Zero-knowledge proof verifiable certificate digital identity management system and method based on block chain smart contract

Abstract

The invention discloses a zero-knowledge proof verifiable certificate digital identity management system and method based on a block chain smart contract. The system comprises a zero-knowledge smart contract and a certificate client. The zero-knowledge smart contract comprises a voucher state smart contract, a zero-knowledge evidence use state smart contract, a zero-knowledge evidence validity verification smart contract and a verifiable voucher validity verification smart contract; the voucher client is provided with three roles: an identity provider, a user and a service provider. The description program for proving the zero-knowledge problem is constructed by the service provider according to the identity attribute requirement of the service, and the user only needs to generate the zero-knowledge evidence according to the zero-knowledge problem program constructed by the service provider and the attribute voucher of the user and submits the evidence to the service provider to obtain the service. And the attribute in the evidence is proved to meet the identity attribute requirement of the service, and meanwhile, the user is proved to be the holder of the generated evidence, so that the dual guarantee of privacy and security is realized.

Description

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

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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