Computer Network Security

A particular vendor uses the following approach to intrusion detection.16 The company maintains a large number of honeypots distributed across the Internet. To a potential attacker, these honeypots look like vulnerable systems. Consequently, the honeypots attract many attacks and, in particular, new attacks tend to show up on the honeypots soon after— sometimes even during—their development. Whenever a new attack is detected at one of the honeypots, the vendor immediately develops a signature and distributes the resulting signature to all systems using its product. The actual derivation of the signature is generally a manual process.

a. What are the advantages, if any, of this approach as compared to a standard signature-based system?

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b. What are the advantages, if any, of this approach as compared to a standard anomaly-based system?

c. Using the terminology given in this chapter, the system outlined in this problem would be classified as a signature-based IDS, not an anomaly-based IDS. Why?

d. The definition of signature-based and anomaly-based IDS are not standardized.17 The vendor of the system outlined in this problem refers to it as an anomaly-based IDS. Why might they insist on calling it an anomaly-based IDS, when your well-nigh infallible author would classify it as a signature-based system?

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