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kimci86 / bkcrack

Crack legacy zip encryption with Biham and Kocher's known plaintext attack.
zlib License
1.68k stars 163 forks source link

Use internal keys instead of password to create archive #98

Closed KaDw closed 1 year ago

KaDw commented 1 year ago

Thanks to bkcrypt I have the files unzipped. I know that password is 16 bytes long and unfortunately it will take a lot of time for me to crack it (even with 6 bytes optimization). I would like to zip the file again and keep the same password. Is this even possible if we only know internal keys?

The usecase is that I have a config file for an old game that is stored in password protected archive. I have to unzip this archive, modify one of the files and zip it again with the same password. I could get the password by reverse engineering the game itself but I'm looking for a more generic solution

kimci86 commented 1 year ago

Hello, your usecase looks similar the one described in another issue. See my answers there https://github.com/kimci86/bkcrack/issues/65#issuecomment-1142536511 Let me know if it helps.