SSCP Question #642: Real Exam Question with Answer & Explanation

The correct answer is C: Blowfish. Blowfish is a symmetric block cipher with variable-length key (32 to 448 bits) designed in 1993 by Bruce Schneier as an unpatented, license-free, royalty-free replacement for DES or IDEA. See attributes below: Block cipher: 64-bit block Variable key length: 32 bits to 448 bits De

Submitted by eva_at· Apr 18, 2026Cryptography

Question

Which of the following was not designed to be a proprietary encryption algorithm?

Options

ARC2
BRC4
CBlowfish
DSkipjack

Explanation

Blowfish is a symmetric block cipher with variable-length key (32 to 448 bits) designed in 1993 by Bruce Schneier as an unpatented, license-free, royalty-free replacement for DES or IDEA. See attributes below: Block cipher: 64-bit block Variable key length: 32 bits to 448 bits Designed by Bruce Schneier Much faster than DES and IDEA Unpatented and royalty-free No license required Free source code available Rivest Cipher #2 (RC2) is a proprietary, variable-key-length block cipher invented by Ron Rivest for RSA Data Security, Inc. Rivest Cipher #4 (RC4) is a proprietary, variable-key-length stream cipher invented by Ron Rivest for RSA Data Security, Inc. The Skipjack algorithm is a Type II block cipher [NIST] with a block size of 64 bits and a key size of 80 bits that was developed by NSA and formerly classified at the U.S. Department of Defense "Secret" level. The NSA announced on June 23, 1998, that Skipjack had been declassified.

Topics

#Encryption Algorithms#Symmetric Ciphers#Proprietary Algorithms

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