Blockchain-based secure transaction method and system

Abstract

The present invention relates to a block chain-based secure transaction method and system. The block chain-based secure transaction method includes: the regulator writes its digital certificate and its corresponding first public key into the area corresponding to the type of assets to be supervised. In the smart contract of the block chain, all institutions with asset accounts under the asset category can obtain the first public key of the regulator through digital certificates to generate an additive homomorphic secret key for homomorphic encryption of the balance of the asset account; When the regulator checks the balance of the transaction party's new account, it obtains the public key in the public-private key group corresponding to the new account, based on the supervisory private key corresponding to the predetermined secret key exchange protocol and the public-private key group public key, and generate an additive homomorphic key according to the key exchange protocol, and use the generated additive homomorphic key to decrypt the encrypted new account balance of the new account. The invention can effectively guarantee the account security of the transaction based on the block chain and supervise the account, and can improve the efficiency of transaction processing.

Description

technical field [0001] The present invention relates to the technical field of block chains, in particular to a method and system for secure transactions based on block chains. Background technique [0002] Blockchain technology has the characteristics of decentralization and non-tamperable information. Using blockchain technology can realize transaction events involving multiple parties (for example, transfer transactions, payment transactions, etc.). If the transaction is performed on the blockchain, all other nodes on the blockchain will know the transaction, and other participants can participate in confirming the accuracy of the transaction to prevent information tampering. However, since there is no absolute authority node in this transaction method, it is necessary to collectively verify each transaction. The disadvantage is that the transactions of the transaction participants will have no privacy at all, and the account of an organization may be blocked by other nod...

AI Technical Summary

Problems solved by technology

However, since there is no absolute authority node in this transaction method, it is necessary to collectively verify each transaction. The disadvantage is that the transactions of the transaction participants will have no privacy at all, and the account of an organization may be blocked by other nodes. Institutional tracking on the Internet, which poses a risk of information leakage

However, there are still deficiencies: for example, when the account balance of an account is protected by additive homomorphic encryption, only the owner of the homomorphic encryption key can know the actual balance of the account, making it difficult for regulators to supervise the liquidity of financial assets

If the asset owner is required to pass the homomorphic encryption key to the supervisor in some form, it will be prone to errors and / or security risks due to the complexity of the system processing steps, and the efficiency will be low

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