Crack Pdf Files with Ubuntu Linux!

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 switchingfirst 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

Crack your Zip Files in Ubuntu with the Ultimate Zip Cracker

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 archivesfcrackzip is a fast password cracker partly written in assembler.It is able to crack password protected zip files with bruteforce or dictionary based attacks, optionally testing withunzip its results.

It can also crack cpmask'ed images.

Homepage: http://www.goof.com/pcg/marc/fcrackzip.htmlHow 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).

fcrackzip --method cpmask --charset A --init AAAA test.ppm

15 Great Ubuntu Tips For Linux Power Users

1. Get lightning fast and clever at the command line

You can use keyboard shortcuts and other command line tricks to make entering commands easier and faster. You might already know about the ‘tab’ key which completes partial commands and even file and directory names.

Here are some other keyboard shortcuts you can use within terminal:

Ctrl-a Move to the start of the line.Ctrl-e Move to the end of the line.Alt-] x Moves the cursor forward to the next occurrence of x.Alt-Ctrl-] x Moves the cursor backwards to the previous occurrence of x.Ctrl-u Delete from the cursor to the beginning of the line.Ctrl-k Delete from the cursor to the end of the line.Ctrl-w Delete from the cursor to the start of the word.Ctrl-y Pastes text from the clipboard.Ctrl-l Clear the screen leaving the current line at the top of the screen.Ctrl-x Ctrl-u Undo the last changes. Ctrl-_Alt-r Undo all changes to the line.Alt-Ctrl-e Expand command line.Ctrl-r Incremental reverse search of history.Alt-p Non-incremental reverse search of history.!! Execute last command in history!abc Execute last command in history beginning with abc!n Execute nth command in history^abc^xyz Replace first occurrence of abc with xyz in last command and execute it

Also don’t forget to check out 4 websites where you can learn cool command line tricks

2. Launch Ubuntu Linux Applications with keyboard

There are two ways you can achieve this:

Use applications like Launchy or Gnome-Do that make it easier to launch applications by typing a few characters of the application’s name.

Or you can summon gconf editor (Alt+F2 then type gconf-editor and hit enter), and navigate to apps > metacity > global_keybindings, double click on any of the run_command_N and type in the keyboard shortcut you want to assign to an application then make a mental note of the number N. Then go to apps > metacity > keybinding_commands and double click on command_N (N being the number you used above) and type in the command you want to run. As an example if you wanted to run Firefox you would type in firefox.

Also check out these Ubuntu keyboard shortcuts you might not know about.

3. Start from wherever you left off

You can make Ubuntu remember the applications you had open when you last logged out, so that when you log back in again you’ll find all those applications running and you can resume right from where you left off.

To achieve this go to System > Preferences > Startup Applications, then go to the options tab and check "Automatically remember running applications when logging out"

4. Create a Separate Ubuntu Linux Home Partition

New versions of Ubuntu arrive every 6 months. Although you can upgrade to the latest version via the update manager, sometimes the upgrade doesn’t work as expected so some users like to do a fresh clean install.

The disadvantage with that of course is that you lose data you had in your home directory. To overcome this you can create a separate Home partition when you are installing Ubuntu, size it according to your requirements and then when you decide to install Ubuntu the next time, simply specify this partition as the Home partition (by choosing /home as the mount point).

All your files and data on the Home partition will be preserved even after a fresh install.

5. Update and Install Ubuntu Linux Software Without Internet Connection

There are lots of way to do this, the easiest of all is to use APTonCD. APTonCD allows you to create CDs and DVD’s containing all the packages you want, which you can then use to install software on computers without an internet connection.

Note that APTonCD requires you to have an internet connection (or downloaded packages) to create the installed media. However once the media is ready you don’t need an internet connection for any of the machines you want to install the software on. Insert the appropriate CD/DVD and use apt-get as you would normally.

6. Install new fonts, Microsoft fonts and improve font rendering

Ubuntu doesn’t offer many choices when it comes to the fonts. However you can easily install new fonts including those from Microsoft like Arial,

Verdana, impact and many more. You can use different sites to find the kind of font you are looking for.

7. Use PPAs, Install latest versions of software

There are a lot of steps that a software has to go through before it becomes part of Ubuntu or becomes available through the Ubuntu repositories. While all those steps lend additional stability, it generally means that you don’t get the latest versions of all the software as soon as they are released.

If you like to stay on the cutting edge, you can search for Personal Package Archives for your favorite software on Launchpad and add those to your installation’s software sources. I briefly touched on PPAs and how to use them here. If that seems like too much work, you can also download the latest deb packages and install them by double clicking (you won’t get automatic updates for the software if you install it this way).

Remember you might get into an occasional trouble or two with the latest versions, but mostly it wouldn’t be catastrophic. You can always hop over to the Ubuntu Forums to get quick help.

8. Be the root

The root account is disabled by default on Ubuntu installations, mainly to prevent you from doing something you didn’t intend to do. However if you "promise to be careful" you can enable root account as follows:

1. Type sudo passwd root and provide a root password.2. Then head on over to System > Administration > Login Window, go to the

Security tab and check "Enable local system administrator login"

You should now be able to login as root from the Login prompt. As an alternative you can use "sudo su" to provide your password and get root prompt.

9. Run Windows applications and games

Who wouldn’t like to play Counter Strike on Ubuntu (unless of course you are completely not into it) or perhaps even run Photoshop? Well it is very much possible and here is how to do it.

10. Shorten boot time with profiling

Ubuntu Linux devs have done a great job with the boot time, Jaunty is fast and Karmic is slotted to be even faster. There is however a bit more you can do by profiling your boot. Profiling lets Ubuntu make a list of all the files that are accessed during bootup, it then sorts the files according to how they are stored on your hard disk. So the next time the system is booted, the files would be read faster.

To profile boot you need to follow these steps

At the grub menu highlight the kernel you boot most often. Press e for edit. Choose the line starting with kernel and press e again. Now add the word profile

to the end of this line. Hit Enter and then press b to boot

Note that while profiling, the system will boot slower this one time, the next time however you should see an improvement. Also keep in mind that all this is machine-dependent and also depends on the arrangement of files on your hard disk, so the difference you see might not be huge, or even nil in some cases.

11. Try out different Ubuntu Linux Desktop Environments and Desktop Managers

If you are looking for something different than the default Gnome interface, you should check out alternative desktop managers that you can use. If it is a complete Desktop Environment you are looking for, KDE4 has come a long way and is now impressively usable and fun. You can do a "sudo apt-get install kubuntu-desktop" to get KDE.

12. Create a media center or a media server

It would be great if you could easily browse and manage your huge collection of music, videos and pictures. Mesmerized by Windows Media Center’s slick interface? Wait till you see what all cool options you have to turn your Ubuntu system into a media center. You can even access your media collection on your phone, PSP or a different computer if you set up a media server on your Ubuntu machine.

13. Share Firefox profile data with Windows

Many people use Windows and Linux on the same machine. If you are one of them, there would have been times you couldn’t find that bookmark you created or password you stored when you were using Firefox from within Windows. Check out how you can share Firefox profile data across operating systems without syncing it over the web (works best if you have the same version of Firefox in both OS’s). For different computers you can of course use Weave.

14. Customize Nautilus to your liking

Nautilus is the default file manager on Ubuntu. While you may be content with what it does, there is lots more you can make it do. You can use extensions to improve functionality and even add custom functionality to Nautilus

15. Compile your own Kernel

If you can’t find something to keep you busy for the weekend and you have your customization hat on, how about building a kernel to specifically meet your requirements? This is frankly more of a learning experience. Some might say that it enables you to use just the features and drivers you require, but if everything is working fine with the kernel supplied and you don’t have any interest in the Linux kernel, skip ahead this one is not for you.

If however you require some of the experimental features of the kernel, or need it to be compiled in some other special way we say you check out this guide within Ubuntu Documentation.

16. Change Usplash Screen and create a custom splash screen for GRUB

So you didn’t count the last one? Here is another one then. A Usplash screen is Ubuntu text and a logo with a progress bar that you see when you boot up Ubuntu.

If you would like to change that to something more interesting follow these steps. What better way to show your Linux fu than customizing the very first screen that appears? You can create a custom splash screen using one of your photos, GIMP and a little tweaking. Here is the how-to.

Ubuntu Tweak Software to Change Hidden Desktop Settings

Generally, I recommend using gconf-editor ~ a tool used for editing the GConf configuration database (Gnome settings). You can always edit configuration files. Many new Linux users find it difficult to use both gconf-editor and text files.

To make your life easier and to save time try out new Ubuntu Tweak software. It is designed to configure Ubuntu easily using GUI tools. It provided many useful Ubuntu desktop and system tweaking options such as:=> View Basic System Information=> GNOME Session Control=> Show/Hide and Change Splash screen=> Show/Hide desktop icons or Mounted Volumes=> Show/Hide/Rename Computer, Home, Trash icon or Network icon=> Tweak Metacity Window Manager's Style and Behavior=> Compiz Fusion settings, Screen Edge Settings, Window Effects Settings, Menu Effect Settins=> GNOME Panel Settings=> Nautilus Settings=> Advanced Power Management Settings=> System Security Settings and much more

Quick Installation

$ cd /tmp; wget http://ubuntu-tweak.googlecode.com/files/ubuntu-tweak_0.2.4-ubuntu2_all.deb$ sudo dpkg -i ubuntu-tweak_0.2.4-ubuntu2_all.deb$ ubuntu-tweak &

(Fig. 01: Ubuntu Tweak in Action)

Bruce Byfield has published an interesting article on Linux.com:

For years, discerning Windows users have relied on Tweak UI, a semi-official Microsoft program for system settings not available on the default desktop. Now, in the same tradition and with something of the same name, Ubuntu Tweak (UT) offers the same advantage to Ubuntu users. Currently at version 0.2.4, for now UT is limited to features for GNOME and focuses mainly on changing default desktop and system behavior and how GNOME interacts with your hardware, but this small feature set is more than enough for proof of concept.