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A non-repudiation protocol aims to provide non-repudiation service. Non-repudiation service, one of the essential security services in computer networks, protects the parties involved in a transaction against the other party denying that a particular event or action took place. Non-repudiation protocols are a special type of fair exchange protocols, and fairness is a key property that must be respected...
A multi-party contract signing (MPCS) protocol allows a set of parties to exchange messages with each other to reach a state in which either each of them has a pre-agreed contract text signed by all the others, or none of them does. A good MPCS protocol should satisfy the properties of fairness, timeliness and abuse-freeness, and at the same time, be concise and efficient. Typical MPCS protocols designed...
A multi-party contract signing (MPCS) protocol allows a set of parties to exchange messages with each other to arrive in a state in which either each of them has a pre-agreed contract text signed by all the others, or none of them does. This paper proposed an improvement on the optimistic MPCS protocol described by Baum-Waidner and Waidner (BW). The number of rounds is reduced to two and the message...
Difficulties in designing multi-party contract signing (MPCS) protocols include providing concise and efficient protocols and at the same time keeping the protocols fair and abuse-free. This paper proposed an optimistic MPCS protocol. The number of rounds is reduced to two and the message transmission number to O(n2), which is the best known so far. Formal definitions of fairness and abuse-freeness...
The paper proposes an efficient identity authentication protocol for mobile commerce based on token. The proposed protocol needs fewer messages to authenticate identities of mobile users called as important entities in the foremost time, as well as session keys used for transaction are negotiated efficiently. To analyze the proposed protocol, the paper also proposes an extension of BAN logic. Using...
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