My love for xkcd comics has influenced me to write this modified autoconfig “cracking” tool that cracks wifi WEP password from your neighbors, exactly the way shown in xkcd comic number 416:

(click for larger view)
Here is the tool in action:

As you can see there are some state of the art features added to this version. [...]

Quite a while ago I showed how to hide your files with steghide, a tool used to embed information into a jpeg image file. Today I will show you how to detect a file already “stegged” without prior knowledge and possible extract the information from the image file.
For this demo, we will use a tool [...]

Crank is short for “CRyptANalysis toolKit”, and its overall purpose is to provide a powerful and extensible environment for solving classical (pen-and-paper) ciphers, providing as much automation as possible. Classical ciphers include common schemes like monoalphabetic substitutions, where each letter of the alphabet is mapped to another (usually different) letter consistently through the text. The [...]

You are probably like, “oh no! another zip cracker?” Well not really fcrackzip 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 [...]