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A stream cipher key is usually of size ___ or 128 bits.

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A stream cipher key is usually of size ___ or 128 bits.

(a) 56

(b) 64

(c) 54

(d) 48

This question was addressed to me in an interview for job.

The query is from Principles of PRNG in section Pseudorandom Number Generation and Stream Ciphers and More Block Ciphers of Cryptograph & Network Security

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Right choice is (c) 54

The best explanation: A stream cipher key is usually of size 54 or 128 bits.

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