What algorithm was DES derived from?

The correct answer is D. 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 Skipjack. This is…

Submitted by carlos_mx· Apr 18, 2026Cryptography

Question

Options

ATwofish.
BSkipjack.
CBrooks-Aldeman.
DLucifer.

How the community answered

(47 responses)

A
2% (1)
B
2% (1)
C
4% (2)
D
91% (43)

Explanation

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 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.

Topics

#DES#Symmetric Encryption#Cryptographic History#Algorithm Origin

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