A Dynamic Searchable Public Key Encryption Method

Abstract

The invention discloses a dynamic searchable public key encryption method, belonging to the technical fields of cryptography and cloud storage. According to the method, functions of generation, retrieval and dynamic updating of ciphertext data in a cloud storage system under a public key encryption mechanism are realized. A sender encrypts key words of a file to generate a searchable ciphertext for (ID, W), a to-be-uploaded file is encrypted to generate a cipertext file with a file ID, and lastly, the searchable ciphertext and the cipertext file are uploaded to a server together. A receiver submits a trap door of a to-be-searched key word W to the cloud storage server, the cloud storage server carries out retrieval to obtain a corresponding searchable ciphertext, the searchable ciphertext is further decrypted to obtain a relevant file ID, and the corresponding cipertext file is found according to the file ID and is returned to a user. The receiver submits a trap door of a to-be-deleted file ID to the server, the server retrieves a cipertext index according to trap door information in order to obtain a corresponding searchable ciphertext index, and then the searchable ciphertext index and the cipertext file corresponding to the file ID are deleted.

Description

technical field [0001] The invention belongs to the security field of cryptography and cloud storage technology, and more specifically relates to a dynamic searchable public key encryption method. Background technique [0002] With the rapid development of Internet technology, a large number of enterprises and individuals choose to store data on cloud servers, and the security issues brought about by cloud storage technology have also attracted people's attention. In order to ensure the security and privacy of the data and prevent the data from being obtained by illegal users, it is a more effective technical means to encrypt the data and store it in the cloud server in the form of ciphertext. However, how users retrieve and obtain specific data from a large amount of ciphertext data stored in cloud servers has become a difficult problem. After the data is encrypted and stored, the ciphertext data loses its previous plaintext structure, and users cannot retrieve the ciphert...

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a dynamic searchable public key encryption algorithm, which solves the problem of dynamic update of ciphertext in the existing searchable public key encryption technology

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