In DES, the first step of driving subkey is to perform the Permuted Choice One (PC-1) defined in Table C.3(a). For the following 64-bit key, perform the PC-1 to reduce it from 64 bits to 56 bits.       1 1 1 1 1 1 1 0       1 1 0 1 1 1 0 0       1 0 1 1 1 0 1 0       1 0 0 1 1 0 0 0       0 1 1 1 0 1 1 0       0 1 0 1 0 1 0 0       0 0 1 1 0 0 1 0       0 0 0 1 0 0 0 0

Suppose that after performing the Permuted Choice One (PC-1) defined in Table C.3(a), you obtain the following 56-bit (8 rows and 7 columns) binary string, which is divided into two 28-bit substrings: C0 and D0. Question8_1.jpg You then perform the left shift the first 28 bits C0 (rows 1-4) and next 28 bits D0 (rows 5-8) based on Table C.3(d). For the first round of DES, both C0 and D0 just rotate to the left one round. You get the following 56-bit binary string:                                               0 0 0 1 1 1 1                             0 0 1 1 0 0 1                     1 0 1 0 1 0 1                     0 1 1 1 1 1 0                     1 0 1 0 1 0 1                     0 0 1 1 0 0 1                     1 0 0 0 0 1 1                     1 1 1 1 1 1 0 Perform Permuted Choice Two (PC-2) to reduce the 56-bit binary string into 48-bit binary string (organized into a matrix of 6 by 8). This is the first subkey K1.

What’s the difference between a block cipher and a stream cipher?

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