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The number of unique substitution boxes in DES after the 48 bit XOR operation are

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The number of unique substitution boxes in DES after the 48 bit XOR operation are

(a) 8

(b) 4

(c) 6

(d) 12

The question was posed to me by my college director while I was bunking the class.

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

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The correct choice is (a) 8

Explanation: The substitution consists of a set of 8 S-boxes, each of which accepts 6 bits as input and produces 4 bits as output.

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