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What is the maximum key size for the RC5 algorithm?

What is the maximum key size for the RC5 algorithm?

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A.
128 bits

B.
256 bits

C.
1024 bits

D.
2040 bits

Explanation:
RC5 is a block cipher that 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: The maximum key size for the RC5 algorithm is 2048 bits, not 128 bits.
B: The maximum key size for the RC5 algorithm is 2048 bits, not 256 bits.
C: The maximum key size for the RC5 algorithm is 2048 bits, not 1024 bits.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 810


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