DES has a key space of what?
A . 2^128
B. 2^192
C. 2^64
D. 2^56
Answer: D
Explanation:
2^56
https://en.wikipedia.org/wiki/Data_Encryption_Standard
The Data Encryption Standard (DES) is a symmetric-key algorithm for the encryption of
digital data. Although its short key length of 56 bits makes it too insecure for applications, it has been highly influential in the advancement of cryptography.
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