Abstract. In this paper we consider a new and efficient optimistic nonrepudiation protocol. In a non-repudiation protocol, during which Alice wants to transmit a message to Bob, Al...
We deal with two claws of Zhou-Gollmann's fair nonrepudiation protocol. Firstly, their protocol divides a message into 2 parts, i.e., a key K and a ciphertext C. Then, C is d...
In the business world, exchange of signatures or receipts is a common practice in case of future dispute. Likewise, it is critical in E-commerce applications to have the security ...
In this paper, we propose a new practical fair exchange protocol allowing the exchange of an electronic item against a signature. The protocol is based on the Guillou-Quisquater s...
In this paper we consider the optimistic approach of the non-repudiation protocols. We study a non-repudiation protocol with off-line trusted third party and we keep on with the de...