Design a more practical attack for finding the paor of keys

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Reference no: EM132139829

Question :

Suppose Dr. Smart has designed a 4DES cipher which encrypts data m in the following way: c= Dk4(Dk3(Ek2(Ek1(m)))), where E and D denote the encryption and decryption operation of DES.

To break this cipher and learn the key pair <k1,k2,k3,k4> from <m,c> pair, a brute-force method is to try all possible combinations of <k1,k2,k3,k4>, but this requires about 2²²⁴ trials which is too much.

Design a more practical attack for finding the paor of keys used with significantly less effort. You can assume that the attacker is able to obtain a few <m,c> pairs.

Reference no: EM132139829

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