In the current group signature schemes with backward unlinkability and verifier-local revocation (BU-VLR), the size of the public key is linear with the total number of time intervals, and the size of the revocation list (RL) is linear with the total number of time intervals and revoked members.

Aiming at the intrinsic problems in verifier-local revocation group signatures,such as reducing the computational costs,shortening the signature length and so on,a new verifier-local revocation group signature is proposed based on the strong Diffie-Hellman assumption and the decisional tripartite Diffie-Hellman assumption.

A new verifier-local revocation short group signature is proposed by use of bilinear maps based on q-SDH assumption and DTDH assumption.

Research and design of certificate revocation mechanism in the large scale PKI system;

One Scheme for Certificate Revocation in P2P-PKI Network;

Analysis and research mechanism of certificate revocation;

In view of the complexity of certificate verification response and certificate verification in the 2-3 tree for managing revoked certificates, the binary tree is used to replace the 2-3 tree to manage the revoked certificates.

Traditional CRT doesnt take the query frequency of certificates into consideration, and this directly causes the hash path length of all queried responses to be equal.

Four main certificate revocation mechanisms (including CRL, on-line inquiry mechanism, CRS, and CRT) are introduced; then some advantages and disadvantages of every scheme a.