Flexible asymmetric group key negotiation method

Abstract

The invention discloses a flexible asymmetric group key negotiation method. The method comprises the steps of carrying out parameter initialization by members participating in group key negotiation, thereby generating public / private key pairs; blinding group contribution key shares through the public / private key pairs, and broadcasting group key shares; after the rest members receive corresponding broadcasting key shares, carrying out combination calculation, thereby obtaining group keys; and verifying whether calculated group keys are correct or not by the group members, encrypting communication information through the group keys if the calculated group keys are correct, and exchanging group security information. According to the method, members in or out of a group can select any one subset object in the group for secret information exchange; an object not selected by an information sender cannot decrypt the shared information; the group members can negotiate an encryption key and a decryption key which are consistent; the group members can verify the correctness of the keys; anonymity of the members participating in group key negotiation can be realized; and the personal private information of the group members can be protected.

Description

Technical field [0001] The invention belongs to the technical field of information security and cryptography, and relates to the key technology of secret information exchange and transmission between group members: a group key agreement method, and particularly relates to a group in a multi-level, three-dimensional information environment A method of flexible asymmetric group key agreement for information exchange and secure transmission. Background technique [0002] Group key agreement is to ensure the security of communication by group members to jointly calculate the group encryption and decryption keys required for communication between groups. It is to ensure that group members distributed in different areas conduct secure collaborative computing through public networks. , Resource sharing, information exchange and other key technologies. With the rapid development of information technology, the network environment of information services is becoming more and more complex,...

AI Technical Summary

Problems solved by technology

A series of challenging problems need to be solved, including the combined calculation of group dynamic key factors, the calculation of group dynamic encryption and decryption keys, and selective information exchange technology.

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