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In the DES algorithm the round key is __________ bit and the Round Input is ____________bits.

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In the DES algorithm the round key is __________ bit and the Round Input is ____________bits.

(a) 48, 32

(b) 64,32

(c) 56, 24

(d) 32, 32

I have been asked this question in examination.

Question is from The Data Encryption Standard (DES) and It’s Strength in portion Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security

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The correct option is (a) 48, 32

The best I can explain: The round key is 48 bits. The input is 32 bits.

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