Retrieval method and system for encrypted information evidence based on block chain and electronic equipment

Abstract

The invention discloses a retrieval method for encrypted information evidence storage based on a block chain. The retrieval method comprises the following steps: encrypting a storage position of certificate information by adopting an asymmetric encryption technology; adding the encrypted storage location information to the voucher information; calculating a hash value of the voucher information by adopting an SHA256 hash function; recording the voucher information and the corresponding hash value into the smart contract on the chain; for the chained credit voucher, creating a hash retrieval tree in the smart contract according to the hash value of the voucher information, wherein each node on the hash retrieval tree correspondingly stores one piece of voucher information; and according to the Hash value, obtaining the voucher information, verifying the voucher information, and decrypting the verified storage position information. The retrieval method and system for encrypted information evidence based on the block chain and the electronic equipment have the advantages of high confidentiality, quick data retrieval and the like.

Description

technical field [0001] The invention relates to the technical field of block chains, in particular to a retrieval method, system and electronic equipment based on block chain encrypted information storage certificates. Background technique [0002] Blockchain is a decentralized accounting technology. Since the advent of Bitcoin in 2008, it has played a huge role in various application scenarios due to its characteristics of decentralization, privacy protection, and difficulty in tampering. With the development of technology, representative blockchain platforms such as Ethereum and Hyperledger Fabric have come out one after another, and they also represent the vigorous development of the blockchain technology field. However, in the combined field of blockchain and supply chain finance, it is difficult to save unstructured data (text, pictures, videos, certificates, etc.) on the blockchain, and only information such as bytecode can be saved. As a result, the credit certificat...

AI Technical Summary

Problems solved by technology

However, in the combined field of blockchain and supply chain finance, it is difficult to save unstructured data (text, pictures, videos, certificates, etc.) on the blockchain, and only information such as bytecode can be saved. As a result, the credit certificate information of small and medium-sized enterprises in supply chain finance is difficult to upload to the chain, and how to ensure the confidentiality of the information on the chain and the rapid retrieval of data are also problems that need to be solved

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