DEA uses how many rounds and parity bits?
A.
16 rounds and 8 bits
B.
8 rounds and 24 bits
C.
56 bits and 16 rounds
D.
72 rounds and 36 bits
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Believe the answer is C. It isn’t showing up.
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Actually, because its asking for parity bits, the answer should be A.
For DES, the key size is originally 64 bits. But with 8 bits used for parity, the key size becomes 56 bits.
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This question is not showing the answer.
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Admin: Please fix, there is no answer, and the answer should be A. Also the below explains why DES effective key length is 56….
DES is the archetypal block cipher — an algorithm that takes a fixed-length string of plaintext bits and transforms it through a series of complicated operations into another ciphertext bitstring of the same length. In the case of DES, the block size is 64 bits. DES also uses a key to customize the transformation, so that decryption can supposedly only be performed by those who know the particular key used to encrypt. The key ostensibly consists of 64 bits; however, only 56 of these are actually used by the algorithm. Eight bits are used solely for checking parity, and are thereafter discarded. Hence the effective key length is 56 bits, and it is always quoted as such.
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