Back | Meet in the End [TC02] - 3 point(s)

For this exercise you will break 4 rounds of TC02 a cipher designed to have (really) poor diffusion. It is an AES like cipher with a 64-bit state and 64-bit key (see the specifications for more information). The goal is to find the full encryption key using a variant of the Meet in the Middle (MitM) attack, which we will call Meet in the End (MitE) for now.

In the Meet in the End attack we take advantage of the very poor diffusion of the key bits in this cipher. We match a nibble of the state after four rounds with the ciphertext (so it essentially is a MitM attack with a backward phase of 0 rounds).

The data you get for this exercise is 16 plaintext-ciphertext pairs.

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