A data transmission method and device based on alliance chain

Abstract

The invention discloses a data transmission method and device based on alliance chain, the method includes: dividing data into several data blocks, using different symmetric keys to encrypt data blocks correspondingly, generating and numbering ciphertexts of several data blocks and uploading them to the blocks chain; use the public key of the first node to encrypt the symmetric key, generate the first key ciphertext and upload it to the blockchain; use the private key of the first node to decrypt the numbered ciphertext from the blockchain, and obtain The number of the ciphertext of the data block to be queried by the second node; when the second node is allowed to query, use the public key of the second node to encrypt the corresponding symmetric key, generate the second key ciphertext, and pass the block chain Send to the second node, so that the second node uses its own private key to decrypt the second key ciphertext to obtain the corresponding symmetric key. The invention ensures the safety, controllability and recoverability of data, and simultaneously improves the efficiency of encryption and decryption.

Description

technical field [0001] The invention relates to the technical field of block chains, in particular to a data transmission method and device based on alliance chains. Background technique [0002] Blockchain is a new application model that integrates distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies. According to the degree of centralization of the blockchain network, blockchains in three different application scenarios are differentiated: [0003] 1. A blockchain that is public on the entire network and has no user authorization mechanism is called a public chain; [0004] 2. Authorized nodes are allowed to join the network, and information can be viewed according to authority, which is often used in inter-institutional blockchains, called alliance chains; [0005] 3. All nodes in the network are in the hands of an organization, which is called a private chain. [0006] From the present point o...

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problems of the existing technology, the embodiment of the present invention provides a data transfer method and device based on the consortium chain to overcome the overall encryption and decryption in the prior art, the receiver can only view the entire message after obtaining the key, and the sender Unable to fine-grained control (for example, only allow the receiver to see a specific part), the security of the network transmission key in the symmetric encryption technology is not very high, and the encryption and decryption speed in the asymmetric encryption technology is slow, etc.

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