Abstract
With the rapid development of Internet, e-mail authentication becomes more and more important. However, many existing e-mail authentication protocols are not secure enough. In 2005, Sun et al. proposed two e-mail protocols and claimed that can provide perfect forward secrecy. In 2007, Raphael showed the weaknesses of the two e-mail protocols.The first protocol can?t securely against unknown key-share attack and the second protocol can?t provide the perfect forward secrecy. It was contradictory to Sun et al.?s claimed. Therefore in this paper, we propose a novel e-mail protocol using three-party password authenticated key exchange to conquer the weaknesses of Sun et al.?s protocols.
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