# Auditable Credential Anonymity Revocation Based on Privacy-Preserving Smart Contracts

**Authors:** Rujia Li, David Galindo, Qi Wang  
**arXiv:** [1908.02443](https://arxiv.org/abs/1908.02443)  
**Date:** 2019-08-07  
**Summary page:** https://www.summarizepaper.com/en/paper/1908.02443v2/

## Key points

- Anonymity revocation is crucial in credential issuing systems to prevent misuse of credentials without consequences.
- Current approaches to anonymity revocation have limitations in terms of auditability.
- Rujia Li, David Galindo, and Qi Wang propose a novel approach based on privacy-preserving blockchain-based smart contracts for auditable credential anonymity revocation.
- The proposed solution ensures availability through code self-execution and provides auditability through public ledger immutability.
- The authors conducted evaluations in terms of running time, gas cost, and latency which showed that their scheme is feasible and efficient.
- By leveraging blockchain technology's inherent features such as transparency and immutability, the proposed approach ensures that the revocation process can be audited while maintaining user privacy.
- This paper presents a significant contribution to the field of credential issuing systems by addressing one of its critical challenges - anonymity revocation with auditability.
- The proposed solution has practical implications for various industries where credentials are issued and used regularly.

## Summary

In the field of credential issuing systems, anonymity revocation is a crucial aspect as unconditional anonymity can lead to credential misuse without any consequences. Current approaches to anonymity revocation have limitations when it comes to the auditability of the revocation process. To address this issue, Rujia Li, David Galindo, and Qi Wang propose a novel approach in their paper titled "Auditable Credential Anonymity Revocation Based on Privacy-Preserving Smart Contracts". Their proposed solution is based on privacy-preserving blockchain-based smart contracts that ensure availability through code self-execution and provide auditability through public ledger immutability. The authors describe an instantiation of their approach and provide an implementation thereof. They also conduct a series of evaluations in terms of running time, gas cost, and latency. The results show that their scheme is not only feasible but also efficient. By leveraging blockchain technology's inherent features such as transparency and immutability, their proposed approach ensures that the revocation process can be audited while maintaining user privacy. This paper presents a significant contribution to the field of credential issuing systems by addressing one of its critical challenges - anonymity revocation with auditability. The proposed solution has practical implications for various industries where credentials are issued and used regularly.