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There is a dependency on the previous ‘s’ bits in every stage in CFB mode. Here ‘s’ can range from ___

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There is a dependency on the previous ‘s’ bits in every  stage in CFB mode. Here ‘s’ can range from ___

(a) 8-16 bits

(b) 8-32 bits

(c) 4-16 bits

(d) 8-48 bits

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

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The correct answer is (b) 8-32 bits

Explanation: The range of the output of each stage of the cipher system is 8-32 bits for a 64 bit system.

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