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Explained! Intrusion Detection Systems
Explained! Intrusion Detection Systems
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Intrusion Detection and Prevention Systems - CompTIA Network+ N10-006 - 1.1
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Intrusion Detection System Introduction, Types of Intruders in Hindi with Example
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How does Intrusion Prevention Systems work?
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Intrusion Detection (IDS) Best Practices
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Introduction to Intrusion Detection
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Describe IDS, IPS, and HIDS
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IDS - Intrusion Detection System
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Channel: ISO Training Institute
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Computer and Network Security - Intrusion Detection Systems
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IDS - Intrusion Detection Systems (CISSP Free by Skillset.com)
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Intrusion Detection System Tutorial: Setup Security Onion
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Intrusion Detection and Prevention Systems (IDS/IPS): Computer Security Lectures 2014/15 S1
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Raspberry Pi Wireless Intrusion Detection Systems
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Home Intrusion Detection System
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Attacks in a Network Intrusion Detection System on Artificial Neural Networks (ANN Backup)
Published: 2014/10/04
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Intrusion Detection System Audit Records, Native and Detection Specific Audit Records(Hindi)
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Channel: Easy Engineering Classes
Java Projects with Source Code - Intrusion Detection System in Web Application
Java Projects with Source Code - Intrusion Detection System in Web Application
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Published: 2016/10/10
Channel: Quick Notepad Tutorial
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Published: 2016/06/06
Channel: Udacity
Central: Module 7 – Wireless Intrusion Detection System (IDS)/Intrusion Protection System (IPS)
Central: Module 7 – Wireless Intrusion Detection System (IDS)/Intrusion Protection System (IPS)
Published: 2016/09/28
Channel: Aruba, a Hewlett Packard Enterprise company
Components of Intrusion Detection Systems
Components of Intrusion Detection Systems
Published: 2016/06/06
Channel: Udacity
Intrusion Detection (IDS) Best Practices
Intrusion Detection (IDS) Best Practices
Published: 2015/11/24
Channel: AlienVault
JAVA 2012 IEEE Project A Secure Intrusion detection system against DDOS attack in Wireless
JAVA 2012 IEEE Project A Secure Intrusion detection system against DDOS attack in Wireless
Published: 2013/02/15
Channel: LT LIOTechprojects
Signature Based  Intrusion Detection System Network Security Projects
Signature Based Intrusion Detection System Network Security Projects
Published: 2017/03/16
Channel: NS2 Project
Host-based Intrusion Detection Systems
Host-based Intrusion Detection Systems
Published: 2014/08/26
Channel: Introduction to Digital Forensics
An Introduction to Network Intrusion Detection Systems
An Introduction to Network Intrusion Detection Systems
Published: 2010/07/23
Channel: certifiedCOMSEC
CCNPS | IPS | 01- Intrusion Prevention and Intrusion Detection Systems (Eng.Ahmed Sultan)
CCNPS | IPS | 01- Intrusion Prevention and Intrusion Detection Systems (Eng.Ahmed Sultan)
Published: 2013/12/28
Channel: EgyptNetRiders
Intrusion Detection Systems (ITS335, Lecture 16, 2013)
Intrusion Detection Systems (ITS335, Lecture 16, 2013)
Published: 2014/01/28
Channel: Steven Gordon
INTRUSION DETECTION SYSTEM FOR GRID AND CLOUD COMPUTING
INTRUSION DETECTION SYSTEM FOR GRID AND CLOUD COMPUTING
Published: 2014/03/08
Channel: Susmay FOURGREENSOFT
Host-based Intrusion Detection System
Host-based Intrusion Detection System
Published: 2015/01/23
Channel: UnitedLayer
Detection Technologies Intrusion Detection Systems
Detection Technologies Intrusion Detection Systems
Published: 2009/12/11
Channel: detectiontechnology
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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An intrusion detection system (IDS) is a device or software application that monitors a network or systems for malicious activity or policy violations. Any detected activity or violation is typically reported either to an administrator or collected centrally using a security information and event management (SIEM) system. A SIEM system combines outputs from multiple sources, and uses alarm filtering techniques to distinguish malicious activity from false alarms.

There is a wide spectrum of IDS, varying from antivirus software to hierarchical systems that monitor the traffic of an entire backbone network.[citation needed] The most common classifications are network intrusion detection systems (NIDS) and host-based intrusion detection systems (HIDS). A system that monitors important operating system files is an example of a HIDS, while a system that analyzes incoming network traffic is an example of a NIDS. It is also possible to classify IDS by detection approach: the most well-known variants are signature-based detection (recognizing bad patterns, such as malware) and anomaly-based detection (detecting deviations from a model of "good" traffic, which often relies on machine learning). Some IDS have the ability to respond to detected intrusions. Systems with response capabilities are typically referred to as an intrusion prevention system.

Comparison with firewalls[edit]

Though they both relate to network security, an IDS differs from a firewall in that a firewall looks outwardly for intrusions in order to stop them from happening. Firewalls limit access between networks to prevent intrusion and do not signal an attack from inside the network. An IDS evaluates a suspected intrusion once it has taken place and signals an alarm. An IDS also watches for attacks that originate from within a system. This is traditionally achieved by examining network communications, identifying heuristics and patterns (often known as signatures) of common computer attacks, and taking action to alert operators. A system that terminates connections is called an intrusion prevention system, and is another form of an application layer firewall.

Intrusion detection[edit]

IDS can be classified by where detection takes place (network or host) and the detection method that is employed.

Analyzed activity[edit]

Network intrusion detection systems[edit]

Network intrusion detection systems (NIDS) are placed at a strategic point or points within the network to monitor traffic to and from all devices on the network. It performs an analysis of passing traffic on the entire subnet, and matches the traffic that is passed on the subnets to the library of known attacks. Once an attack is identified, or abnormal behavior is sensed, the alert can be sent to the administrator. An example of an NIDS would be installing it on the subnet where firewalls are located in order to see if someone is trying to break into the firewall. Ideally one would scan all inbound and outbound traffic, however doing so might create a bottleneck that would impair the overall speed of the network. OPNET and NetSim are commonly used tools for simulation network intrusion detection systems. NID Systems are also capable of comparing signatures for similar packets to link and drop harmful detected packets which have a signature matching the records in the NIDS. When we classify the design of the NIDS according to the system interactivity property, there are two types: on-line and off-line NIDS, often referred to as inline and tap mode, respectively. On-line NIDS deals with the network in real time. It analyses the Ethernet packets and applies some rules, to decide if it is an attack or not. Off-line NIDS deals with stored data and passes it through some processes to decide if it is an attack or not.[1]

Host intrusion detection systems[edit]

Host intrusion detection systems (HIDS) run on individual hosts or devices on the network. A HIDS monitors the inbound and outbound packets from the device only and will alert the user or administrator if suspicious activity is detected. It takes a snapshot of existing system files and matches it to the previous snapshot. If the critical system files were modified or deleted, an alert is sent to the administrator to investigate. An example of HIDS usage can be seen on mission critical machines, which are not expected to change their configurations.

Intrusion detection systems can also be system-specific using custom tools and honeypots.

Detection method[edit]

Signature-based[edit]

Signature-based IDS refers to the detection of attacks by looking for specific patterns, such as byte sequences in network traffic, or known malicious instruction sequences used by malware.[2] This terminology originates from anti-virus software, which refers to these detected patterns as signatures. Although signature-based IDS can easily detect known attacks, it is impossible to detect new attacks, for which no pattern is available.

Anomaly-based[edit]

Anomaly-based intrusion detection systems were primarily introduced to detect unknown attacks, in part due to the rapid development of malware. The basic approach is to use machine learning to create a model of trustworthy activity, and then compare new behavior against this model. Although this approach enables the detection of previously unknown attacks, it may suffer from false positives: previously unknown legitimate activity may also be classified as malicious.

New types of what could be called anomaly-based intrusion detection systems are being viewed by Gartner as User and Entity Behavior Analytics (UEBA)[3] (an evolution of the user behavior analytics category) and network traffic analysis (NTA).[4] In particular, NTA deals with malicious insiders as well as targeted external attacks that have compromised a user machine or account. Gartner has noted that some organizations have opted for NTA over more traditional IDS.[5]

Intrusion prevention[edit]

Some systems may attempt to stop an intrusion attempt but this is neither required nor expected of a monitoring system. Intrusion detection and prevention systems (IDPS) are primarily focused on identifying possible incidents, logging information about them, and reporting attempts. In addition, organizations use IDPSes for other purposes, such as identifying problems with security policies, documenting existing threats and deterring individuals from violating security policies. IDPSes have become a necessary addition to the security infrastructure of nearly every organization.[6]

IDPSes typically record information related to observed events, notify security administrators of important observed events and produce reports. Many IDPSes can also respond to a detected threat by attempting to prevent it from succeeding. They use several response techniques, which involve the IDPS stopping the attack itself, changing the security environment (e.g. reconfiguring a firewall) or changing the attack's content.[6]

Intrusion prevention systems (IPS), also known as intrusion detection and prevention systems (IDPS), are network security appliances that monitor network or system activities for malicious activity. The main functions of intrusion prevention systems are to identify malicious activity, log information about this activity, report it and attempt to block or stop it.[7].

Intrusion prevention systems are considered extensions of intrusion detection systems because they both monitor network traffic and/or system activities for malicious activity. The main differences are, unlike intrusion detection systems, intrusion prevention systems are placed in-line and are able to actively prevent or block intrusions that are detected.[8]:273[9]:289 IPS can take such actions as sending an alarm, dropping detected malicious packets, resetting a connection or blocking traffic from the offending IP address.[10] An IPS also can correct cyclic redundancy check (CRC) errors, defragment packet streams, mitigate TCP sequencing issues, and clean up unwanted transport and network layer options.[8]:278[11].

Classification[edit]

Intrusion prevention systems can be classified into four different types:[7][12]

  1. Network-based intrusion prevention system (NIPS): monitors the entire network for suspicious traffic by analyzing protocol activity.
  2. Wireless intrusion prevention systems (WIPS): monitor a wireless network for suspicious traffic by analyzing wireless networking protocols.
  3. Network behavior analysis (NBA): examines network traffic to identify threats that generate unusual traffic flows, such as distributed denial of service (DDoS) attacks, certain forms of malware and policy violations.
  4. Host-based intrusion prevention system (HIPS): an installed software package which monitors a single host for suspicious activity by analyzing events occurring within that host.

Detection methods[edit]

The majority of intrusion prevention systems utilize one of three detection methods: signature-based, statistical anomaly-based, and stateful protocol analysis.[9]:301[13]

  1. Signature-Based Detection: Signature based IDS monitors packets in the Network and compares with pre-configured and pre-determined attack patterns known as signatures.
  2. Statistical anomaly-based detection: An IDS which is anomaly based will monitor network traffic and compare it against an established baseline. The baseline will identify what is "normal" for that network – what sort of bandwidth is generally used and what protocols are used. It may however, raise a False Positive alarm for legitimate use of bandwidth if the baselines are not intelligently configured.[14]
  3. Stateful Protocol Analysis Detection: This method identifies deviations of protocol states by comparing observed events with "predetermined profiles of generally accepted definitions of benign activity".[9]

Limitations[edit]

  • Noise can severely limit an intrusion detection system's effectiveness. Bad packets generated from software bugs, corrupt DNS data, and local packets that escaped can create a significantly high false-alarm rate.[15]
  • It is not uncommon for the number of real attacks to be far below the number of false-alarms. Number of real attacks is often so far below the number of false-alarms that the real attacks are often missed and ignored.[15][needs update]
  • Many attacks are geared for specific versions of software that are usually outdated. A constantly changing library of signatures is needed to mitigate threats. Outdated signature databases can leave the IDS vulnerable to newer strategies.[15]
  • For signature-based IDSes there will be lag between a new threat discovery and its signature being applied to the IDS. During this lag time the IDS will be unable to identify the threat.[14]
  • It cannot compensate for a weak identification and authentication mechanisms or for weaknesses in network protocols. When an attacker gains access due to weak authentication mechanism then IDS cannot prevent the adversary from any malpractice.
  • Encrypted packets are not processed by most intrusion detection devices. Therefore, the encrypted packet can allow an intrusion to the network that is undiscovered until more significant network intrusions have occurred.
  • Intrusion detection software provides information based on the network address that is associated with the IP packet that is sent into the network. This is beneficial if the network address contained in the IP packet is accurate. However, the address that is contained in the IP packet could be faked or scrambled.
  • Due to the nature of NIDS systems, and the need for them to analyse protocols as they are captured, NIDS systems can be susceptible to same protocol based attacks that network hosts may be vulnerable. Invalid data and TCP/IP stack attacks may cause an NIDS to crash.[16]

Evasion techniques[edit]

There are a number of techniques which attackers are using, the following are considered 'simple' measures which can be taken to evade IDS:

  • Fragmentation: by sending fragmented packets, the attacker will be under the radar and can easily bypass the detection system's ability to detect the attack signature.
  • Avoiding defaults: The TCP port utilised by a protocol does not always provide an indication to the protocol which is being transported. For example, an IDS may expect to detect a trojan on port 12345. If an attacker had reconfigured it to use a different port the IDS may not be able to detect the presence of the trojan.
  • Coordinated, low-bandwidth attacks: coordinating a scan among numerous attackers (or agents) and allocating different ports or hosts to different attackers makes it difficult for the IDS to correlate the captured packets and deduce that a network scan is in progress.
  • Address spoofing/proxying: attackers can increase the difficulty of the ability of Security Administrators to determine the source of the attack by using poorly secured or incorrectly configured proxy servers to bounce an attack. If the source is spoofed and bounced by a server then it makes it very difficult for IDS to detect the origin of the attack.
  • Pattern change evasion: IDSs generally rely on 'pattern matching' to detect an attack. By changing the data used in the attack slightly, it may be possible to evade detection. For example, an Internet Message Access Protocol (IMAP) server may be vulnerable to a buffer overflow, and an IDS is able to detect the attack signature of 10 common attack tools. By modifying the payload sent by the tool, so that it does not resemble the data that the IDS expects, it may be possible to evade detection.

Development[edit]

The earliest preliminary IDS concept was delineated in 1980 by James Anderson at the National Security Agency and consisted of a set of tools intended to help administrators review audit trails.[17] User access logs, file access logs, and system event logs are examples of audit trails.

Fred Cohen noted in 1987 that it is impossible to detect an intrusion in every case, and that the resources needed to detect intrusions grow with the amount of usage.[18]

Dorothy E. Denning, assisted by Peter G. Neumann, published a model of an IDS in 1986 that formed the basis for many systems today.[19] Her model used statistics for anomaly detection, and resulted in an early IDS at SRI International named the Intrusion Detection Expert System (IDES), which ran on Sun workstations and could consider both user and network level data.[20] IDES had a dual approach with a rule-based Expert System to detect known types of intrusions plus a statistical anomaly detection component based on profiles of users, host systems, and target systems. Lunt proposed adding an Artificial neural network as a third component. She said all three components could then report to a resolver. SRI followed IDES in 1993 with the Next-generation Intrusion Detection Expert System (NIDES).[21]

The Multics intrusion detection and alerting system (MIDAS), an expert system using P-BEST and Lisp, was developed in 1988 based on the work of Denning and Neumann.[22] Haystack was also developed in that year using statistics to reduce audit trails.[23]

In 1986 the National Security Agency started an IDS research transfer program under Rebecca Bace. Bace later published the seminal text on the subject, Intrusion Detection, in 2000.[24]

Wisdom & Sense (W&S) was a statistics-based anomaly detector developed in 1989 at the Los Alamos National Laboratory.[25] W&S created rules based on statistical analysis, and then used those rules for anomaly detection.

In 1990, the Time-based Inductive Machine (TIM) did anomaly detection using inductive learning of sequential user patterns in Common Lisp on a VAX 3500 computer.[26] The Network Security Monitor (NSM) performed masking on access matrices for anomaly detection on a Sun-3/50 workstation.[27] The Information Security Officer's Assistant (ISOA) was a 1990 prototype that considered a variety of strategies including statistics, a profile checker, and an expert system.[28] ComputerWatch at AT&T Bell Labs used statistics and rules for audit data reduction and intrusion detection.[29]

Then, in 1991, researchers at the University of California, Davis created a prototype Distributed Intrusion Detection System (DIDS), which was also an expert system.[30] The Network Anomaly Detection and Intrusion Reporter (NADIR), also in 1991, was a prototype IDS developed at the Los Alamos National Laboratory's Integrated Computing Network (ICN), and was heavily influenced by the work of Denning and Lunt.[31] NADIR used a statistics-based anomaly detector and an expert system.

The Lawrence Berkeley National Laboratory announced Bro in 1998, which used its own rule language for packet analysis from libpcap data.[32] Network Flight Recorder (NFR) in 1999 also used libpcap.[33]

APE was developed as a packet sniffer, also using libpcap, in November, 1998, and was renamed Snort one month later. Snort has since become the world's largest used IDS/IPS system with over 300,000 active users.[34] It can monitor both local systems, and remote capture points using the TZSP protocol.

The Audit Data Analysis and Mining (ADAM) IDS in 2001 used tcpdump to build profiles of rules for classifications.[35] In 2003, Yongguang Zhang and Wenke Lee argue for the importance of IDS in networks with mobile nodes.[36]

In 2015, Viegas and his colleagues [37] proposed an anomaly-based intrusion detection engine, aiming System-on-Chip (SoC) for applications in Internet of Things (IoT), for instance. The proposal applies machine learning for anomaly detection, providing energy-efficiency to a Decision Tree, Naive-Bayes, and k-Nearest Neighbors classifiers implementation in an Atom CPU and its hardware-friendly implementation in a FPGA.[38][39] In the literature, this was the first work that implement each classifier equivalently in software and hardware and measures its energy consumption on both. Additionally, it was the first time that was measured the energy consumption for extracting each features used to make the network packet classification, implemented in software and hardware.[40]

Free and open source systems[edit]

See also[edit]

References[edit]

  1. ^ Abdullah A. Mohamed, "Design Intrusion Detection System Based On Image Block Matching", International Journal of Computer and Communication Engineering, IACSIT Press, Vol. 2, No. 5, September 2013.
  2. ^ Brandon Lokesak (December 4, 2008). "A Comparison Between Signature Based and Anomaly Based Intrusion Detection Systems" (PPT). www.iup.edu. 
  3. ^ "Gartner report: Market Guide for User and Entity Behavior Analytics". September 2015. 
  4. ^ "Gartner: Hype Cycle for Infrastructure Protection, 2016". 
  5. ^ "Gartner: Defining Intrusion Detection and Prevention Systems". Retrieved September 20, 2016. 
  6. ^ a b Scarfone, Karen; Mell, Peter (February 2007). "Guide to Intrusion Detection and Prevention Systems (IDPS)" (PDF). Computer Security Resource Center. National Institute of Standards and Technology (800–94). Retrieved 1 January 2010. 
  7. ^ a b "NIST – Guide to Intrusion Detection and Prevention Systems (IDPS)" (PDF). February 2007. Retrieved 2010-06-25. 
  8. ^ a b Robert C. Newman (19 February 2009). Computer Security: Protecting Digital Resources. Jones & Bartlett Learning. ISBN 978-0-7637-5994-0. Retrieved 25 June 2010. 
  9. ^ a b c Michael E. Whitman; Herbert J. Mattord (2009). Principles of Information Security. Cengage Learning EMEA. ISBN 978-1-4239-0177-8. Retrieved 25 June 2010. 
  10. ^ Tim Boyles (2010). CCNA Security Study Guide: Exam 640-553. John Wiley and Sons. p. 249. ISBN 978-0-470-52767-2. Retrieved 29 June 2010. 
  11. ^ Harold F. Tipton; Micki Krause (2007). Information Security Management Handbook. CRC Press. p. 1000. ISBN 978-1-4200-1358-0. Retrieved 29 June 2010. 
  12. ^ John R. Vacca (2010). Managing Information Security. Syngress. p. 137. ISBN 978-1-59749-533-2. Retrieved 29 June 2010. 
  13. ^ Engin Kirda; Somesh Jha; Davide Balzarotti (2009). Recent Advances in Intrusion Detection: 12th International Symposium, RAID 2009, Saint-Malo, France, September 23–25, 2009, Proceedings. Springer. p. 162. ISBN 978-3-642-04341-3. Retrieved 29 June 2010. 
  14. ^ a b nitin.; Mattord, verma (2008). Principles of Information Security. Course Technology. pp. 290–301. ISBN 978-1-4239-0177-8. 
  15. ^ a b c Anderson, Ross (2001). Security Engineering: A Guide to Building Dependable Distributed Systems. New York: John Wiley & Sons. pp. 387–388. ISBN 978-0-471-38922-4. 
  16. ^ http://www.giac.org/paper/gsec/235/limitations-network-intrusion-detection/100739
  17. ^ Anderson, James P., "Computer Security Threat Monitoring and Surveillance," Washing, PA, James P. Anderson Co., 1980.
  18. ^ David M. Chess; Steve R. White (2000). "An Undetectable Computer Virus". Proceedings of Virus Bulletin Conference. 
  19. ^ Denning, Dorothy E., "An Intrusion Detection Model," Proceedings of the Seventh IEEE Symposium on Security and Privacy, May 1986, pages 119–131
  20. ^ Lunt, Teresa F., "IDES: An Intelligent System for Detecting Intruders," Proceedings of the Symposium on Computer Security; Threats, and Countermeasures; Rome, Italy, November 22–23, 1990, pages 110–121.
  21. ^ Lunt, Teresa F., "Detecting Intruders in Computer Systems," 1993 Conference on Auditing and Computer Technology, SRI International
  22. ^ Sebring, Michael M., and Whitehurst, R. Alan., "Expert Systems in Intrusion Detection: A Case Study," The 11th National Computer Security Conference, October, 1988
  23. ^ Smaha, Stephen E., "Haystack: An Intrusion Detection System," The Fourth Aerospace Computer Security Applications Conference, Orlando, FL, December, 1988
  24. ^ McGraw, Gary (May 2007). "Silver Bullet Talks with Becky Bace" (PDF). IEEE Security & Privacy Magazine. 5 (3): 6–9. doi:10.1109/MSP.2007.70. Retrieved 18 April 2017. 
  25. ^ Vaccaro, H.S., and Liepins, G.E., "Detection of Anomalous Computer Session Activity," The 1989 IEEE Symposium on Security and Privacy, May, 1989
  26. ^ Teng, Henry S., Chen, Kaihu, and Lu, Stephen C-Y, "Adaptive Real-time Anomaly Detection Using Inductively Generated Sequential Patterns," 1990 IEEE Symposium on Security and Privacy
  27. ^ Heberlein, L. Todd, Dias, Gihan V., Levitt, Karl N., Mukherjee, Biswanath, Wood, Jeff, and Wolber, David, "A Network Security Monitor," 1990 Symposium on Research in Security and Privacy, Oakland, CA, pages 296–304
  28. ^ Winkeler, J.R., "A UNIX Prototype for Intrusion and Anomaly Detection in Secure Networks," The Thirteenth National Computer Security Conference, Washington, DC., pages 115–124, 1990
  29. ^ Dowell, Cheri, and Ramstedt, Paul, "The ComputerWatch Data Reduction Tool," Proceedings of the 13th National Computer Security Conference, Washington, D.C., 1990
  30. ^ Snapp, Steven R, Brentano, James, Dias, Gihan V., Goan, Terrance L., Heberlein, L. Todd, Ho, Che-Lin, Levitt, Karl N., Mukherjee, Biswanath, Smaha, Stephen E., Grance, Tim, Teal, Daniel M. and Mansur, Doug, "DIDS (Distributed Intrusion Detection System) -- Motivation, Architecture, and An Early Prototype," The 14th National Computer Security Conference, October, 1991, pages 167–176.
  31. ^ Jackson, Kathleen, DuBois, David H., and Stallings, Cathy A., "A Phased Approach to Network Intrusion Detection," 14th National Computing Security Conference, 1991
  32. ^ Paxson, Vern, "Bro: A System for Detecting Network Intruders in Real-Time," Proceedings of The 7th USENIX Security Symposium, San Antonio, TX, 1998
  33. ^ Amoroso, Edward, "Intrusion Detection: An Introduction to Internet Surveillance, Correlation, Trace Back, Traps, and Response," Intrusion.Net Books, Sparta, New Jersey, 1999, ISBN 0-9666700-7-8
  34. ^ Kohlenberg, Toby (Ed.), Alder, Raven, Carter, Dr. Everett F. (Skip), Jr., Esler, Joel., Foster, James C., Jonkman Marty, Raffael, and Poor, Mike, "Snort IDS and IPS Toolkit," Syngress, 2007, ISBN 978-1-59749-099-3
  35. ^ Barbara, Daniel, Couto, Julia, Jajodia, Sushil, Popyack, Leonard, and Wu, Ningning, "ADAM: Detecting Intrusions by Data Mining," Proceedings of the IEEE Workshop on Information Assurance and Security, West Point, NY, June 5–6, 2001
  36. ^ Intrusion Detection Techniques for Mobile Wireless Networks, ACM WINET 2003 <http://www.cc.gatech.edu/~wenke/papers/winet03.pdf>
  37. ^ Viegas, E.; Santin, A. O.; Fran?a, A.; Jasinski, R.; Pedroni, V. A.; Oliveira, L. S. (2017-01-01). "Towards an Energy-Efficient Anomaly-Based Intrusion Detection Engine for Embedded Systems". IEEE Transactions on Computers. 66 (1): 163–177. ISSN 0018-9340. doi:10.1109/TC.2016.2560839. 
  38. ^ França, A. L.; Jasinski, R.; Cemin, P.; Pedroni, V. A.; Santin, A. O. (2015-05-01). "The energy cost of network security: A hardware vs. software comparison". 2015 IEEE International Symposium on Circuits and Systems (ISCAS): 81–84. doi:10.1109/ISCAS.2015.7168575. 
  39. ^ França, A. L. P. d; Jasinski, R. P.; Pedroni, V. A.; Santin, A. O. (2014-07-01). "Moving Network Protection from Software to Hardware: An Energy Efficiency Analysis". 2014 IEEE Computer Society Annual Symposium on VLSI: 456–461. doi:10.1109/ISVLSI.2014.89. 
  40. ^ "Towards an Energy-Efficient Anomaly-Based Intrusion Detection Engine for Embedded Systems" (PDF). SecPLab. 

 This article incorporates public domain material from the National Institute of Standards and Technology document "Guide to Intrusion Detection and Prevention Systems, SP800-94" by Karen Scarfone, Peter Mell (retrieved on 1 January 2010).

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