Lightweight access control system and method based on block chain

Abstract

The invention provides a lightweight access control system and method based on a block chain, and relates to the technical field of block chains, and the method comprises the steps: an identity authority module carries out the initialization of the system, and generates an attribute token for a data requester; the data manager encrypts original data through a symmetric key and uploads a data ciphertext to the cloud server; performing attribute encryption on the symmetric key, and uploading an attribute ciphertext to a block chain module; the data requester converts the attribute token into a pre-decryption token, uploads the pre-decryption token to a block chain module, initiates a data access request and obtains a pre-decryption result; verifying the pre-decryption result to obtain a symmetric key; downloading the data ciphertext, and decrypting to obtain original data; and the block chain module receives the data access request, performs pre-decryption based on the pre-decryption token and the attribute ciphertext, and generates a pre-decryption result. According to the invention, bilinear pairing operation with high overhead in a traditional model is outsourced to the block chain for execution, so that the computing pressure of a user side is reduced, and lightweight access control is realized.

Description

technical field [0001] The invention relates to the technical field of blockchain, and relates to a lightweight access control system and method based on blockchain. Background technique [0002] In the traditional ciphertext-policy-based attribute encryption (CP-ABE) model, the data manager embeds the access structure in the ciphertext, and the key possessed by the data requester is associated with the attribute set if and only if the key associated with the key is associated with the set of attributes. Decryption succeeds only when the attribute set matches the access structure of the ciphertext. [0003] At present, in the environment with limited device performance, the traditional model has great limitations. Since the decryption process is implemented based on bilinear pairing, and the operation cost of bilinear pairing is high, it is difficult for performance-constrained devices to implement Efficient decryption. SUMMARY OF THE INVENTION [0004] In view of the ab...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a lightweight access control system and method based on blockchain, which solves the problem of high data request end overhead in the traditional model and realizes lightweight access control

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