Alliance chain cross-chain privacy protection method based on group signature and CA multi-party authentication

Abstract

The invention discloses an alliance chain cross-chain privacy protection method based on group signature and CA multi-party authentication. In the alliance chain, full-life-cycle supervision in the chain and privacy protection of cross-chain transactions of the alliance chain are achieved through a technical system integrating certificate distribution uplink and group signature encryption. According to the invention, the certificate blockchain is introduced, and the CA of the alliance chain maintains the certificate blockchain and packages the operation and content of the distributed certificates into a transaction uplink, thereby achieving the later tracing and evidence obtaining of the alliance chain. A group signature technology is introduced, a node of an alliance chain uses a group public key to encrypt a cross-chain transaction to achieve identity privacy protection of the transaction, and an administrator uses a group private key to obtain a signer of the cross-chain transactionto achieve supervision. Generation of a digital certificate and a group public and private key and signature and verification of transaction information are achieved by integrally adopting a currentinternationally universal asymmetric encryption algorithm or an over-encryption algorithm, so that overall data privacy protection of the alliance chain is ensured.

Description

technical field [0001] The invention belongs to the technical field of block chains, and in particular relates to a method for protecting alliance chain cross-chain privacy based on group signature and CA multi-party authentication. Background technique [0002] Blockchain technology, blockchain is a chained data structure that combines data blocks in a sequential manner in chronological order, involving many scientific and technological issues such as mathematics, cryptography, the Internet, and computer programming. The integrated application of distributed data storage, point-to-point transmission, consensus mechanism, asymmetric encryption algorithm, smart contract and other technologies, in order to realize the characteristics of traceability, sharing and non-tampering in blockchain technology. [0003] The consortium chain is a special scenario application of the blockchain implemented by using blockchain technology. It has a certain access mechanism for nodes that wan...

AI Technical Summary

Problems solved by technology

However, the process of issuing certificates by this mechanism cannot be reproduced, and it is extremely difficult to trace the process in the later stage; and the distributed data is not saved, and it is difficult to obtain evidence

At the same time, the cross-chain transactions published in the traditional alliance chain are directly signed by the two parties to the transaction. Any member in the alliance chain can know the identity information of the two parties to the transaction, and the identity privacy cannot be protected; while in practical applications Among them, many cross-chain transactions cannot be known by other people except the two parties of the transaction. It is only informed from this alliance chain, and at the same time, it needs to meet the needs of reviewing the transaction

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