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Data encryption standard is the most widely used block cipher with the block size of 6 4 - bit intext and 6 4 - bit

Data encryption standard is the most widely used block cipher with the block size of

64 -

bit intext and

64 -

bit key for

16

rounds. Assume that, the plaintext after the Expansion function in d three is obtained as

0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011

and

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