زهرا كاوياني

Abstract: In today's digital world, the authentication and management of user identities have become indispensable. Blockchain, a revolutionary tool, has decentralized existing models and garnered attention from both academia and industry. However, widespread adoption in everyday life remains elusive. Decentralized models encountered challenges pertaining to security, efficiency, flexibility, and computational overhead, exposing a gap in current research: the need for practical models in blockchain networks. To address this gap, our study proposes an innovative, privacy-preserving, and lightweight scheme. This scheme not only ensures user privacy but also enables the detection and revocation of credentials for malicious users. We have developed a system that utilizes zero-knowledge proofs and Merkle Trees, effectively reducing the overhead time for credential generation and verification. Moreover, our scheme is applicable to various use cases. To validate the effectiveness of our proposed scheme, we conducted extensive experimental eva‎luations using a blockchain network. The results demonstrate a reduction in proof generation and verification time and cost, notwithstanding the inclusion of several additional features to enhance security and flexibility when compared to traditional models. Our contribution fills a critical research void by offering a scalable and secure solution for decentralized identity management systems. Furthermore, our model can be deployed in diverse applications beyond financial needs. In addition to verifying age or deposit amounts, user authentication often necessitates the submission of more comprehensive personal documentation, such as passports or driver's licenses, particularly in scenarios where users seek certificates or access to sensitive services on websites or applications. As such, authentication models must exhibit flexibility to accommodate diverse authentication requirements encountered in everyday applications. This adaptability ensures that users can securely access the services they require while safeguarding the confidentiality and integrity of their personal information.

احراز هويت , حريم خصوصي , زنجيره ‌بلوكي , گواهيهاي ناشناس

Blockchain technology , Identity management , Accountability , Credential

Zahra Kaviani

Dr. Farzan Haddadi