A privacy-preserving attribute-based encryption method and system that supports user revocation

Abstract

The invention discloses an attribute-based encryption method and an attribute-based encryption system capable of protecting privacy and supporting user Undo. The attribute-based encryption system comprises eight modules including a Setup module, a KeyGen module, an Encrypt module, a Decrypt module, a ReKey module, a TKGen module, a TK-Encrypt module and a TK-Decrypt module. Moreover, the method provided by the invention can solve the problem of privacy protection in cloud computation, and support user Undo and safe outsourcing operations to a ciphertext. Meanwhile, a function of authentication to transformed ciphertext is provided, illegal substitution of the transformed ciphertext and adverse consequences caused by illegal substitution are prevented, and system flexibility is high.

Description

technical field [0001] The invention belongs to the field of information security, and relates to an attribute-based encryption technology, in particular to an attribute-based encryption method that supports user revocation, protects user privacy, supports data outsourcing, and supports verification of the correctness of converted ciphertexts . Background technique [0002] Today, in the information age where computers are widely used, due to the vigorous development of network technology and the concept of cloud computing, it has become a trend to store a large amount of information in digital form in public clouds and computer systems. Information is transmitted through public channels, and these systems and public channels are vulnerable to attacks and damage if they are not protected. If the theft of information is not easy to be found, the consequences will be quite serious. With the development of cloud computing technology today, people's concerns about the security ...

AI Technical Summary

Problems solved by technology

[0015] In today's era, data in the cloud is increasingly accessed by resource-constrained wireless end users. For wireless users, computing costs and communication costs are the first factors to be considered. The cost of battery consumption and communication caused by a large number of bilinear pairing operations is uneconomical, so outsourcing part of the calculation to the cloud storage provider for operation has great economics and good system scalability and accessibility

In real life, there may be misconduct on the cloud or malicious attacks on the cloud. The correctness of the converted ciphertext cannot be verified, and the ciphertext is illegally replaced, resulting in adverse consequences.

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