C.V.Raman Group of Institution
E-mail is one of the most commonly used communication mechanisms. Most of the recipients and senders desire secure e-mail exchange. Senders want to make sure that the recipient is really the intended recipient, and the message arrives to the recipient confidentially. On the other hand, recipients want to make sure that the sender is the entity who it claims to be, and they arrived message has not been maliciously modified and examined during transmission. These requirements can be satisfied by the e-mail applications that use Public Key Cryptosystem (PKC) as the security base, such as S/MIME and PGP.