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DES cipher breaking bruteforce method

I was reading upon Biham and shamir's paper and a fact has been presented over there - if $ P1 = \overline P2$ and I choose a key $K1 = \overline K2$ then in that case $$T1 = DES(P1, K1)$$ $$T2 = ...
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1answer
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Difference between linear cryptanalysis and differential cryptanalysis

What is the main difference between linear cryptanalysis and differential cryptanalysis? For example in relation to DES?