An evenhanded certified email system for contract signing

Authors:
Kenji Imamoto;Jianying Zhou;Kouichi Sakurai
Affiliations:
Information Science and Electrical Engineering, Kyushu University, Fukuoka, Japan;Institute for Infocomm Research, Singapore;Information Science and Electrical Engineering, Kyushu University, Fukuoka, Japan
Venue:
ICICS'05 Proceedings of the 7th international conference on Information and Communications Security
Year:
2005

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Abstract

Certified email is a system which enables a sender to prove a receiver’s receipt of email. Such a system can be used for applications related to electronic commerce on the Internet. This paper considers a situation where a sender or a receiver wants to change his/her mind due to the change of mail content value (e.g., stock, auction, gambling) during the transaction. We point out that no traditional certified email systems have been designed for such a case, thus one of the participants can be at a disadvantage. To avoid this problem, we propose an evenhanded certified email system in which each participant can change his/her choice, either cancel or finish the transaction, at any time during the transaction.