Multi-center block chain transaction privacy protection system and method

Abstract

The invention discloses a multi-center block chain transaction privacy protection system and method. The system comprises an alliance control module, an amount verification module, a range verification module, an encryption module, a decryption module and a block chain system transaction module, wherein the alliance control module is used for generating alliance parameters by multiple participants; the amount verification module is used for verifying that input and output of an encrypted ciphertext amount in a transaction are equal; the range verification module is used for verifying that theencrypted ciphertext amount in the transaction is in a specific interval and is constantly positive; the encryption module and the decryption module are used for carrying out homomorphic encryption and decryption on the amount in transmission and reception processes; and the block chain system transaction module is used for complete bitcoin-like digital currency transaction systems, and has a complete transaction process which comprises transmission, reception, broadcasting and block confirmation. The system is capable of enhancing general structures through block chain transaction privacies under a multi-center supervision mode, so as to realize privacy protection for trapdoor parameters under joint control of multiple parties and transaction metadata in transaction process, and effectively strengthen the safety of plaintext amounts in multi-center block chain system transaction process.

Description

technical field [0001] The present invention relates to the technical fields of cryptography and cryptographic currency in information security, and in particular to a multi-center blockchain transaction privacy protection system and method. Background technique [0002] The blockchain-like transaction system originated from the Bitcoin digital currency system. In 2008, Japanese programmer Satoshi Nakamoto designed and released a peer-to-peer decentralized digital currency - Bitcoin. The Bitcoin system proposes a new distributed model based on peer-to-peer, which removes the trusted central institution of traditional electronic currency. The concealment and decentralization of Bitcoin have led to the rise of a series of Internet currencies based on cryptography. According to different working principles, including PoW (Proof of Work, workload proof)-based Bitcoin, Litecoin, and Dogecoin, PoS (Proof of Stake, equity proof)-based BitShares, Smart Square Black Coin, and PoW-b...

AI Technical Summary

Problems solved by technology

[0004] However, with the large-scale spread of blockchain-like transaction systems, the internal design and operation of the system have brought about two public privacy leakage issues: 1) the trust of members in multi-party supervision, such as the cooperation between alliance chains; 2) The privacy disclosure of metadata during the transaction process, such as the exposure of the plaintext amount in the transaction

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