Enhancing Certified Email Service for Message Confidentiality

Abstract

Certified email protocols to facilitate secure electronic mail delivery are necessary if the Internet is to achieve its true potential as a communications tool. So, the proposed system is aimed to provide a certified email protocol which guarantees the fairness and confidentiality of the message so that the participants can communicate via email in a fair and secret form and no one else but only the intended user can see the mail content. In order to resolve the disputes and provide fairness, off-line (optimistic) trusted third party (TTP) will be participated in this system. The system is also aimed not to reveal any secret things: the mail content and the key, to TTP so that the importance of its role can be reduced as much as possible. The key security properties of the proposed system are verified using model checking tool, Automated Validation of Internet Security Protocols and Applications (AVISPA).