A structured encryption method and system for equality testing based on a cloud service platform

Abstract

The invention discloses a structured encryption method and system for performing equality testing based on a cloud service platform. The method is as follows: system initialization, generation of system parameters, and disclosure of the system parameters; users generate their own keys according to the system parameters, including public keys and private keys. key; the message sender uses the system parameters and the public key of the target user to perform structured encryption on the structured message, generates the ciphertext of the structured message, and uploads the ciphertext to the cloud server; when the value of a certain field in the ciphertext needs to be When the value of the corresponding field in the ciphertext of other users is tested for equality, the user uses his private key to perform structured authorization on the field to be tested in the ciphertext, generates an authorization trapdoor for the field in the ciphertext, and uploads the authorization trapdoor to the cloud Server; after receiving the ciphertext and authorization trapdoor from different users, the cloud server extracts the message corresponding to the field to be tested in the user ciphertext according to the authorization trapdoor of different users without restoring the plaintext information and performs equality test.

Description

technical field [0001] The present invention relates to the technical field of data encryption, and more specifically, to a structured encryption method and system for performing equality testing based on a cloud service platform. Background technique [0002] At present, cloud computing provides users with required computing services by distributing computing tasks on a resource pool composed of a large number of computers, thus becoming an emerging business computing model. Under the catalysis of cloud computing, more and more cloud service platforms have begun to provide enterprises and service providers with a wide range of global computing, data storage, analysis, deployment and application services to help users save IT costs and improve operational efficiency. However, with the development of big data mining and other data analysis technologies, user privacy such as personal medical information, corporate business secrets, and personal behavior habits contained in the...

AI Technical Summary

Problems solved by technology

However, in the existing public key encryption methods that support equality testing, for structured messages, it is impossible to perform equality testing on structured messages while protecting the confidentiality of the messages, that is, it is impossible to decrypt the ciphertext. The field value of a specific field in the ciphertext encrypted by different public keys is tested for equality, which is not suitable for the actual application scenario of the cloud service platform

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