Suppose that after performing the Permuted Choice One (PC-1)…
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.