Blind signature based privacy preservation method for admissible block chains

Abstract

The invention discloses a permission block chain privacy protection method based on blind signature. For transaction content, the transaction information m is encrypted blindly by Hash function, and then the transaction is signed by the address private key of both parties to ensure that the transaction information can only be viewed by both parties, and then only the unique DAID of digital assets,the blind signature of the transaction and the endorsement public key of the endorsing node are recorded on the block chain; the transaction information m is encrypted blindly by Hash function, and then the transaction is signed by both parties' address private keys. For the identity information of the transaction user, the information written into the block chain has only the blind signature andthe third-party public key address which provides the blind signature, and the ID of the digital asset. The latter two have nothing to do with the transaction information and the user information, and the blind signature is unforgeable and unextractable, so the privacy of the identity information of the user can be protected. The invention can not only protect the identity information privacy ofboth sides of the transaction, but also protect the information of the transaction during the transaction of the licensing block chain.

Description

technical field

[0001] The invention relates to the technical field of privacy protection, in particular to a blind signature-based permissioned block chain privacy protection method. Background technique

[0002] Blockchain, as the underlying technology of Bitcoin, has set off a wave of research in recent years. In essence, the blockchain is a decentralized database. Due to its tamper-proof, good openness, and autonomy and anonymity, it is completely different from the current social model. It is widely sought after by people and is even known as "The Fourth Industrial Revolution". The blockchain solves the trust problem in the current society, and uses certain cryptography technology and consensus mechanism to solve the problem of completing fair and credible operations in an untrustworthy environment. But the current blockchain still has quite serious privacy leakage problems. In particular, the transaction layer of the blockchain contains a large amount of sensitive t...

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