System and method for supporting flexible revocation and verifiable ciphertext authorization based on CP-ABE

Abstract

The invention provides a CP-ABE-based system and a CP-ABE-based method for supporting flexible revocation and verifiable ciphertext authorization. The CP-ABE-based system supporting flexible revocation and verifiable ciphertext authorization comprises a trusted mechanism, the trusted mechanism is used for managing an attribute set owned by a user and generating a private key corresponding to the attribute set for the user, and the trusted mechanism is also responsible for generating global parameters of the system and an update material at each revocation moment; the trusted mechanism is completely trusted in the system; and the cloud service provider is a third-party platform for providing a cloud storage service, and the cloud service provider is responsible for managing the original ciphertext uploaded to the cloud by the user. The CP-ABE-based flexible revocation and verifiable ciphertext authorization supporting system and method provided by the invention have the advantages that attribute revocation and user revocation can be realized at the same time, the attribute revocation and user revocation cooperate with each other, and an efficient revocation mechanism is realized.

Description

technical field [0001] The invention relates to the technical field of cloud computing, in particular to a CP-ABE-based system and method supporting flexible revocation and verifiable ciphertext authorization. Background technique [0002] In the era of big data, cloud computing, as a new service technology, integrates multiple technologies such as distributed computing, load balancing and network storage, and provides an efficient platform for users to improve their computing and storage capabilities. . [0003] As a hot issue in cloud storage services, data storage security has always been the focus of users. Data security issues mainly include leakage and loss of outsourced data. Under the traditional system architecture, users can actually control their own data and access rights to their own data to ensure the security of their own data. However, in the cloud storage environment, users outsource their own data to a third party, that is, cloud service providers for ma...

AI Technical Summary

Problems solved by technology

That is to say, the cloud server will honestly perform the operations assigned to it, but it will be curious about the stored data, which may cause data leakage

At the same time, we also found that there is another situation, that is, due to the laziness of the cloud service provider itself, the ciphertext that should have been updated when the revocation occurred was not updated in time, and most of the solutions cannot solve this problem

Images