SMIME FUNCTIONALITIES


S/MIME Functions

 In term of functionalities SMIME is similar to PGP. But offers the ability to sign and encrypt messages

enveloped data

  •   Consists of encrypted content and associated encrypted keys.



Signed data
  • Digital signature is formed by taking message digest of the content and encrypting that with the private key of the signer.
  • i.e; encoded message + encoded signed message digest.

Clear-signed data.
  • clear text message + encoded signed message digest
  • Recipients without S/MIME capability can view the message but cannot verify the signature
Signed and enveloped data
  •  Encrypted data may be signed and signed data or clear signed data may be encrypted
  • Nested signed and encrypted entities



Image result for S/MIME Security Functionality: Simplified View




Hash functions: MD5 & SHA-1
Digital signature: DSS and RSA
Session key encryption: RSA
Message encryption: Triple DES

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