Systems Security Certified Practitioner – SSCP – Question0770

Which of the following is not an example of a block cipher?

A.
Skipjack
B. IDEA
C. Blowfish
D. RC4

Correct Answer: D

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. Source: SHIREY, Robert W., RFC2828: Internet Security Glossary, may 2000.