Group key managing method based on Chinese remainder theorem

Abstract

The invention discloses a group key managing method based on Chinese remainder theorem. The method comprises the steps of: dividing a group into a plurality of subgroups, managing member subgroups by a subgroup key manager, managing SKS subgroups by a total group key manager; providing the member information for the subgroup key manager by the group members; allocating the subgroup keys to the member subgroups by the subgroup key manager, and allocating the subgroup keys of the SKS subgroups by the total key manager; after the subgroup keys are allocated, allocating the group keys by the total group key manager and the subgroup key manager; carrying out precalculation on the public data in the updating interval by the subgroup key manager, and updating the subgroup keys by the subgroup key manager after the group members are changed; after the subgroup keys are completely updated, updating the group keys by the subgroup key manager; in the whole process of the group communication, continuously updating the subgroup keys in a updating mode by the SKS subgroup based on time. The invention has the advantages of high safety, low updating cost and little updating delay, and can be usedfor large-scale group communication system.

Description

technical field [0001] The invention belongs to the technical field of communication network security, in particular to a group key management method. Members in the group share a group key, and use the group key to encrypt communication messages when communicating, so that communication messages are transmitted in the form of ciphertext in public channels, thereby achieving the confidentiality of communication information. Background technique [0002] Multicast technology is more and more widely used in the network, and group communication based on multicast is widely used in remote video conferencing, billing TV and online games, etc. Due to the increasingly serious security threats on the Internet and the security problems exposed by multicast group communication itself, multicast applications must consider ensuring the security of group communication. The basic approach to securing communication among group members is for group members to share a group key that is not ...

AI Technical Summary

Problems solved by technology

In practical applications, the security of covert channels is not fully guaranteed, so these methods are less secure

Moreover, when the group key is updated in this method, the transmission of related data must depend on the successful transmission of previous data, so the key update delay is high

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