Encryption and decryption method, device and system

CN116471021BActive Publication Date: 2026-07-24HUAZHONG UNIV OF SCI & TECH
View PDF 2 Cites 0 Cited by

Patent Information

Application Number
CN202310386125.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-12
Publication Date
2026-07-24
Estimated Expiration
2043-04-12

AI Technical Summary

Technical Problem

Existing technologies have limitations in their expressive capabilities, making it impossible to flexibly and intuitively control the flow of information during encryption and decryption, to efficiently manage user behavior, and identity-based access control methods require a large amount of storage space.

Method used

An attribute-based encryption method is adopted, which uses a linear secret sharing matrix to represent the access control policy, generates an encryption key and encrypts it in three parts, including ciphertext, rerandomization and zero-knowledge proof, to achieve fine-grained control of information flow.

Benefits of technology

It enables flexible expression of arbitrary access policies, reduces storage space requirements, ensures that information flow complies with access control policies, and improves management efficiency and security.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN116471021B_ABST
    Figure CN116471021B_ABST
Patent Text Reader

Abstract

The application discloses an encryption and decryption method, device and system, and belongs to the technical field of cryptography; considering that each user in the system is assigned with a specified access control strategy and attribute, the access control strategy of the user determines which type of receiver he can send a message to in the encryption process, and the attribute of the user determines which sender he can receive a message from; the application expresses the access control strategy based on a linear secret sharing matrix (LSSS matrix) to realize flexible expression of an arbitrary access strategy and has strong expression capability; on the basis, the application generates an encryption key embedded with a sender access control strategy for the sender, so that the fine-grained control of information flow in the system is realized by assigning corresponding access control strategies and attributes to different users in the communication process, the flow direction of the information flow of the encryption system can be better controlled, and the behavior of the user can be more conveniently and efficiently managed.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Method for realizing timely user attribute cancel based on ciphertext-policy attribute-based encryption

    CN104113408A

  • Data circulation control method based on cleanable attribute encryption in cloud environment

    CN115277171A