A zero-knowledge proof verifiable credential digital identity management system and method based on blockchain smart contracts

Abstract

The invention discloses a zero-knowledge proof verifiable credential digital identity management system and method based on a blockchain smart contract. The system includes a zero-knowledge smart contract and a credential client; the zero-knowledge smart contract includes a credential status smart contract, a zero-knowledge smart contract, and a zero-knowledge smart contract. Evidence uses state smart contracts, zero-knowledge evidence validity verification smart contracts, and verifiable credential validity verification smart contracts; the credential client has three roles: identity provider, user, and service provider. The description program for proving the zero-knowledge problem in the present invention is constructed by the service provider according to the identity attribute requirements of the service. To obtain the service, the user only needs to use the user's attribute certificate to generate zero-knowledge evidence according to the zero-knowledge problem program constructed by the service provider. Submit evidence to the service provider to prove that the attributes in the evidence meet the identity attribute requirements of the service, and at the same time prove that the user is the holder of the generated evidence, thus realizing the dual guarantee of privacy and security.

Description

technical field [0001] The invention belongs to the blockchain technology, in particular to a zero-knowledge proof verifiable credential digital identity management system and method based on a blockchain smart contract. Background technique [0002] The development of Internet technology facilitates people's work, study and life, allowing people to conveniently use various digital identities to obtain services, exchange data and information from different application service providers. However, while people enjoy the convenience brought by various Internet applications, various characteristic information and behavior information associated with people's digital identities are also exposed and stored in the digital identity management systems of various application service providers. This raises cybersecurity issues such as illegal use and leakage of data, identity forgery, extortion and extortion. [0003] In recent years, with the development of blockchain technology, its...

AI Technical Summary

Problems solved by technology

[0007] Although the verifiable credential digital identity architecture based on the blockchain has many advantages, the verifiable credential usually records the plaintext information of the user's identity. Therefore, there is still a risk of privacy leakage when using the verifiable credential for identity authentication and authorization. , even though some studies have suggested that selective disclosure can be used to reduce the degree of privacy leakage, or zero-knowledge proofs can be used to hide identity attributes, but these studies have not given a specific privacy protection implementation architecture, let alone the realization of a shared architecture the code

These architectures still have the above-mentioned problems such as centralized storage and management of digital identities, poor autonomy of digital identities, no guarantee of privacy of digital identities, and non-open and transparent authentication process of digital identities.

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