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The total number of subkeys t used in the RC5 algorithm is given by the formula (r corresponds to number of rounds)

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The total number of subkeys t used in the RC5 algorithm is given by the formula (r corresponds to number of rounds)

(a) t=2r+4

(b) t=2r

(c) t=2r+2

(d) t=2r-2

I had been asked this question during an internship interview.

My doubt is from RC4 and RC5 topic in division Pseudorandom Number Generation and Stream Ciphers and More Block Ciphers of Cryptograph & Network Security

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The correct choice is (c) t=2r+2

To explain I would say: The total number of keys used in the RC5 algorithm is given by the formula t=2r=2.

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