ISC SSCP Question Answer
What algorithm was DES derived from?
Twofish.
Skipjack.
Brooks-Aldeman.
Lucifer.
NSA took the 128-bit algorithm Lucifer that IBM developed, reduced the key size to 64 bits and with that developed DES.
The following answers are incorrect:
Twofish. This is incorrect because Twofish is related to Blowfish as a possible replacement for DES.
Skipjack. This is incorrect, Skipjack was developed after DES by the NSA .
Brooks-Aldeman. This is incorrect because this is a distractor, no algorithm exists with this name.
TESTED 15 Jul 2025
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