Recently, Sun et al., proposed a practical E-mail protocol providing perfect forward secrecy, but Dent showed that their protocol does not actually provide perfect forward secrecy. In this letter, we propose two new robust E-mail protocols, which indeed guarantee perfect forward secrecy
['Bum Han Kim', 'Jae Hyung Koo', 'Dong Hoon Lee']
Robust E-mail protocols with perfect forward secrecy