Method for guaranteeing non-duplicate message SN and preventing from re-play attack and mobile terminal

Abstract

An embodiment of the invention discloses a method for insuring an information sequence number to be non-repetitive for a mobile terminal and a mobile terminal, the method comprising: generating an authorization key context comprising information sequence number attributes; building up an information sequence number parameter by the information sequence number attributes in a generated authorization key context, and setting the information sequence number parameter to be an initial value. The invention also discloses a method for preventing a replay attack for a mobile terminal and a mobile terminal, the method comprising: receiving a manage information with an information sequence number parameter sent by a base station, wherein the information sequence number parameter is built up by theinformation sequence number attributes generated by the base station in the authorization key context; judging whether the received manage information is playback information based on the informationsequence number parameter, if yes, discarding the manage information, and otherwise, receiving the manage information. The information can insure information sequence number to be always non-repetitive in the authorization key context for preventing the replay attack.

Description

[0001] This application is a divisional application of an earlier Chinese application with the application number CN200510080018.8, the application date is June 24, 2005, and the subject of the invention is "a method for preventing replay attacks". technical field [0002] The invention relates to a technique for improving the security of a wireless communication system, in particular to a method for preventing replay attacks. Background technique [0003] In a communication system, security is an important indicator to evaluate the performance of a communication system, especially in a wireless communication system, due to the characteristics of openness and mobility of a wireless communication system, the security of a wireless communication system is particularly important . With the development of cryptography and cryptanalysis, the security of the wireless communication system can be improved by encrypting the data transmitted on the air interface of the wireless commun...

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Problems solved by technology

However, since CMAC_PN has no direct relationship with AK in the above method, it may appear that in the context of an AK, CMAC_PN starts counting from a larger value, and starts counting from the initial value after counting to the maximum value, Therefore, it cannot be guaranteed that CMAC_PN will always increase upwards in the context of an AK, resulting in very complicated processing when the receiver judges whether the received message is a replay message according to the message sequence number CMAC_PN

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