S/MIME Version 2

• RFC 2311 – S/MIME Version 2 Message Specification, which is based on . . .

• RFC 2315 – PKCS #7: Cryptographic Message Syntax Version 1.5

  • Public-Key Cryptography Standards (PKCS): specifications begun in 1991 by RSA Laboratories and other industry and academic participants
  • PKCS #7: a general syntax for data that may have cryptography applied to it, e.g., digital signatures
  • defines a “digital envelope for a recipient” :(1) data encrypted in a content encryption key (CEK)(2) CEK encrypted in a second key, known to the recipient

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