Question: Suppose triple DES with a 1 6 8 - bit key is defined as C = E ( E ( E ( P , K

Suppose triple DES with a 168-bit key is defined as C=E(E(E(P,K1),K2),K3). Suppose there is a precomputed table of size 256, and a chosen plaintext attack is possible. Use the attack on double DES to show that this triple DES is no more secure than the usual 3DES that uses 112-bit key.

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