MATASANO SECURITY AND SQUARE

You'll use the debugger to reverse-engineer the code for each level. You can provide the device with input, then step through the code watching what the device does what that input. You're looking for a specific input that unlocks the device. Maybe that input is the correct passcode. More likely, though, it's something else: an input that exploits a bug in the device's code... Using the debugger, you'll be able to single step the lock code, set breakpoints, and examine memory on your own test instance of the lock. You'll use the debugger to find an input that unlocks the test lock, and then replay it to a real lock.

Also known as: Matasano Security and Square, Inc