Question: In Figure 31.9 we have a swapper in each round. What is the use of this swapper? Figure 31.9 64-bit plaintext DES 32 bits 32

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

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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