The authenticity of public keys in an asymmetric cryptosystem can be gained in two different
ways: either it is verified explicitly after knowing the public key and its certificate, eg X. 509 …

Most anonymous, electronic cash systems are signature-based. A side effect of this is that in
these systems the bank has the technical ability to issue unreported, valid money. It has …

The massive growth of electronic commerce on the Internet heightens concerns over the
lack of meaningful certificate management. One issue limiting the availability of such …

Untraceable electronic cash is an attractive payment tool for electronic-commerce because
its anonymity property can ensure the privacy of payers. However, this anonymity property is …

For the two last decades, people have tried to provide practical electronic cash schemes,
with more or less success. Indeed, the most secure ones generally suffer from inefficiency …

The mystery about the ingenious creator of Bitcoin concealing behind the pseudonym
Satoshi Nakamoto has been fascinating the global public for more than a decade. Suddenly …

There have been many proposals to realize anonymous electronic cash. Although these
systems offer high privacy to the users, they have the disadvantage that the anonymity might …

We propose a fast encryption method for MPEG video which encrypts the sign bits of DC
coefficients and uses a random scan instead of zig-zag one. The proposed algorithm is a …

In the design of electronic cash systems, we usually focus on preventing customers'
malicious behaviors. However, since authorities such as banks and certificate authorities …

In this paper, we design and implement an efficient fair off-line electronic cash system based
on Elliptic Curve Discrete Logarithm Problem (ECDLP), in which the anonymity of coins is …