Ubuntu Unleashed

I absolutely hate microsoft products thats why I love breaking it. This hack, is way too easy. Whatever your reason for changing any users password, this simple howto will surely satisfy that need. The only way to prevent this currently is with full disk encryption. Here is how you change windows password within Ubuntu Hardy Heron.
You can either use your livecd or hdd
sudo apt-get install chntpw
Now its installed, so lets get to work...
Ok I am assuming your using a hardy heron livecd or a Ubuntu Hardy Heron full install
You will now need to mount the windows partition read/write permission then navigate to %systemroot%/system32/config
Once your located in the config directory issue this command to change the password
chntpw -u administrator SAM
- Prompt for password for 'administrator', if found (otherwise do nothing) use * to blank

Now reboot and login to winblows

Optionally you can skip resetting the password and just install Ubuntu

Why, the hell, another zip cracker? fcrackzip isnt just any other file cracker, it is quiet old (born in 1998) and I believe the last version was from 2004. However it is simple mentioned for being the first open-sourced zip-cracker out there.

fcrackzip searches each zipfile given for encrypted files and tries to guess the password. All files must be encrypted with the same password, the more files you provide, the better.

FCrackZip is The Ultimate password cracker for zip archives
fcrackzip is a fast password cracker partly written in assembler.
It is able to crack password protected zip files with brute
force or dictionary based attacks, optionally testing with
unzip its results.

It can also crack cpmask'ed images.

Homepage: http://www.goof.com/pcg/marc/fcrackzip.html
How to Install:

sudo apt-get install fcrackzip
Install with 1-click if you have apt-url installed and your using firefox!
Examples:
fcrackzip -c a -p aaaaaa sample.zip

checks the encrypted files in sample.zip for all lowercase 6 character passwords (aaaaaa ... abaaba ... ghfgrg ... zzzzzz).

checks the obscured image test.ppm for all four character passwords. -TP fcrackzip -D -p passwords.txt sample.zip check for every password listed in the file passwords.txt.

Dont you hate when you run into a locked down pdf on the web? I search google all the time for title filetype:pdf and some are locked, this is the solution! PDFCrack is a GNU/Linux (other POSIX-compatible systems should work too) tool for recovering passwords and content from PDF-files. It is small, command line driven without external dependencies. The application is Open Source (GPL).
Features

* Supports the standard security handler (revision 2 and 3) on all known PDF-versions
* Supports cracking both owner and userpasswords
* Both wordlists and bruteforcing the password is supported
* Simple permutations (currently only trying first character as Upper Case)
* Save/Load a running job
* Simple benchmarking
* Optimised search for owner-password when user-password is known


Install pdfcrack in Ubuntu

sudo aptitude install pdfcrack

pdfcrack Syntax

pdfcrack -f filename [options]

pdfcrack Options

-b, - -bench - Perform benchmark and exit.
-c, - -charset=STRING - Use the characters in STRING as charset.
-m, - -maxpw=INTEGER - Stop when reaching INTEGER as password length.
-n, - -minpw=INTEGER - Skip trying passwords shorter than INTEGER.
-l, - -loadState=FILE - Continue from the state saved in FILENAME.
-o, - -owner - Work with the ownerpassword.
-p, –password=STRING - Uses STRING as userpassword to speed up breaking ownerpassword (implies -o).
-q, - -quiet - Run quietly.
-s, - -permutate - Try permutating the passwords (currently only supports switching
first character to uppercase).
-u, - -user - Work with the userpassword (default).
-v, - -version - Print version and exit.
-w, - -wordlist=FILE - Use FILE as source of passwords to try.

pdfcrack Example

pdfcrack mylocked.pdf

More information on this great utility can be found @ the authors site here
Lifehacker.com Has some alternative utilities and ideas for cracking pdf's here
UbuntuGeek has some information about this tool here