Undeniable secure data transmission method based on block chain

Abstract

The invention discloses a non-deniable secure data transmission method based on a block chain. The method comprises the following steps that: (1) a receiver generates a temporary public and private key pair and sends a public key and a block chain account address thereof to a sender; (2) uploading initialization parameters to the intelligent contract in the sending direction; (3) the sending end pays the guarantee money to the intelligent contract; (4) receiving the deposit paid to the intelligent contract; (5) the sender sends the ciphertext and the digital signature of the ciphertext hash value to the receiver; (6) after the receiver obtains the ciphertext, a ciphertext hash value is disclosed to the intelligent contract; (7) the sending direction intelligent contract publicly uses the temporary public key to encrypt the ciphertext obtained by the secret key; and (8) the receiver obtains the ciphertext in the step (7) from the block chain, decrypts the original key by using the temporary private key and publishes the key hash value to the smart contract, and the smart contract returns the guarantee money of the two parties. The method and the device can be used for effectively realizing non-repudiation of a sender and a receiver on a transmission behavior in a secure data transmission process.

Description

technical field [0001] The invention relates to a data transmission method, in particular to a blockchain-based undeniable secure data transmission method. Background technique [0002] Blockchain and smart contracts: Blockchain technology, as a distributed digital ledger technology, with the help of cryptography, allows people to build confidence in mutual collaboration without the supervision of a central authority, and realizes in a distributed network Decentralization of multilateral transactions. All nodes in the blockchain keep the same digital ledger, and the contents of the ledger are open to everyone, and once the data is uploaded to the chain and stored in the ledger, it cannot be tampered with. At present, there are several blockchain technology platforms in the world for the research of blockchain technology and its applications. The Ethereum project (Ethereum) and Hyperledger Fabric (Hyperledger Fabric) that support smart contracts are representative platforms...

AI Technical Summary

Problems solved by technology

[0005] In the existing non-repudiation data transmission scheme, if a trusted third party is not introduced, both parties of the data transmission need to confirm the non-repudiation of both parties through multiple transmissions of data fragmentation, zero-knowledge proof, digital signature, etc., which is usually more efficient. Low; if a trusted third party is introduced, the two parties can interact through the trusted third party as an intermediary (such as key distribution, receipt confirmation, etc.), but the introduction of a trusted third party will incur additional costs and it is difficult to find qualified trusted third party

In addition, both of the above two methods require participants or trusted third parties to store undeniable evidence of data transmission. Considering business migration, storage capacity limitations or human operation errors, such evidence is not easy to store safely for a long time

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