S/MIME Version 3

• RFC 2633 – S/MIME Version 3 Message Specification, which is based on . . .

• RFC 2630 – Cryptographic Message Syntax

  • enhancements to PKCS #7
  • adds attribute certificates, key agreement methods
  • adds encapsulation syntax for data protection
  • adds multiple, nested encapsulations

• S/MIME uses three of the CMS data types

  • enveloped data
  • signed data
  • just plain data

• S/MIME adds signed and unsigned attributes

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