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URL:
http://www.ietf.org/rfc/rfc2045.txt,
http://www.ietf.org/rfc/rfc2311.txt
Multipurpose Internet Mail Extensions (MIME)
[RFC2045-RFC2049] is a supplementary protocol and an extension to SMTP.
Originally designed for only e-mail and SMTP as an encoding method for sending
non-ASCII files through e-mail servers, today MIME has been adopted to
also support a way to send non-html documents over the World Wide Web.
MIME provides a way for non-text information to be encoded as ASCII text. This
encoding is known as base64. Web servers now must be configured for MIME types
to serve those types of files. Most e-mail clients automatically handle MIME
now and the process is transparent to the user.
The Secure/MIME (S/MIME) is an IETF specification
[RFC 2311], to send and receive secure MIME data, providing the following
cryptographic security services for electronic messaging applications:
authentication, message integrity and non-repudiation of origin (using digital
signatures) and privacy and data security (using encryption).
Keywords:
Security, Mail, E-mail, Encoding, Internet, Protocol, Application
layer
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