Group communication method and system based on tree structure symmetric key pool

Abstract

The invention provides a group communication method and system based on a tree structure symmetric key pool, and the method comprises the steps: taking a group member as a node in a tree structure, constructing a group communication tree structure, and distributing a replacement key and a key pool for each node in the tree structure. The key pool and the replacement key of the child node are calculated by the key pool and the replacement key of the father node of the child node, in this way, diversity and variability of symmetric keys used for communication among members can be realized on the premise that only finite-length key pools are stored in the members in the group, the difficulty of cracking the group communication key by a third party is increased, and the service life of the group communication key is prolonged. And the communication security of the whole group is improved.

Description

technical field [0001] The invention relates to the field of group communication, in particular to a group communication method and system based on a tree-structured symmetric key pool. Background technique [0002] With the continuous development of wireless communication technologies, direct device to device communication (Device to Device, D2D) has become one of the hot spots of 3GPP Rel-12 standardization technology. D2D allows two user equipments (User Equipment, UE) to directly perform data transmission through a specific channel (Sidelink Channel) without going through an evolved base station equipment (Evolutional Node B, eNB). Of course, D2D is not limited to data transmission between two user equipments, and can also support point-to-multipoint group communication (Group Communication). Most of the existing network authentication systems are based on the one-to-one authentication method of a single object, but for point-to-multipoint data transmission, groups will...

AI Technical Summary

Problems solved by technology

[0006] 1. In the existing group communication system based on the key pool, all members who have the group key pool have the same status, and any member being captured will lead to the failure of the entire group communication system;

[0007] 2. In the existing technology, due to the large capacity of the group symmetric key pool, it cannot be stored in a highly secure security chip, and there is a possibility that it will be disassembled and cracked after being captured; the group symmetric key pool is Shared by all members in the group, once the group-type symmetric key pool is cracked, the security of group communication based on the group-type symmetric key pool will be threatened;

[0008] 3. The existing key extraction method based on the symmetric key pool is as follows: first select a key location, and then take out the entire key from this location. The method is easy to be predicted or even completely cracked, and the security is not high;

[0009] 4. The existing key pool update method is that one party generates a key and sends it to the other party. Due to the huge amount of keys in the key pool, it will take a lot of time to update the key pool; for group communication, It is necessary to pass the same key to each member of the group, and the amount of keys is even larger, which is often difficult to achieve

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