I happened to lose the five-digit code for a SentrySafe (model KSW0510) that we had bought. Looking up the company’s website let me know that I could get the factory default combination from them again with a notarized form proving that I am who I say I am as well as $30. I knew of a couple of other things on which I could spend that $30, and I knew that the safe’s electronics were likely rather simple, so I opted to take the funner way out and use my programming and electronics prowess to crack the combination myself. This post outlines in good detail how I cracked the combination using a brute-force combination cracker I programmed in Python that interfaced with the safe using a Raspberry Pi. If you’re not very tech-savvy and just want to see the safe cracker in action, click here to skip ahead to the video of the finished product.

[Read further…]