Test only password on rar archive

passwords brute-force rar
yggdrasil picture yggdrasil · Mar 20, 2013 · Viewed 7.2k times · Source

I'm trying to do a bruteforce attack on a rar archive and I need the password-check to be as fast as possible. I call rarlab's "unrar" command line utility from my program in this way:

unrar t -p[password] archive.rar

And it works, but is extremely slow. The encrypted file inside the archive is about 300MB big, and unrar utility tells me there's a CRC error (wrong password) only after testing the whole file size. (which takes 10-15 secs)

Is there a quicker way to test just the archive password?

Answer

Lukasz Frankowski picture Lukasz Frankowski · Jun 3, 2013

Look with rar l if the archive contains more files than the "main" file you'd like to extract. There are usually .txt or .nfo files contained in the archive with few KB-s. You can then execute brute force attack to extract only the smallest file in archive with rar -ppassword x <archive> <file> what should be much faster.

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