Cryptanalysis of a Non-Interactive Deniable Authentication Protocol Based on Factoring

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Executive Summary

A deniable authentication protocol allows a sender to transfer an authenticated message to a receiver in such a way that the receiver cannot prove to a third party about the source of the message. In recent years, many deniable authentication protocols have been proposed. In 2005, Lu et al. proposed a secure and non-interactive deniable authentication protocol based on factoring. Although Lu et al. claimed that their protocol could provide complete security and properties of a deniable authentication protocol, the authors will point out that Lu et al. protocol is unable to achieve the second requirement of being the deniable authentication protocol.

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