Blockchain-based data cloud storage encryption method and system

Abstract

The invention discloses a blockchain-based data cloud storage encryption method and system. The method includes the following steps that: a data owner uses a symmetric key to encrypt a file so as to obtain a file ciphertext, and then, encrypts the symmetric key by using the public key of the data owner so as to obtain a key ciphertext, and the data owner uses the public key of an attribute key pair to perform secondary encryption on the key ciphertext, and stores the file ciphertext and the key ciphertext which has been subjected to secondary encryption to could, wherein the attribute encryption public and private key pair is generated by a proxy re-encryption module; the proxy re-encryption module generates a re-encryption key that authorizes access to the file ciphertext to a data visitor, and writes the re-encryption key and the private key of the attribute encryption public and private key pair into a blockchain; and the data owner writs the access control policy of the file ciphertext into a smart contract. According to the blockchain-based data cloud storage encryption method and system of the embodiments of the invention, the re-encryption technology and the attribute encryption technology are combined, so that the encrypted storage of data files on the cloud can be realized; and the smart contract technology is used to realize the access control of the data on the cloud, and therefore, the privacy and security of the data can be fully guaranteed.

Description

technical field [0001] The present invention relates to the technical field of information security, in particular to a data cloud storage encryption method and system based on blockchain. Background technique [0002] With the continuous advancement of network technology, cloud storage services have been widely used. Through the cloud storage service, users can easily store data to the remote server. To ensure the confidentiality of the data stored in the cloud, the data upload terminal often encrypts the data and stores the encrypted ciphertext on the cloud server. However, in the traditional public key infrastructure, the centralized key management center realizes the key management and distribution of the whole network. If the security of the key center is attacked, it will affect the key security of the whole network and the security of encrypted data. Security poses a major threat, which leads to the inability to ensure the confidentiality of data stored in the cloud....

AI Technical Summary

Problems solved by technology

However, in the traditional public key infrastructure, the centralized key management center realizes the key management and distribution of the whole network. If the security of the key center is attacked,

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