Efficient User Revocation for Privacy-Aware PKI

Privacy-aware Public Key Infrastructure (PKI) can maintain user access control and yet protect user privacy, which is envisioned as a promising technique in many emerging applications. To justify the applicability of privacy-aware PKI and optimize the performance, it is highly important to en-sure the efficiency of handling user revocations. In practice, user revocation can be due to various predictable and unpredictable reasons, e.g., subscription expiration, network access policy violation, group changing, secret key exposure, etc.