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Taktloss, posted Mon Oct 12, 2015 3:11 pm (8381)

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Hello,
i would really like to learn more about encryption/decryption keys like in Telltale games. Can *maybe* someone explain a bit how to find such a key ?

Thanks in advance

maxton, posted Thu Jun 16, 2016 5:31 pm (14520)

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Often the easiest way to find encryption/decryption keys is to locate the encryption/decryption routines by decompiling the game binary. You could also try using a debugger/memory editor to look in RAM while the game is running, but even then having the disassembly is probably necessary to know where you should be looking.

atom0s, posted Fri Jun 17, 2016 7:02 am (14531)

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Some other methods you can use to find the crypt functions easily is look for string references to paths where the files are located.
Also setting breakpoints on CreateFileA/CreateFileW/ReadFile/WriteFile etc. to attempt to find when the game accesses the encrypted files can lead you back to the functions of interest.

Doing static analysis in a disassembler like IDA makes things easier as well vs. debugging as you can trace around the file much faster.