Cloud storage system and method capable of supporting secure data deduplication and deletion

Abstract

The invention belongs to the technical field of cloud storage, and discloses a cloud storage system and method capable of supporting secure data deduplication and deletion. The method comprises the following technical algorithms: providing secure data deduplication between different users by adopting a deduplication and encryption scheme and a server-assisted network structure; and building secureand efficient data deletion by using an encapsulation key tree. The invention further can support dynamic data updating, namely supporting interpolation, deletion and alteration operation of data inthe system. Efficient data updating is executed by adopting an increment data updating method, and only updated parts are required to be encrypted and uploaded. Through the combination with an increment updating technology, withdrawing/reworking operation of dynamic data is also considered, so that calculation and communication expenses for cloud storage are greatly reduced. Furthermore, detailedsecurity analysis and performance assessment are performed in the method disclosed by the invention. A result shows that the method disclosed by the invention can fulfill an expected security aim andalso realize efficient data deletion and deduplication operation.

Description

technical field [0001] The invention belongs to the technical field of cloud storage, and in particular relates to a cloud storage system and method supporting deduplication and deletion of secure data. Background technique [0002] Cloud storage systems usually maintain sensitive information of users, and the goal of information security is to prevent confidential information from being leaked to unauthorized users. At present, there are already many cryptographic and non-cryptographic methods to protect user data privacy. Assuming that sensitive data of users can be safely deleted within a limited time, and duplicate data can be deduplicated, this requires the storage system to provide safe deletion and deduplication of sensitive data. Current storage systems usually handle data deletion operations from the perspective of efficiency, where data is usually not actually deleted, but is implemented by overwriting old data with new data. Recently, some different methods have...

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Problems solved by technology

[0003] To sum up, the problem existing in the existing technology is: the security models of the two functions of secure data deletion and data deduplication are not compatible with each other

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