Cloud storage data integrity service signature method

Abstract

The invention relates to a cloud storage data integrity service signature method. The method includes the steps of cloud storage server key parameter initialization, file block signature preprocessing and data integrity service. According to the method, a cloud storage server generates a randomly-selected key x which belongs to Z<*>q and calculates Y=xP; the cloud storage server generates center open system parameters {G1, G2, P, Y, q, e, H1, H2}; the cloud storage server divides a user file into n blocks, and a file block mi (i belongs to [1, n]) is formed, and then generates signature information si (i belongs to [1, n]) for the file block mi (i belongs to [1, n]) through the signature key x; a file mark F<*> of which the integrity is to be detected is inputted, and a file block mj (j belongs to [1, n]) contained by a file F is randomly selected so as to be detected, and if a detection result satisfies a verification check formula described in the descriptions of the invention, verification is successful, and data integrity service passage is enabled, otherwise, verification fails. With the method of the invention adopted, service efficiency can be improved; and integrity services are completed in the cloud storage server, so that the computation quantity and communication overhead of a client can be reduced.

Description

Technical field: [0001] The invention relates to the technical field of cloud storage information security, in particular to a cloud storage data integrity service signature method. Background technique: [0002] The data integrity service is mainly to verify whether the cloud storage server can correctly save the data stored by the user, and prevent cloud data from being lost, deleted or tampered with. For the problem of cloud storage data integrity detection, that is, provable storage, the usual practice is that cloud users retrieve a small amount of data stored in the cloud, and use knowledge proof protocols or probabilistic analysis methods to judge whether the data stored in the cloud is correct or not with a high confidence probability. whole. Typical technologies include: Juel of RSA Labs and Kaliski of EMC, etc. proposed a proof of recovery in 2007. The main idea of ​​this scheme is to randomly insert some values ​​(tag blocks) into the stored data, then store them...

AI Technical Summary

Problems solved by technology

[0004] Judging from the current research situation, cloud storage data integrity detection has the following deficiencies: the calculation of verification information requires more complex signature operations and data structures, performance needs to be improved, and the client needs to participate in the integrity detection process. Too many calculations increase the customer's calculation and communication overhead, which is not suitable for the architecture of the cloud platform

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