NSSIA: A New Self-Sovereign Identity Scheme with Accountability
Qiuyun Lyu, Shaopeng Cheng, Hao Li, Junliang Liu, Yanzhao Shen, Zhen, Wang

TL;DR
This paper introduces NSSIA, a novel self-sovereign identity scheme that balances privacy and accountability, eliminates third-party dependence, and enhances user control with biometric embedding and blockchain-based accountability.
Contribution
The scheme uniquely combines biometric-based digital avatars with a joint accountability mechanism using threshold cryptography and blockchain, improving privacy, security, and independence from third-party programs.
Findings
Resists known security attacks
Meets all six SSI properties
Practical costs in storage and blockchain are acceptable
Abstract
Self-Sovereign Identity (SSI) is a new distributed method for identity management, commonly used to address the problem that users are lack of control over their identities. However, the excessive pursuit of self-sovereignty in the most existing SSI schemes hinders sanctions against attackers. To deal with the malicious behavior, a few SSI schemes introduce accountability mechanisms, but they sacrifice users' privacy. What's more, the digital identities (static strings or updatable chains) in the existing SSI schemes are as inputs to a third-party executable program (mobile app, smart contract, etc.) to achieve identity reading, storing and proving, users' self-sovereignty are weakened. To solve the above problems, we present a new self-sovereign identity scheme to strike a balance between privacy and accountability and get rid of the dependence on the third-party program. In our…
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Taxonomy
TopicsCryptography and Data Security · Blockchain Technology Applications and Security · Advanced Steganography and Watermarking Techniques
