(also S/MIME, Secure/Multipurpose Internet Mail Extensions)
A standard for digitally signing and encrypting email messages. Originally developed by RSA Data Security, SMIME functionality has been since incorporated into most popular email software.
SMIME helps authenticate messages, ensure their integrity, and provide proof of origin. SMIME is based on asymmetric cryptography and protects the content of email messages from surveillance or tampering. SMIME is also an effective anti-phishing measure because it lets senders verify their identity with an advanced digital signature.
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