ARTEAM EZINE ISSUE IV
In the last passage, I combine the 2 permutations; you can see References for more infos. So, approaching the problem in this way, I simplified the Cryptographic scheme:
We can further simplify XOR’s barriers having one XOR operation for each location in colorized block; for example, in blue block, we have 2 XOR operations for 2° location: XOR(2, A248C13Bh) -> XOR(2, 1893CBE0h) = XOR(2, BADB0ADBh); simply no?
Reversing the Protection’s scheme of Alexey Pajitnov’s game Dwice by Gyver75
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