Introducing proxy zero-knowledge proof and utilization in anonymous credential systems

Most of the existing identity management is the centralized architecture that has to validate, certify, and manage identity in a centralized approach by trusted authorities. Decentralized identity is causing widespread public concern because it enables to give back control of identity to clients, and the client then has the ability to control when, where, and with whom they share their credentials. A decentralized solution atop on blockchain will bypass the centralized architecture and address the single point of the failure problem. To our knowledge, blockchain is an inherited pseudonym but it cannot achieve anonymity and auditability directly. In this paper, we approach the problem of decentralized identity management starting from the designated-verifier anonymous credential (DVAC in short). DVAC would assist to build a new practical decentralized identity management with anonymity and auditability. Apart from the advantages of the conventional anonymous credential, the main advantage of the proposed DVAC atop blockchain is that the issued cryptographic token will be divided into shares at the issue phase and will be combined at the showing credential phase. Further, the smooth projective hash function ( SPHF in short) is regarded as a designated-verifier zero-knowledge proof system. Thus, we introduce the SPHF to achieve the designated verifiability without compromising the privacy of clients. Finally, the security of the proposed DVAC is proved along with theoretical and experimental evaluations.

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Exploiting Pairing-Based Zero Knowledge Proof (ZKP) for Tactical Network Authentication

10.21236/ada558415 ◽

2012 ◽

Author(s):

Kui Ren

Keyword(s):

Zero Knowledge ◽

Network Authentication ◽

Zero Knowledge Proof

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Zero-Knowledge Proof-of-Identity: Sybil-Resistant, Anonymous Authentication on Permissionless Blockchains and Incentive Compatible, Strictly Dominant Cryptocurrencies

SSRN Electronic Journal ◽

10.2139/ssrn.3392331 ◽

2019 ◽

Author(s):

David Cerezo Sánchez

Keyword(s):

Zero Knowledge ◽

Anonymous Authentication ◽

Incentive Compatible ◽

Zero Knowledge Proof

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An access control model for the Internet of Things based on zero-knowledge token and blockchain

EURASIP Journal on Wireless Communications and Networking ◽

10.1186/s13638-021-01986-4 ◽

2021 ◽

Vol 2021 (1) ◽

Author(s):

Lihua Song ◽

Xinran Ju ◽

Zongke Zhu ◽

Mengchen Li

Keyword(s):

Internet Of Things ◽

Access Control ◽

Single Point ◽

Control Model ◽

Third Party ◽

Security Level ◽

Zero Knowledge ◽

Access Control Model ◽

Test Analysis ◽

Zero Knowledge Proof

AbstractInformation security has become a hot topic in Internet of Things (IoT), and traditional centralized access control models are faced with threats such as single point failure, internal attack, and central leak. In this paper, we propose a model to improve the access control security of the IoT, which is based on zero-knowledge proof and smart contract technology in the blockchain. Firstly, we deploy attribute information of access control in the blockchain, which relieves the pressure and credibility problem brought by the third-party information concentration. Secondly, encrypted access control token is used to gain the access permission of the resources, which makes the user's identity invisible and effectively avoids attribute ownership exposure problem. Besides, the use of smart contracts solves the problem of low computing efficiency of IoT devices and the waste of blockchain computing power resources. Finally, a prototype of IoT access control system based on blockchain and zero-knowledge proof technology is implemented. The test analysis results show that the model achieves effective attribute privacy protection, compared with the Attribute-Based Access Control model of the same security level, the access efficiency increases linearly with the increase of access scale.

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