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How many bits make up the effective length of the DES key?

How many bits make up the effective length of the DES key?

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A.
56

B.
64

C.
32

D.
16

Explanation:
A: DES has a key size of 64 bits, but 8 bits are used for parity, so the true key size is 56 bits. Remember that DEA is the algorithm used for the DES standard, so DEA also has a true key size of 56 bits, because we are actually talking about the same algorithm here. DES is really the standard and DEA is the algorithm. We just call it DES in the industry because it is easier.

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