Ciphertext retrieval system and method for supporting proxy re-encryption in combination with identity and attribute

Abstract

The invention discloses a ciphertext retrieval system and method for supporting proxy re-encryption in combination with identity and attribute. The method realizes sharing of a secure and efficient one-to-many user search authority in a cloud environment. The previous identity-based searchable encryption and proxy scheme combines identity-based proxy re-encryption with a searchable encryption scheme to implement agency for a one-to-one search authority. The scheme uses an identity-based encryption method in the initial ciphertext encryption, and adopts an LSSS linear secret shared matrix access structure in the re-encryption phase, which can authorize the ciphertext retrieval authority to other users who conform to the access structure. Therefore, the scheme supports the sharing of a moregranular user search authority and has higher computational efficiency. In the re-encryption threshold generation phase, the user key is blinded by the random value and submitted to a cloud server, ensuring the confidentiality and security of the user key.

Description

technical field [0001] The invention relates to a ciphertext retrieval system and method that combines identity and attributes and supports proxy re-encryption, and belongs to the technical field of cloud computing. Background technique [0002] Cloud computing technology is an important technology in the development of social informatization, and cloud storage technology is a new type of storage technology based on cloud computing technology. Cloud storage technology provides users with storage services through pay-as-you-go and other methods, saving users a lot of local resources. After entering the era of big data, more and more users choose to store data in the cloud. Although cloud storage has brought so many benefits, it also brings many security problems, because uploading data to the cloud deprives the data owner of direct control over private data, while cloud service providers and illegal users (such as hackers) Users who do not have access rights) can try to obt...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem of multi-user granting of search authority that cannot be effectively implemented in the identity-based searchable encryption scheme in the cloud computing environment, the present invention provides a ciphertext retrieval system and method that combines identity and attributes and supports proxy re-encryption

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