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DES additional slides (to replace Slide 17 of (B) Week 5)

DES additional slides (to replace Slide 17 of (B) Week 5) -...

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DES Round Structure—Decryption Essentially the same as the Encryption Procedure Swap left and right Use the keys K i in the reversed order. You begin with L n , R n and swap them to get the input for Round 1, i.e. R n , L n and the output is supposed to be The output of Round 1 is supposed to be: R n- 1 , L n- 1 L n , R n f L
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Unformatted text preview: f L n , K n ( ) DES Round Structure—Decryption L n , R n ⊕ f L n , K n ( ) R n − 1 L n − 1 ⊕ f R n − 1 , K n ( ) R n − 1 , L n − 1 ⊕ f R n − 1 , K n ( ) ⊕ f L n , K n ( ) R n − 1 , L n − 1 ⊕ f L n , K n ( ) ⊕ f L n , K n ( ) This part is always 0: what is 01001 + 01001?...
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