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Symmetric-Key Cryptography CS 161: Computer Security Prof. Vern Paxson TAs: Devdatta Akhawe, Mobin Javed & Matthias Vallentin http://inst.eecs.berkeley.edu/~cs161/ March 10, 2011 M 1 M 2 M 3 C 1 C 2 C 3 C 2 C 3 C 1 M 1 M 2 M 3 Original

  1. Symmetric-Key Cryptography CS 161: Computer Security Prof. Vern Paxson TAs: Devdatta Akhawe, Mobin Javed & Matthias Vallentin http://inst.eecs.berkeley.edu/~cs161/ March 10, 2011

  5. M 1 M 2 M 3 C 1 C 2 C 3

  6. C 2 C 3 C 1 M 1 M 2 M 3

  7. Original image

  8. Encrypted with ECB

  9. M 1 M 2 M 3

  10. M 1 M 2 M 3

  11. Original image

  12. Encrypted with CBC

  13. (Nonce = Same as IV)

  14. (Note, uses block cipher’s encryption functionality, not decryption)

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