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First property says- If you consider a 6-bit Inpput Difference(Difference means XOR in case of DES).i.e 6-bit binary number which is the xor of two inputs(obviously both 6 bits).When you enter both of these inputs to Sbox and get two outputs each of 4 bits and xor the outputs what you get is called Output Difference. Total 64 inputs are possible hence 32 ...

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