Which of the following standards does S/MIME use?
  1. PKCS #7
  2. PKCS#4
  3. TLS
  4. X.509
Explanation
Answer: A - Secure Multipurpose Internet Mail Extensions (S/MIME) is a standard used for encrypting e-mail. S/MIME contains signature data. It uses the PKCS #7 standard (Cryptographic Message Syntax Standard) and is the most widely supported standard used to secure e-mail communications.

Key Takeaway: S/MIME is a standard for public key encryption and signing of e-mail encapsulated in MIME. It provides the cryptographic security services which include authentication, message integrity, and non-repudiation of origin, privacy, and data security.
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