New FSB Decrypter

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Quidrex
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New FSB Decrypter

Postby Quidrex » Sat Apr 08, 2017 11:46 am

Without further ado I'd like to present the result of me sitting in front of the computer over the last few days: https://pastebin.com/BFEz1pYd
Yes, it decrypts _preview.fsb.xen files. Yes, it decrypts .fsb.xen files from WoR.

Technical stuff:
While xendecrypt does a known plaintext attack with the 0xFF-padding on the weak FSB encryption algorithm (XOR with 31 byte key), this tool actually computes the key as the original GH executables do, so it can also decrypt the preview files, which typically don't have enough padding. The key depends on the filename, so make sure it's all lowercase. WoR does not use the FSB encryption at all but instead uses one of 256 keys with 128-bit AES in CTR mode. The main key to use is determined by a footer which is always encrypted with the first key. The decrypted footer is output as .fsb.footer if someone wants to look for useful data.

Edit:
You can find the compiled jar at http://www.mediafire.com/file/2gmmq11ck ... ecrypt.jar
Use with: java -jar FsbDecrypt.jar <filenname.fsb.xen>
Last edited by Quidrex on Sat Apr 08, 2017 3:08 pm, edited 1 time in total.
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bluzer
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Re: New FSB Decrypter

Postby bluzer » Fri May 05, 2017 12:53 pm

Sweeet! Thanks man, guess its time to update the GHWoR files i use.

:cool:
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Quidrex
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Re: New FSB Decrypter

Postby Quidrex » Tue May 30, 2017 5:49 am

You're welcome. It was overdue for these files to become decryptable :D

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