linuxpasswordsrar
I have some password protected .rar files. I have the password. I want to remove the password from my files. I mean I want .rar files with the same name without password.
My Linux OS has unrar and rar packages installed.
Is it possible to do it with a single line script?!
Thanks
You can bypass the hash extraction altogether and use cRARk instead. cRARk is a freeware command-line RAR password cracking utility available for Windows, Mac and Linux. It is also designed to work with CUDA so you may want to take advantage of that if you have a powerful GPU.
One caveat is that it will take very long to crack an archive if you know nothing about the password, and it is > 6 characters in length. If you do know a small detail about the password, such as the approximate number of characters, it allows you to input that as a switch to dramatically shorten cracking time. Even though cRARk is one of the fastest RAR crackers out there using extremely optimized MMX & SSE code, this holds true for any brute force application. When cracking longer passwords, it will take a substantially longer amount of time due to the myriad of possibilities to try.
Here's a sample run of cracking the password 'john':
C:\>crark.exe -c -l4 -g4 Chap7.rar
cRARk 3.2d (CUDA enabled) Freeware
Copyright 1995-2001, 2006-09 by P. Semjanov,
http://www.crark.net
portions (c) 1993-2005 Eugene Roshal
(c) PSW-soft Password Cracking Library PCL v. 2.0d by P. Semjanov
Testing archive Chap7.rar : version 2.9
Testing Chap7.rtf
Choosing best crypto functions.................................................
Chosen: ASM (Prescott/AMD), SSE2 (P4/Core 2) (-f1114)
Ticks per password expected = 40438280, theoretical = 27000000, CPU rate = 0.67
Processing line 56 of password definition file...
Testing 4-chars passwords ...
ckdk
Passwords tested = 42000 (time = 3:45.00, rate = 186 p/s)
elka
Passwords tested = 78000 (time = 6:58.99, rate = 186 p/s)
john - CRC OK
In hex (PCL style): \6A \6F \68 \6E
Passwords tested = 167844 (time = 15:02.38, rate = 186 p/s)
Total tested = 167844, slow tests = 20914
Not too shabby ;)
Yes, every entry in a .rar file can be encrypted with a different password.
To prove this, simply create a .rar archive and protect it with a password.
We now have an archive with 1 file that is encrypted:
Now we just drop another file in there...
...chose a different password for this one...
If we now try to extract that second file, using the first password..
...it fails.
This might not be immediately apparent, but the password given when creating the archive, does not protect the archive itself, it protects every single file individually.
For example, setting a password for an archive does not stop you from adding new files to it.
However, this changes when choosing the Encrypt file names option (which you always should when using encryption with file archives). If you also encrypt the file names, this will encrypt the entire stream (not just the individual file streams).
If you want to modify an archive like that at all (like adding new files), you'll need the password that was used to encrypt the entire archive.
Best Answer
Some answers you could find here, which are generally sound. And the very popular answer is also here. You have to decompress and then recompress into a new RAR file. Then simply delete the old encrypted file and you've got yourself a fresh new RAR package without the unneeded password.
Create a new unprotected RAR file (e.g. containing an empty folder), then open the old protected one. Now drag the files into the new unprotected RAR. No extracting needed.
Or you can open the archive then rightclick on the file and choose "set default password" and then enter the password, this way you will never have to enter the password again anytime you want to open the file.