Data transmission method and device based on alliance chain

Abstract

The invention discloses a data transmission method and device based on an alliance chain. The method comprises the following steps of dividing data into several data blocks, using different symmetricsecret keys to correspond to encrypted data blocks, generating and numbering several data block ciphertexts, and then uploading to a blockchain; using the public key of a first node to encrypt the symmetric secret keys, generating a first secret key ciphertext and then uploading to the blockchain; using the private key of the first node to decrypt a numbered ciphertext from the blockchain, and obtaining the ciphertext number of the data block to be inquired of a second node; and when the second node is allowed to inquire, using the public key of the second node to encrypt the corresponding symmetric secret key to generate a second secret key ciphertext, sending to the second node through the blockchain so that the second node decrypts the second secret key ciphertext by using the private key to obtain the corresponding symmetric secret key. in the invention, the safety, the controllability and the restorability of the data are ensured, and simultaneously the efficiency of encryption and decryption is increased.

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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