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Calculate the number of subkeys required in RC5 for 18 rounds of computation.

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in Cryptograph & Network Security by (60.1k points)
Calculate the number of subkeys required in RC5 for 18 rounds of computation.

(a) 40

(b) 38

(c) 36

(d) 34

The question was posed to me in quiz.

The origin of the question is RC4 and RC5 topic in chapter Pseudorandom Number Generation and Stream Ciphers and More Block Ciphers of Cryptograph & Network Security

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Correct choice is (b) 38

For explanation: Using the formula t=2r+2 we get number of subkeys as 38.

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