In Figure 31.9 we have a swapper in each round. What is the use of this swapper?

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Figure 31.9

64-bit plaintext DES 32 bits 32 bits 41 Initial permutation K1 Round I 48-bit f( R1. K ) K; Round i 56-bit 48-bit cipher key K16 Round 16 48-bit Final permutation 32 bits 32 bits Each round 64-bit ciphertext

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Data Communications and Networking

ISBN: 978-0073376226

5th edition

Authors: Behrouz A. Forouzan

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Question Posted: Dec 28, 2018 12:38 PM

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In Figure 31.9 we have a swapper in each round. What is the use of this swapper?

Question:

64-bit plaintext DES 32 bits 32 bits 41 Initial permutation K1 Round I 48-bit f( R1. K ) K; Round i 56-bit 48-bit cipher key K16 Round 16 48-bit Final permutation 32 bits 32 bits Each round 64-bit ciphertext

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DES applies the key and the function fK to only t...View the full answer

Data Communications and Networking

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