A member relationship predicate encryption method for privacy protection of intelligent legal contract

By using a bilinear pair-based membership relation predicate encryption method, the problems of fine-grained access control and dynamic permission management in smart legal contracts are solved, achieving privacy protection and efficient permission management when membership relations change in a blockchain network.

CN122247664APending Publication Date: 2026-06-19UNIV OF SCI & TECH BEIJING +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Filing Date
2026-03-06
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

Existing technologies cannot effectively achieve fine-grained access control, dynamic permission management, and privacy protection in smart legal contracts, especially when member relationships change dynamically in blockchain networks, resulting in privacy leaks and inefficient permission management.

⚗Method used

A membership relation predicate encryption method based on bilinear pairing is adopted. The master public key and master private key are generated through system initialization, and the member private keys are dynamically generated. A dynamic member management mechanism is designed to achieve clause-level privacy protection and access management.

🎯Benefits of technology

It enables fine-grained access control to legal contracts in the blockchain network, supports dynamic management of frequent member changes, ensures privacy protection and forward security of permissions, and reduces computational and communication overhead.

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Abstract

This invention discloses a method and apparatus for encrypting member relation predicates for privacy protection in smart legal contracts, relating to the field of information security encryption technology. The method includes: generating parameters using a system initialization algorithm based on bilinear group theory, according to security parameters and an attribute set; generating member private keys using a master private key, an attribute set, and a hash function; updating keys using a dynamic member management algorithm based on member change events, according to changed member attributes, a master public key, a master private key, an attribute set, and a hash function; encoding a strategy using a preset large language model based on the legal contract text and the attribute set to obtain a structured contract data list; and encrypting the structured contract data list, the master public key, and the hash function using an encryption algorithm to obtain the contract ciphertext and the encapsulated secret. This invention is a member relation predicate encryption method with strong predicate expression and efficient key management for privacy protection in smart legal contracts.
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