Abstract
Electronic mail, E-mail in short, has been used to transfer various types of electronic data on Internet. In order to deliver the E-mail from the sender to the receiver both efficiently and securely, the E-mail system usually employs both conventional and public key cryptographic systems. The basic protection in an E-mail system is to encrypt the bulk mail using a conventional cryptosystem with a short-term key and to protect the short-term key using a public-key cryptosystem with the receiver's public key. However this protection cannot provide perfect forward secrecy because once the receiver's secret key is disclosed, all previous used short-term keys will also be opened and hence all previous E-mails will be learned. Two new E-mail protocols providing perfect forward secrecy are proposed In this work.
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