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What are the allowable values of word size in bit for RC5 algorithm?

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What are the allowable values of word size in bit for RC5 algorithm?

(a) 16, 32

(b) 16, 32, 64

(c) 8, 16, 32

(d) 16, 32, 48

The question was posed to me at a job interview.

This is a very interesting question from RC4 and RC5 in section Pseudorandom Number Generation and Stream Ciphers and More Block Ciphers of Cryptograph & Network Security

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Right option is (b) 16, 32, 64

The best explanation: Word sizes in bits for RC5 algorithm can be 16, 32 or 64.

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