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Which of the following is a natural candidates for stream ciphers?

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in Cryptograph & Network Security by (60.0k points)
Which of the following is a natural candidates for stream ciphers?

(a) OFB

(b) CFB

(c) CBC

(d) ECB

I had been asked this question in exam.

Enquiry is from DES Modes of Operation in section Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

1 Answer

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Right choice is (a) OFB

To explain: OFB and CTR both produce outputs that are independent of both PT and CT. Thus they are ideal candidates for stream ciphers.

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