Combining Anomaly Based Ids And Signature Based Information Technology Essay

Combining Anomaly Based Ids And Signature Based Information Technology Essay Intrusion Detection Systems (IDS) are defined as tools or devices which are used to monitor a system or a machine or a group of users. They try to detect attacks before they take place or after attacks have occurred. IDS collect information from various points in the network to determine of the network is still secure. IDS can be divided into mainly two types: Network Based Host Based. As the name suggest the respective IDS is used for either a Network or an Individual Host. They both have their advantages and dis-advantages and hence are sometimes combined together to provide extra security (Innella, 2001). Working of an IDS An IDS basically can work in two ways:- 1. Anomaly Based 2. Signature Based Anomaly Based IDS (A-IDS) A-IDS can be defined as a system which monitor the activities in a system or network and raise alarms if anything anomalous i.e. other than normal behavior is detected. In any organization profiles are created for all users, wherein each user is given some rights to access some data or hardware. These rules and rights are fed to the A-IDS. If a user is using the computer in a time other than the one allotted to him, the A-IDS raises an alert (Carter, 2002). Carter (2002) GarcÄ ±Ã‚ ´a-Teodoro (2009) have also listed some advantages and dis-advantages of A-IDS. The Advantages are as below:- 1. Inside the network attacks are easily detected by A-IDS. 2. Any user actually abusing his privileges and accessing any other information is easily caught by A-IDS. 3. Zero day attacks can be detected by A-IDS. The Dis-Advantages are:- 1. Appropriate Training is required before it is set up in any environment. 2. It is very difficult to train the IDS in a Normal environment as a Normal Environment is very hard to get. 3. It generates false positives. 4. If the suspicious activity is similar to the normal activity it will not be detected. Signature Based IDS (S-IDS): This type of IDS is also referred as Misuse Detection IDS. It works on the basis of signatures. Each time an attacker attacks a system, he/she tends to leave some footprints of that attack. Footprints can be failed attack logs, failed logins, etcà ¢Ã¢â€š ¬Ã‚ ¦ These are stored as signatures for IDS. It uses a knowledge base, which is a database which stores the previous details of attacks. Whenever it encounters something it matches it with the records in the knowledge base and if a signature matches it raises an alarm (Baumrucker, 2003). Carter(2002) has listed some advantages and dis-advantages to these signature based IDS. Advantages. 1. It can exactly determine the type of attack. 2. It does not produce false positives. 3. It provides an interface which is also easy for a normal user to monitor. Dis-Advantages:- 1. We need to update the knowledge with each and every possible type of attack signature. 2. It is necessary to update the database daily. 3. It cannot detect Zero Day Attacks. 4. An Attack in a database, if they are slightly modified then it is difficult to detect. Hybrid IDS. Goeldenitz (2002) in his paper has written Hybrid IDS seems to be a logical approach for IDS as one IDS can cover the dis-advantages of another type of IDS. It would be achieved by using various IDS together and then can be placed at various points in the networks like gateways, server links, and various junctions. He also explains that this Hybrid IDS is basically installed on a host like a HIDS, but acts like a NIDS. Depran et al (2005) have proposed a Hybrid IDS, which is using KDD 99 dataset. KDD 99 Dataset is a database which is used by researchers for IDS. The model proposed by them for the IDS is below:- This model shows it is integrated with both The Anomaly Detection Module and the Signature (Misuse) Detection Module. It also includes a Decision Support System which will receive input from both the Detection Module and then will decide what to do next. Working Rule: The Rule states if an Attack is detected by any one or both the Detection Systems, then it is termed as an attack. It is termed as Classified Attack if either Signature Based IDS or both have detected the Attack. It is termed as Unclassified Attack if only Anomaly Based IDS has detected the attack. Snort is a IDS which works on Signature Detection. It works on rules, which in turn are based on the signatures usually written by Intruders. (Rehman, 2003). (Aydin et al, 2009) have explained the pre-processor architecture of Snort and the way they have modified snort to reduce the number of false positives. They have used statistical methods such as PHAD NETAD for implementing their anomaly based IDS. The main reasons for choosing PHAD is that rather than modelling behaviour, it models protocols. Also it uses a time-based model for the rapid changes in the network. If a series of same anomaly occur then PHAD flags off only the first anomaly, thus reducing the number of false positives. They have basically combined PHAD NETAD with the pre-processor of Snort. A Pre-processor is an engine which has the ability to read inside the packets and alert based on the content. A Pre-processor can also modify the content of a packet. This was achieved by Aydin et al (2009) by copying just two files spp_phad.c spp_netad.cpp to the folder where snort.c lies, some code written and then the project was compiled to obtain a modified Snort as a Hybrid IDS. This snort was tried in various environments and Fig 3. is one of the graph showing the number of attacks detected by Snort + PHAD + NETAD on a daily basis. DARPA data sets were used to test this Hybrid Snort. It is also clear from the graph that the number of attacks detected by snort alone is way lower than the number of attacks detected by the Hybrid Snort. Hence (Aydin et al) also conclude that combining PHAD NETAD which are Anomaly Based IDS and Siganture Based IDS has more positive results and has contributed successfully. Future Work Depren et al (2005) have proposed that different ways can be proposed to implement Anomalous Based IDS and Signature Based IDS. They have also proposed that for AIDS, it would be better to classify the attack based on the network services and then write better rules for analyzing them with less attributes. Also Endorf et al (2003) have written in their book, target detection which has proved to be one of the best reliable and robust methods for Intrusion Detection. They also say that attackers although may be able to evade a signature based IDS, but they cannot bypass target detection which uses strong cryptographic algorithms and uses strong authentication to access the target functions. Commercial tools such as Tripwire, Intruder Alert, ForixNT, etc,à ¢Ã¢â€š ¬Ã‚ ¦ are used by big companies, but are not so widely used by small companies due to price limitations. There are also chances that some Operating Systems might incorporate tools like these so one doesnt have to depend on ext ernal tools.

Discuss the Importance of Visual Perception Essay

Sexual development is an important personal characteristic that contributes to ones self-worth. It is the way one sees him or her independent of one’s anatomic appearance. The way one feels and the way one is acknowledged by society and the environment can make the difference between being happy or unhappy. Whether or not one’s choice is accepted by others can also influence how one lives. Unfortunately, sexual development is often confused because it is most often assumed to agree with one’s appearance. Very often, it does but sometimes it differs. Simply because something seems or is supposed to be a certain way due to one’s societal expectations, does not mean that it always will be. Things are not always the way they appear and it takes much greater knowledge and understanding to accept people for what they are, even if it does not go along with what one learned. Keywords: Gender, male and female, hormones, environment Sexual Development Everyone possesses a gender identity, which most often matches one’s anatomic appearance. One’s sexual development can be either male or female or even something in between. Is sexual development truly so important or does it not play that significant of a role? Maybe this example will help everyone come to a better conclusion about this subject. A healthy baby boy was born to very happy parents. However, about eight months into his life, something happened and his genitals were horrifically destroyed. His biggest male appearance at that age, his penis, did not exist anymore. His parents, completely disturbed by the accident, heard about a psychologist who was able to assign sex to children whose genitals were destroyed or not there for another reason. According to Culbertson (2009), â€Å"If it is not created, then the child will be assigned a grammatical gender (in the Western world, all children must be either a boy or a girl), which may or may not match that childà ¢â‚¬â„¢s social gender as it evolves over the course of childhood† (para. 14). Very often, when a parent chooses the sex for his or her own child due to the circumstances, it seems to work very well. However, prenatal hormones also influence these factors in either working or not. Nevertheless, it did not work in this case and this boy began to live  an unhappy life as a girl. Time went by and many problems occurred until she saw another psychologist. Her parents finally told her what happened and she began the transformation into a male. It seems like being a male made him happier once again and he even married and became a stepfather. However, this story does not have a successful conclusion, as David Reimer committed suicide at the age of 38 (New York Times, 2004). This tragic story shows that one’s sexual development matters. It also explains that there is more than one factor that contributes to one’s sexual development. Therefore, the author of this paper will try to provide a better understanding into how gender identity and sexual development happens. The interaction between hormones and behavior will be explained and what role it plays in finding his or her own gender indentify in sexual development. As usual, it will also use the help of biopsychology and the environment to provide a better answer for the reader. The author hopes that the reader will not only establish a deeper knowledge about this subject but mostly that he or she will walk away with more understanding for individualism. Determination of Sexual Development Many different factors come into play determining one’s final sexual development. It is very important to acknowledge that not everything that appears a certain way also will perform as such. One’s anatomy might indicate being a male or female; however, this does not mean that this is actually how a person views him or herself. Chromosomes play a very important role in developing sexual organs. Sexual chromosomes, such as XX and XY, help determine sexual differentiation. For instance, XX chromosomes will lead to the development of a female while XY chromosomes develop a male. In addition, the sexual X chromosome and non-sexual chromosomes can do more and possess the ability of developing either sexual genitals. This is why the exposure to hormones before and after one is born is so significant. Hormones are responsible for one’s biological development. Therefore, it is very interesting to find out that the Y chromosome directs the glands to releases male sex hormones. Furthermore, hormones present during pregnancy will most likely affect the nervous system. It is important to acknowledge that every embryo is bisexual and has the ability to develop into a male or female until the end of the first trimester and  the ability of hormones, which will the determine the kind of system, the Mà ¼llerian system or Wolffian system, one develops (Carlson, 2007). It is clear that hormones influence sexual development and help one to not only view him or her as male or female but also feel as such. For instance, hormones also influence feminine and masculine characteristics. As stated by Berk (2004), â€Å"Masculine and androgynous children and adults have higher self-esteem, whereas feminine individuals often think poorly of themselves, perhaps because many of their traits are not highly valued by society†(p. 263). Children and Sexual Development One is not born knowing everything about him or herself. The way one is brought up, the environment, and different beliefs, just to mention few, all help one come to that conclusion. Children are not born with the knowledge of what his or her anatomy and gender identity is; they learn it at a certain age. To be even more exact and according to Rathus, Nevid, & Fichner-Rathus (2008) â€Å"Most children first become aware of their anatomic sex by about the age of 18 months. By 36 months, most children have acquired a firm sense of gender identity† (p.167). Therefore, one’s social learning and cognitive development also affect gender identity and sexual development. Children are influenced first by their parents and then by other authorities, peers and even the media. Another very important theory that should be considered in how one comes to their gender identity is the gender schema theory. This theory knows the strong influence one’s cognitive development and the environment play together. This happens by setting either masculine or feminine categories with which one can identify more. So for instance, boys play only with specific toys and girls do the same. Either gender is criticized by not following these rules or these rules are even pre-set by others. Parents buy gender specific toys and stores even categorize their sections by age and gender. These examples show how much other factors help one choose his and her gender identity and therefore influence one’s sexual development (Berk, 2004, p. 263). Still, even though one’s appearance normally goes along with one’s preference, there are times when this does not happen. Maybe this is one of the reasons why it takes so many to open up and let everyone know how he or she truly  feels. This may also be one of the reasons why so many never say anything and hurt themselves or even end their lives. This is why it is especially important for parents and other authorities’ roles to avoid stereotyping and allow the possibility of acceptance even if it does not go alone with one’s thin king and the social agreement. Furthermore, this can be explained by examining the behavior of intersexuals. Intersexuals’ gonads differ from their sexual appearance yet they are brought up by how they look. However, many express difficulty indentifying with being either male or female. This provides the clear evidence of the interplay of biological factors and the environment contributing to one’s sexual development (Rathus, Nevid, & Fichner-Rathus, 2008). However, indentifying with either one seems to be important. Quoted by Gross: Both males and females reported that gendered expectations at home involved educational success. For females, gendered expectations at school involved being interested in fashion and boys. For males, gendered expectations at school involved being interested in girls and participating in non-academic activities like sport (Gross, 2009). Biological Psychology Biological psychology plays an important role and considers different factors when explaining what and how sexual differentiation and sexual development is determine. It acknowledges that a person’s brain influences one’s behavior; this behavior resembles male or female characteristics and will be categorized as such. However, biological psychology also knows that it is not so simple explaining a human and there are many other important aspects in one’s life, which cause certain things to occur. Therefore, not only the brain but also, hormones, heredity, the environment, cultural upbringing, and one’s choices will determine either a traditional or a non-traditional role with which one can better identify. Determination of Greater Influence As everyone differs from each other, so too differ each individual’s influence. For instance, someone could have been exposed to prenatal hormones that normally would determine how one turns out to be, but then they were prone to the influences of his or her environment and turned out completely opposite. Therefore, saying which has the greater contribution  is a difficult decision to make. There is evidence for both such as, being raised as a male and resembling one should surely let one know that is how they should feel. That does not happen all the time. If the answer would be so clear, then one should be able to know what causes female homosexuals to have higher levels of testosterone, as human biology or a certain lifestyle can increase the level. This is why it is, most likely, the interplay of both that contribute to this occurrence, leading to uncertainty of the main cause. Conclusion One’s looks do not indicate how one feels and certain important factors contribute to one’s sexual differentiation, gender identity, and sexual development. Surely, it matters to try to find the correct answers because they may provide more understanding to human nature. So maybe one day, much clearer resolutions can be provided. However, in the mean time, one should always keep in mind that every individual tries to be his or her best and to be acknowledged is what, in the end, counts and makes a truly good person. One way of doing so is â€Å"by making it illegal to discriminate in employment, public accommodation, credit, housing and education based on a person’s sexual orientation or gender identity†( Journal of Property Management, 2007).

Surprising Facts About Good Short Essay Samples Exposed

Surprising Facts About Good Short Essay Samples Exposed Up in Arms About Good Short Essay Samples? In the event you're indecisive to pay a person to compose your essay, explore other facets of our websites or contact our support team for any extra guidelines. Question marks go outside the last quotation mark in the event the full sentence asks the question. As a consequence, you get a good deal of free time and completed homework. Being part of a decent educational institution can be very costly. Don't forget to begin your essay strongit should have the capacity to spark the interests of your readers. Students have to compose essays based on the teacher's instructions or their preferred style in writing. In that circumstance it is known as a college admission essay. You want to understand how to compose an effective essay as it is a typical foundation for a student's grade. Students often complain about a specific kind of essay they've been assigned with. Synthesis essays are about the masterful handling of a couple of sources to strengthen your thesis. If you are able to, read a number of the papers twice. Facts, Fiction and Good Short Essay Samples Deciding upon a topic, be sure to pick a narrow concrete topic, since if the topic isn't limited, it isn't simple to make a decision as to what questions and facets of the problem to analyze. The second sentence gives vivid details to produce the reader feel like he's there. Should you want, read an instance of a superior answer and contrast it using a bad answer you created. The topic of the sentence should always be expressed. Narrative Essays If you're not quite certain what a particular type of essay is, just have a look during its name. To compose an impressive short essay, especially during an examination, you should be in a position to hit the question and supply a straightforward answer while at the very same time observing the most suitable structure of an essay. An ess ay outline can help you organize the total structure of your essay. You need to remember the appropriate structure of an ordinary essay. The huge difference between a lengthier essay and a quick essay is merely thatthe length. Regardless of what's the aim of your essay, there's a preset number of points which you will be expected to handle. Although there are a number of methods to compose an essay, there's a simple outline to follow for success each time. There are quite a lot of methods to compose an essay so you'll hardly locate an all-included recipe for a great many essay occasions. To have a high score on your IELTS essay, you want to understand what an excellent essay is made up of. A great essay is one which leaves an enduring impression. Short essays are still spend the type of formal essay because the parts will need to get included in it. Of all Of the kinds of essay, writing a quick essay may appear to be the easiest. Such a quick form also provides you certain benefits, ever since your story can be published in a variety of magazines, anthologies devoted to a particular topic, or on different internet sites. You ought to pick the subject of your essay by paying attention to the kind of reader and your major targets. The simplest way to influence the sort of an essay is to realize the writer's point of view. Bridget's essay is extremely strong, but there continue to be a couple little things that could be made better. Ultimately, however, remember that fantastic writing doesn't happen by accident. If you take a look at descriptive essays from a different perspective, you will see them very much like everyday news reports. Before you commence writing the core of your story, we recommend you to contemplate where you're likely to publish it. There's great news if you aren't a wonderful writer because we can provide help. A Startling Fact about Good Short Essay Samples Uncovered Thus, our primary feature is to supply quality stories. You may use the samples as a foundation for working out how to write in the right style. Do not be hesitant to use different professional samples to be sure you're on the appropriate way.

What Was the Role of Perseus in Greek Mythology

Perseus is a major hero from Greek mythology best known for his clever decapitation of Medusa, the monster who turned all who looked at her face into stone. He also rescued Andromeda from the sea monster. Like most of the mythological heroes, the genealogy of Perseus makes him the son of a god and a mortal. Perseus is the legendary founder of the Peloponnesian  city of Mycenae, home of Agamemnon, the leader of the Greek forces in the Trojan War, and the father of the legendary ancestor of the Persians, Perses. Family of Perseus The mother of Perseus was Danae, whose father was Acrisius of Argos. Danae conceived Perseus when Zeus, taking the form of a golden shower, impregnated her. Electryon is one of Perseuss sons. Electryons daughter was Alcmena, Hercules mother. The other sons of Perseus and Andromeda are Perses, Alcaeus, Heleus, Mestor, and Sthenelus. They had one daughter, Gorgophone. Infancy of Perseus An oracle told Acrisius that a child of his daughter Danae would kill him, so Acrisius did what he could to keep Danae from men, but he couldnt keep out Zeus and his ability to shift into different forms. After Danae gave birth, Acrisius sent her and her son away by locking them in a chest and putting it to sea. The chest washed up on the island of Seriphus which was ruled by Polydectes. The Trials of Perseus Polydectes, who was trying to woo Danae, thought Perseus a nuisance, so he sent Perseus on an impossible quest: to bring back the head of Medusa. With the help of Athena and Hermes, a polished shield for a mirror, and some other useful items the one-shared-eyed Graeae helped him locate, Perseus was able to cut off the head of Medusa without being turned to stone. He then enclosed the severed head in a sack or wallet. Perseus and Andromeda On his travels, Perseus fell in love with a maiden named Andromeda who was paying for the boasts of her family (like Psyche in Apuleiuss Golden Ass) by being exposed to a sea monster. Perseus agreed to kill the monster if he could marry Andromeda, with some predictable obstacles to overcome. Perseus Returns Home When Perseus came home he found King Polydectes behaving badly, so he showed the king the very prize he had asked Perseus to fetch, the head of Medusa. Polydectes turned to stone. The End of the Medusa Head The Medusa head was a powerful weapon, but Perseus was willing to give it up to Athena, who placed it in the center of her shield. Perseus Fulfills the Oracle Perseus then went to Argos and Larissa to compete in athletic events. There, he accidentally killed his Grandfather Acrisius when a wind swept away a discus he was holding. Perseus then went to Argos to claim his inheritance. Local Hero Since Perseus had killed his grandfather, he felt bad about reigning in his stead, so he went to the Tiryns where he found the ruler, Megapenthes, willing to exchange kingdoms. Megapenthes took Argos, and Perseus, Tiryns. Later Perseus founded the nearby city of Mycenae, which is in the Argolis  in the Peloponnese. Death of Perseus Another Megapenthes killed Perseus. This Megapenthes was a son of Proteus and a half-brother of Perseus. After his death, Perseus was made immortal and put among the stars. Today, Perseus is still the name of a constellation in the northern sky. Perseus and His Descendants The Perseids, a term referring to the descendants of Perseus and Andromedas son Perses, is also the name of a summer meteor shower that comes from the constellation of Perseus. Among the human Perseids, the most famous is Hercules (Heracles). Source Parada, Carlos. Perseus. Greek Mythology Link.