Practical multi-party non-repudiation protocols must respect viability,fairness,timeliness,exclusion-freeness and confidentiality.

This paper analyzed an existing representative multi-party non-repudiation protocol using formal method and found that it lacks the support for timeliness.

This paper discusses the state-of-the-art of the multi-party non-repudiation protocols,analyzes those papers,and shows the common problem that the originator is positioned in an advantageous way.

Formal analysis of non-repudiation protocols with SVO logic;

A Non-repudiation Protocol with Many Off-line TTPs;

An Non-Repudiation Digital Signature Scheme Both Sender and Receiver;

Forward-secure Undeniable Digital Signature Scheme Based on Zero-knowledge Proof;

An Undeniable RSA Encryption Protocol with Small Public-key for Both Sender and Receiver;

An undeniable cryptographic protocol for both thesender and the receiver;

This new method mainly aim to solving authentication,nonrepudiation,privacy and integrity problems during the course of sending and receiving.

In this paper, the authors demonstrate Chan-Wei scheme does not satisfy strong unforgeablity, strong nonrepudiation and strong identifiability.

The principles for designing electronic commerce protocols such as security, anonymity, atomicity, nonrepudiation and transaction size are introduced.