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Have a look at the solutions to the challenges itself. For instance, here:
https://github.com/SideChannelMarvels/Deadpool/tree/master/wbs_aes_ches2016/DFA
They are able to obtain the last round key. This means that they are able to calculate the initial AES key. By this key it is possible to decrypt encrypted data.
Another nice read is http://phrack.org/issues/68/8.html
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