Lecture 12 e-mail Security. Summary  PEM  secure email  PGP  S/MIME.

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Presentation transcript:

Lecture 12 Security

Summary  PEM  secure  PGP  S/MIME

PEM integration

PGP Operation – Summary general operation of PGP, and the relationship between the services discussed.

PGP Message Format The format of a transmitted PGP message. A message consists of: 1.the message component, 2.[a signature] 3.[a session key component].

PGP Key Rings  Keys & key IDs are critical to the operation of PGP.  These keys need to be stored and organized in a systematic way for efficient and effective use by all parties.  PGP uses a pair of data structures, one to store the users public/private key pairs - their private-key ring; one to store the users public/private key pairs - their private-key ring; one to store the public keys of other known users - their public- key ring. one to store the public keys of other known users - their public- key ring.  The private keys are kept encrypted using a block cipher, with a key derived by hashing a pass-phrase which the user enters whenever that key needs to be used.  As in any system based on passwords, the security of this system depends on the security of the password, which should be not easily guessed but easily remembered.

PGP Message Generation Key rings are used in message transmission to implement the various PGP crypto services

PGP Message Reception key rings are used in message reception to implement the various PGP crypto services

S/MIME Certificate Processing  S/MIME uses public-key certificates that conform to version 3 of X.509.  The key-management scheme used by S/MIME is in some ways a hybrid between a strict X.509 certification hierarchy and PGP’s web of trust.  S/MIME managers and/or users must configure each client with a list of trusted keys and with certificate revocation lists, needed to verify incoming signatures and to encrypt outgoing messages.  But certificates are signed by trusted certification authorities.

References William Stallings, “Cryptography and Network Security”, 4 th ed.

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