Blockchain-based symmetric group key agreement method

Abstract

The present invention proposes a blockchain-based symmetric group key negotiation method, the steps of which are as follows: the key generation center and terminal members in the group information exchange network domain generate their own public / private key pairs; The information composed of IP addresses and public key pairs is broadcast to each other, and based on the size of the IP address, the information is sorted to obtain a sequence pair set of all members of the group; the first node in the sequence pair set sends the message composed of group key parameters Encapsulate it into a block and pass it to the next node, and cycle until the last node; the last node calculates its own group key and encapsulates the message composed of group key parameters into the block and broadcasts it to other nodes; other nodes Calculate their respective group keys; verify the correctness of the group keys. The invention adopts block chain technology to protect personal privacy, makes group key calculation and communication more balanced, has strong traceability, and makes group key negotiation of mobile ad hoc network more flexible, efficient and practical.

Description

technical field [0001] The present invention relates to the technical field of information security, in particular to a blockchain-based symmetric group key agreement method. Background technique [0002] Group key agreement has a wide range of applications, such as secure multi-party computing, secure resource sharing, and distributed collaborative computing. In the mobile ad hoc network with self-organization, decentralization and dynamic topology changes, group communication needs to ensure the safe exchange and transmission of information. The group key agreement scheme is to calculate the group session key online between groups, and then use the session key to carry out group encrypted communication. It is one of the key technologies to ensure safe information exchange and transmission between groups. [0003] In the mobile ad hoc network, in order to ensure the confidentiality, integrity and leakage resistance of the communication information between the groups, the c...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problem that the existing group key agreement method is used for identity authentication, personal identity information is easily exposed, and the information is highly sensitive, and the access rights of group members cannot be determined. The present invention proposes a blockchain-based The symmetric group key agreement method uses the blockchain anonymous authentication technology to realize personal privacy protection in the identity authentication process of the group key agreement, and uses the blockchain distributed computing technology to reduce the calculation and cost of each participant. Communication overhead, using blockchain recording technology for traceability and accountability, to prevent terminals without authorization from joining group communication

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