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Which of the following is a symmetric encryption algorithm?

Which of the following is a symmetric encryption algorithm?

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A.
RSA

B.
Elliptic Curve

C.
RC5

D.
El Gamal

Explanation:
RC5 is a symmetric-key block cipher notable for its simplicity. Designed by Ronald Rivest in 1994, RC stands
for “Rivest Cipher”, or alternatively, “Ron’s Code”. The Advanced Encryption Standard (AES) candidate RC6
was based on RC5.
RC5 has a variety of parameters it can use for block size, key size, and the number of rounds used. It was
created by Ron Rivest and analyzed by RSA Data Security, Inc. The block sizes used in this algorithm are 32,
64, or 128 bits, and the key size goes up to 2,048 bits. The number of rounds used for encryption and
decryption is also variable. The number of rounds can go up to 255.
Incorrect Answers:
A: RSA is an asymmetric key algorithm.
B: Elliptic Curve Cryptosystem (ECC) is an asymmetric key algorithm.D: El Gamal is an asymmetric key algorithm.

https://en.wikipedia.org/wiki/RC5
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 810


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