Labels:text | diagram | screenshot | plan | rectangle | schematic | line | parallel | technical drawing OCR: Plaintext K1 F Ciphertext Figure 2: Two rounds of the DES, the most famous block cipher. It has the Feistel structure. E denotes the linear expansion of the 32 input bits to 48 input bits, @D denotes the bitwise XOR with the round key, S, is the nonlinear Substitution, and 9 is the bit permutation.
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