Traceable access control method based on double block chains

Abstract

The invention discloses a traceable access control method based on double block chains, and the method comprises the steps: generating a decryption key, storing a file, storing an access control strategy, carrying out access authorization, carrying out user access, carrying out file decryption, and enabling an initial user to provide own attribute information for registration, thereby obtaining the decryption key; the uploaded file is encrypted and then stored in the IPFS, an intelligent access strategy of attributes is set according to the file, and the file can be accessed only when the intelligent strategy is met; and the accessed file also needs to be decrypted by a decryption key during registration, and when the file is tampered, the access process is checked to search for illegal users, so that more accurate equipment traceability is achieved. According to the method, the unpaired CP-ABE algorithm is adopted to encrypt the uploaded file, and the simple scalar multiplication in the elliptic curve encryption is utilized to replace bilinear pairing, so that the file encryption efficiency is improved; the IPFS is used for storing file data, the risk that a database is attacked is reduced, and the files are prevented from being lost and tampered.

Description

technical field [0001] The invention relates to the field of block chain access control, in particular to a traceable access control method based on dual block chains. Background technique [0002] With the development of information technologies such as cloud computing, the Internet of Things, and big data, various systems and devices distributed in different domains are frequently interconnected, and the access and transfer of data between them has become a trend. In data access and circulation, data security and privacy have become the bottleneck restricting the development of information technology. Access control technology grants certain access rights to legitimate subjects in a specific access environment, and has become the main means to ensure data security and privacy. . [0003] Chinese invention patent CN108123936 discloses an access control method and system based on block chain technology, which combines block chain technology with attribute-based access contr...

AI Technical Summary

Problems solved by technology

[0005] The existing access control methods have the following disadvantages: (1) The access record formed during the access process may be tampered by the visitor, and its credibility cannot be guaranteed; (2) The encryption efficiency of data files is low, and the overall calculation cost is relatively large; ( 3) File data is stored in the cloud database and managed by a third party, which may be easily tampered with and lost; (4) Access control authorization is performed by a third party, the process is not transparent, and it is impossible to determine the credibility of the authorization results of the third-party authorization center

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