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Method and apparatus for detecting unauthorized-access, and computer product

  • US 8,166,553 B2
  • Filed: 10/26/2004
  • Issued: 04/24/2012
  • Est. Priority Date: 05/28/2002
  • Status: Expired due to Fees
First Claim
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1. An unauthorized-access detecting apparatus that detects unauthorized access to a server that provides a service via a network, the unauthorized-access detecting apparatus comprising:

  • a storing unit that stores an unauthorized-access event string including a series of process requests made by an unauthorized user in past times, and a transition probability and a time interval between two consecutive process requests included in the unauthorized-access event string;

    a receiving unit that receives a process request from a user; and

    a judging unit that judges whether an unauthorized access occurs or not by comparing the unauthorized-access event string stored in the storing unit with an event string including a series of process requests received by the receiving unit, and, when it is determined that the event string matches with at least a portion of the unauthorized-access event string, estimates an occurrence time of the unauthorized access by adding time intervals between process requests included in the unauthorized-access event string and estimates a probability of an occurrence of the unauthorized access by multiplying transition probabilities between process requests included in the unauthorized-access event string.

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