A ring signature scheme can be viewed as a group signature scheme with no anonymity
revocation and with simple group setup. A linkable ring signature (LRS) scheme additionally …

We argue that traditional identity-based systems from pairings seem unsuitable for
designing group signature schemes due to the problem of key escrow. In this paper we first …

Security and anonymity are essential to E-payment systems. However, with the increasing
computing power, existing E-payment systems will gradually become insecure. In this paper …

Several new groupsignature schemes have been proposed in recent years. In addition,
several applications for group signatures (including electronic cash) have been suggested …

Unix systems in many cases record personal data in log files. We present tools that help in
practice to retrofit privacy protection into existing Unix audit systems. Our tools are based on …

On-line auctioning is one of the fundamental services for the new Internet economy. Most
current auction services are public auction where all bids are made available to any party …

We propose an electronic payment (E-payment) protocol with a trusted third-party. Quantum
key distribution protocol, single-particle unitary operation, one-time pad and orthogonal …

A fair electronic cash system is a system that allows customers to make payments
anonymously. Moreover, under certain circumstances, a trusted authority can revoke the …

A third-party E-payment protocol based on quantum group blind signature is proposed in
this paper. Our E-payment protocol could protect user's anonymity as the traditional E …

Based on blockchain and quantum signature, a novel E-payment protocol is proposed in this
paper. Our E-payment protocol could protect user's anonymity as the traditional E-payment …