(ISC)2
SSCP · Question #651
Which of the following is not an example of a block cipher?
The correct answer is D. RC4. RC4 is a proprietary, variable-key-length stream cipher invented by Ron Rivest for RSA Data Security, Inc. Skipjack, IDEA and Blowfish are examples of block ciphers.
Submitted by skyler.x· Apr 18, 2026Cryptography
Question
Which of the following is not an example of a block cipher?
Options
- ASkipjack
- BIDEA
- CBlowfish
- DRC4
How the community answered
(50 responses)- A2% (1)
- C4% (2)
- D94% (47)
Explanation
RC4 is a proprietary, variable-key-length stream cipher invented by Ron Rivest for RSA Data Security, Inc. Skipjack, IDEA and Blowfish are examples of block ciphers.
Topics
#Block cipher#Stream cipher#Symmetric encryption#RC4
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