it werent for the fact that the TV set and the refrigerator are so far apart, some of us wouldnt get any exercise at all. Mike Myers My theory is that all of Scottish cuisine is based on a dare. Emo Philips I was walking down Fifth Avenue today and I found a wallet, and I was gonna keep it, rather than return it, but I thought:  well, if I lost a hundred and fifty dollars, how would I feel? And I realized I would want to be taught a lesson. Steven Wright If at  first, you dont succeed, then skydiving definitely isnt for you. Robin Williams Why do they call it rush hour when nothing moves? Jerry Seinfeld There is no such thing as fun for the whole family. Joan Rivers I knew I was an unwanted baby when I saw that my bath toys were a toaster and a radio. Larry David When youre not concerned with succeeding, you can work with complete freedom. Lewis Black Do you know what meteorologist means in English? It means liar. Mae West When Im good, Im very good. But when Im bad Im better. Alice Roosevelt Longworth If you havent got anything nice to say about anybody, come sit next to me.