This study presents a formal attack trace on vulnerabilities such as DID-counter linked anonymity leakage in the baseline protocol through re-analysis of a privacy-preserving DID protocol. We propose improvements including enhanced session-key binding, mandatory multi-party trust establishment, blockchain-level token continuity verification, and event-based audit mechanisms. Simulation results confirm that the proposed protocol maintains throughput equivalent to the original while significantly enhancing privacy, auditability, replay detection, and forward secrecy.

Abstract
1. 서 론
2. 관련 연구
3. 방 법
4. 프로토콜 분석
    4.1 기존의 프로토콜 개요
    4.2 식별된 보안 취약점
5. 개선 방안
6. 실험과 평가
7. 결 론
References

• 변해원(Dept. of Future Technology, Korea University of Technology and Education, South Korea) | Haewon Byeon Corresponding author