CEH v9 test would like to see if you understand the concept of Exclusive OR(XOR) operation, or more likely how to calculate binary numbers using ‘XOR’ operation.

Basically these type of questions are related to cryptographical tools and asking if you how they work.

In XOR operation binary calculation works as the following table.

Value A Value B XOR returns
0 0 0
0 1 1
1 0 1
1 1 0

 

For instance, XOR the following binary values;

10110001

00111010

will return,

10001011

 

CEH v9 would not ask other operations like AND, OR, NOR but there is no harm in learning more stuff, so here we go.

AND operation

Value A Value B AND returns
0 0 0
0 1 0
1 0 0
1 1 1

 

OR operation

Value A Value B OR returns
0 0 0
0 1 1
1 0 1
1 1 1

 

NOR operation

Value A Value B NOR returns
0 0 1
0 1 0
1 0 0
1 1 0

 

NAND operation

Value A Value B NAND returns
0 0 1
0 1 1
1 0 1
1 1 0

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