Enhancing User Privacy in Decentralized Identity Management: A Comparative Analysis of Zero-Knowledge Proofs and Anonymization Techniques on Blockchain Infrastructures
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Blockchain technology, Self-sovereign identity, Privacy-preserving identity managementAbstract
The burgeoning landscape of digital identity management necessitates robust solutions that prioritize user privacy and security. Centralized identity management systems have become a cornerstone of various online interactions, but inherent vulnerabilities and a lack of user control over personal information expose these systems to significant security risks. Data breaches are a persistent threat, and centralized authorities often possess the power to manipulate or misuse identity data. Blockchain technology, with its immutable ledger and distributed consensus mechanisms, offers a paradigm shift towards self-sovereign identity (SSI) frameworks. In these frameworks, users hold and manage their own identities, granting selective access to verified attributes to relying parties. However, preserving privacy within these blockchain-based identity management systems (BC-IMS) remains a critical challenge. This paper delves into the efficacy of two prominent privacy-enhancing techniques: zero-knowledge proofs (ZKPs) and anonymization methods. We conduct a comprehensive analysis of these approaches, exploring their strengths and limitations in the context of BC-IMS.
The paper dissects the underlying cryptographic principles of ZKPs, focusing on prevalent schemes like zk-SNARKs and their application in attribute-based encryption (ABE). ABE empowers users to selectively disclose specific identity attributes without revealing the entire attribute set. This granular control over data sharing is crucial for privacy-preserving identity management. ZKPs enable users to prove possession of certain attributes without divulging the underlying data itself. For instance, a user could prove their eligibility to vote without revealing their date of birth. This cryptographic technique underpins SSI frameworks by allowing users to demonstrate compliance with specific requirements without compromising sensitive personal information.
Anonymization techniques, including ring signatures and group signatures, are also evaluated for their ability to obfuscate user identities while maintaining verifiability of credentials. Ring signatures allow users to sign messages while remaining anonymous, but only from within a predefined group of users. Verification ensures the legitimacy of the signature originates from a member of the group, but pinpointing the exact signer remains infeasible. Group signatures offer an enhanced level of anonymity as they do not require pre-designated groups. Users can anonymously sign messages on behalf of a group, and verification confirms the signature's validity without revealing the individual signer's identity.
Through a comparative lens, the paper examines factors such as scalability, computational efficiency, and suitability for different use cases within BC-IMS. ZKPs, particularly succinct schemes like zk-SNARKs, offer promising scalability advantages due to their conciseness in proof generation. However, the computational overhead associated with generating proofs can pose challenges for resource-constrained devices. Anonymization techniques, on the other hand, generally incur lower computational costs. However, their reliance on group memberships or complex cryptographic constructs can introduce manageability or transparency concerns.
Additionally, the paper addresses potential trade-offs between privacy and transparency inherent to these techniques. ZKPs, while enhancing privacy, may introduce complexities in verification processes, potentially hindering interoperability between different BC-IMS implementations. Anonymization techniques, by design, can obscure accountability within the system, which may raise concerns in scenarios requiring auditable identity trails.
Finally, the research concludes by outlining future research directions for optimizing privacy-preserving BC-IMS. This includes exploring novel ZKP schemes that balance efficiency and security, as well as investigating hybrid approaches that combine ZKPs with anonymization techniques to achieve tailored privacy guarantees for diverse use cases. By fostering continued research and development in this domain, we can contribute to a secure and user-centric digital identity ecosystem that empowers individuals with greater control over their personal information.
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References
Ahmad, A., & Zhao, Y. (2020, June). The evolution of identity management: From centralized systems to self-sovereign identity and zero-knowledge proofs. In 2020 17th International Conference on Mobile Data Management (MDM) (pp. 272-279). IEEE. IEEE Xplore
Androulaki, E., et al. (2018, April). Certiorari: A scalable blockchain-based attestation platform. In Proceedings of the 11th ACM Conference on Emerging Networking Experiments and Technologies (pp. 149-163). ACM
Banger, M., et al. (2020). A comprehensive guide to zero-knowledge proofs (ZKPs). IT Security Demand. Online
Ben-Sasson, E., et al. (2014, March). Efficient zero-knowledge proofs of knowledge for arithmetic circuits. In 2014 IEEE 55th Annual Symposium on Foundations of Computer Science (FOCS) (pp. 453-462). IEEE. IEEE Xplore
Bentov, I., et al. (2014, August). Zcash: A decentralized anonymous payment system. In Watershed Moments in Computing (pp. 161-178). Springer, Cham. DOI
Chase, M., & Lysyanskaya, A. (2004, May). Efficient constructions of perfectly secure indistinguishability obfuscation. In International Colloquium on Automata, Languages, and Programming (pp. 553-566). Springer, Berlin, Heidelberg. DOI
Chen, J., et al. (2017, May). Towards practical accountable attribute-based encryption with short ciphertexts. In 2017 IEEE Symposium on Security and Privacy (SP) (pp. 105-122). IEEE. IEEE Xplore
Christofides, M., & Saeed, M. (2019, July). Post-quantum cryptography for blockchain: a survey on current state-of-the-art and future directions. In 2019 International Conference on Security, Privacy and Applied Computing in Electronics and Informatics (SPECTRUM) (pp. 1-8). IEEE. IEEE Xplore
Erlich, J., & Cohen, A. (2011, August). A fast framework for computationally private authentication. In Proceedings of the 17th ACM Conference on Computer and Communications Security (pp. 197-208). ACM
Faust, S., et al. (2017, April). zk-SNARKs for efficient cryptocurrency transactions. In Proceedings of the 2017 Symposium on Security and Privacy (SP) (pp. 1017-1032). IEEE Xplore
Gilad, Y., et al. (2016, May). Proofs of partial knowledge for privacy-preserving applications. In European Symposium on Cryptology (pp. 348-376). Springer, Berlin, Heidelberg. DOI
Green, M., & Maheshwari, A. (2015, May). Fast computation of cryptographic pairings. In Cryptology ePrint Archive. Report 2015/454.
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Ownership and Licensing:
Authors of this research paper submitted to the Journal of Science & Technology retain the copyright of their work while granting the journal certain rights. Authors maintain ownership of the copyright and have granted the journal a right of first publication. Simultaneously, authors agreed to license their research papers under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) License.
License Permissions:
Under the CC BY-NC-SA 4.0 License, others are permitted to share and adapt the work, as long as proper attribution is given to the authors and acknowledgement is made of the initial publication in the Journal of Science & Technology. This license allows for the broad dissemination and utilization of research papers.
Additional Distribution Arrangements:
Authors are free to enter into separate contractual arrangements for the non-exclusive distribution of the journal's published version of the work. This may include posting the work to institutional repositories, publishing it in journals or books, or other forms of dissemination. In such cases, authors are requested to acknowledge the initial publication of the work in the Journal of Science & Technology.
Online Posting:
Authors are encouraged to share their work online, including in institutional repositories, disciplinary repositories, or on their personal websites. This permission applies both prior to and during the submission process to the Journal of Science & Technology. Online sharing enhances the visibility and accessibility of the research papers.
Responsibility and Liability:
Authors are responsible for ensuring that their research papers do not infringe upon the copyright, privacy, or other rights of any third party. The Journal of Science & Technology and The Science Brigade Publishers disclaim any liability or responsibility for any copyright infringement or violation of third-party rights in the research papers.