Unit 3-Symmetric Key Crypto_Part21

Unit 3-Symmetric Key Crypto_Part21 - Halves are swapped...

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Unit 3 - 41 One Round of DES
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Unit 3 - 42 DES Last Word (Almost) An initial permutation is applied to the plaintext before round one and its inverse is applied after the final round.
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Unformatted text preview: Halves are swapped after last round so the actual ciphertext is (R 16 ,L 16 ) instead of (L 16 ,R 16 ). None of these serve any security purpose...
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This note was uploaded on 03/17/2011 for the course ECE 4472 taught by Professor Ouda during the Fall '10 term at UWO.

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Unit 3-Symmetric Key Crypto_Part21 - Halves are swapped...

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