Method, equipment and system for updating group cipher key

Abstract

The invention discloses a method for updating group key which includes steps as follows: an attribute network entity obtains GK according with a version number KV of a group sign GID and a group key GK, and a local boot key SK(GID) for deciphering an internal mobile user identifying code IMSI encrypted by GK provided by an user equipment; the attribute network entity generates new group key GKn according with GID, KVn, SK(GID) when KV differs from the local version number KVn; the attribute network entity generates updating key UK according with IMSI, user's authentication key K, uses UK for encrypting GID, KVn and GKn, and providing to an user equipment; the user equipment generates UK according with IMSI, K, deciphers out GID, KVn and GKn, updates the group key GK and the version numberKV. The invention also discloses the attribute network entity and a communication system. The method can improve IMSI security and solve threaten of exposing IMSI.

Description

Method, device and system for updating group key technical field The invention relates to the technical field of communication, in particular to a group key update method, device and system. Background technique In 2G (2Generation, second-generation mobile communication network), 3G (3Generation, third-generation mobile communication network), and LTE (LongTermEvolution, long-term evolution network) systems, IMSI (International Mobile Subscriber Identity, International Mobile Subscriber Identity) is used in the air interface as When transmitting in plain text, the attacker can obtain the user's IMSI by eavesdropping or actively attacking by requesting the user to send the IMSI. Once the IMSI is intercepted, an attacker can use this vulnerability to collect the IMSI of a certain area (such as an airport) to track the user's location information. In 3G and LTE systems, the TMSI (TemporaryMobileSubscriberIdentity, Temporary Mobile Station Identity) mechanism is adopted for ...

AI Technical Summary

Problems solved by technology

However, the user's group is immutable, and the network side cannot adjust the user's group according to certain security policies, thus increasing the threat of attackers guessing the user's real identity

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