S/MIME - Secure/Multipurpose Internet Mail Extension
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Internet standard: RFC 2311, RFC 2312; developed by RSA in 1996; IETF is working on version 3
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S/MIME allows users of Web messaging clients (Netscape Messenger) to send encrypted messages and authenticate received messages
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asymmetric encryption: RSA
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symmetric encryption: RC2, Triple DES
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public key size : 1024 bits
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uses X.509v3 certificates to authenticate owner of the public key
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