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

Abstract

The invention discloses a group communication method and system based on a hierarchical structure symmetric key pool, and the method comprises the steps: (1), carrying out the tree structure layering of a group, and enabling the highest layer to be a group administrator, and storing a key pool and a replacement key; (2) group members of other layers in the tree structure calculate corresponding replacement keys according to IDs of the group members and the replacement keys of father nodes of the group members and store the corresponding replacement keys; (3) each group member of the first layer calculates and obtains a key pool thereof according to the replacement key thereof and the key pool of the 0th layer, and the key pools of the group members of all levels below the first layer are the same as the key pools of the father nodes thereof; and (4) a sender of communication among the group members selects a key from the target key pool as a communication key through a preset key selection mode. According to the invention, under the condition that a certain sub-group symmetric key pool is cracked, the security of group communication can still be ensured; and the key pool can be updated only by transmitting a small number of keys.

Description

technical field [0001] The invention relates to the field of group communication, in particular to a group communication method and communication system based on a layered structure 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 transmiss...

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Problems solved by technology

In the case that the symmetric key pool is shared by group members, this method of key retrieval is easy to be known by group members, and the privacy is not high;

[0007] 3. 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;

[0008] 4. In the existing group communication system based on the key pool, the status of all members with the group key pool is the same, and any member being captured will lead to the failure of the entire group communication system

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