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The key does not effect the cipher' differentials threw the equation (x+k)+(x'+k)=x+x' (the + sign means xor) How you can yes the key is X1+k=x2 And threw the xor k=X1 +x2 X1 is the value beffor the xor with the key value k. X2 is the output of X1+k To make this attack work beffor you must find a differential for the two input pairs threw a chosen ...

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