Auditable Credential Anonymity Revocation Based on Privacy-Preserving Smart Contracts
This addresses the need for auditable revocation in credential systems to prevent misuse, offering a domain-specific solution.
The paper tackles the problem of ensuring auditability in credential anonymity revocation by proposing a novel approach based on privacy-preserving blockchain smart contracts, with results showing feasibility and efficiency in terms of running time, gas cost, and latency.
Anonymity revocation is an essential component of credential issuing systems since unconditional anonymity is incompatible with pursuing and sanctioning credential misuse. However, current anonymity revocation approaches have shortcomings with respect to the auditability of the revocation process. In this paper, we propose a novel anonymity revocation approach based on privacy-preserving blockchain-based smart contracts, where the code self-execution property ensures availability and public ledger immutability provides auditability. We describe an instantiation of this approach, provide an implementation thereof and conduct a series of evaluations in terms of running time, gas cost and latency. The results show that our scheme is feasible and efficient.