Supporting S/MIME
Secure/Multipurpose Internet Mail Extensions (S/MIME) is used to digitally sign and encrypt messages. Digital signatures provide authentication, non-repudiation, and data integrity, and encryption keeps message contents confidential.
To support S/MIME, X.509 digital certificates are used. The certificate identifies information about the certificate's owner and includes the owner's public key information. X.509 is the industry standard for digital certificates. The Windows Server 2003 certificate templates that support S/MIME are Exchange User, Exchange Signature Only (for only digital signatures), Smartcard User, and User.
Supporting Digital Signatures
Signing a message generates a random checksum that is added to the message. ...
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