An Efficient and Robust Dynamically Searchable Symmetric Encryption Method and System

Abstract

The invention discloses an efficient and robust dynamically searchable symmetric encryption method and system, belonging to the field of cloud storage security, including: for any keyword w, obtain the key used in the latest operation associated with it at the retrieval client Information and the corresponding ciphertext index L' and trapdoor T' to generate the ciphertext of the current operation and send it to the retrieval server, so as to store it in the ciphertext database; the ciphertext meta information of the generated ciphertext includes L ’ and T’; the ciphertext meta-information of the deletion operation ciphertext also includes the deletion credential; the key information is updated when the retrieval ciphertext is generated, and the ciphertext meta-information also includes the difference between the previous retrieval operation and the key used in the current retrieval operation To update the credentials between, send L' and T' while sending the retrieval ciphertext; at the retrieval server, obtain all the ciphertexts associated with the keyword w, delete the ciphertexts that need to be deleted, and send the result set to the retrieval client. The invention can improve the robustness of the searchable symmetric encryption method.

Description

technical field [0001] The invention belongs to the field of cloud storage security, and more specifically relates to an efficient and robust dynamically searchable symmetric encryption method and system. Background technique [0002] Data outsourcing storage is a new trend after the development of cloud computing and cloud storage technology to a certain extent, it can provide users with convenient access to data and safe backup. In the outsourced storage scenario, as long as there is Internet, users can access their files anytime and anywhere, and they don’t need to worry about data loss caused by damage to their local devices. Therefore, people are now more and more inclined to use outsourced data storage technology. [0003] In data outsourcing storage, data privacy and security are very important, and the data uploaded by users often contains secret information that you do not want others to know. At this point, it is necessary to encrypt the data to protect the plaint...

AI Technical Summary

Problems solved by technology

For example, in the process of using, the user may delete a keyword that does not exist, or delete a keyword repeatedly, or delete this keyword before adding a keyword, for security and confidentiality Considering these errors, traditional searchable symmetric encryption methods cannot detect these errors, and these errors may be fatal to the ciphertext retrieval process. In severe cases, user data will be damaged and normal retrieval cannot be performed.

In general, the robustness of existing searchable symmetric encryption methods cannot be guaranteed

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