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Which among the following cannot be used in the case of stream ciphers?

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Which among the following cannot be used in the case of stream ciphers?

(a) TRNGs

(b) PRNGs

(c) PRFs

(d) All of the mentioned

I got this question in an online quiz.

I need to ask this question from Principles of PRNG topic in chapter Pseudorandom Number Generation and Stream Ciphers and More Block Ciphers of Cryptograph & Network Security

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Right answer is (a) TRNGs

For explanation: TRNGs are not practical for stream ciphers.

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