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The standard building block uses _______ of a key to transform 64-bit input into 64-bit output.

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The standard building block uses _______  of a key to transform 64-bit input into 64-bit output.

(a) 32 bit

(b) 48 bit

(c) 64 bit

(d) 128 bit

I had been asked this question in exam.

My enquiry is from Stream Encryption and Commercial Applications topic in portion Spread Spectrum Techniques of Digital Communications

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Correct answer is (b) 48 bit

For explanation: The standard building block uses 48 bit keys to transform 64 bit input data into 64 bit output.

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