lock

104 Articles

A Simple App Controlled Door Lock

January 16, 2020 by 9 Comments

[Adnan.R.Khan] had a sliding door latch plus an Arduino, and hacked together this cool but simple app controlled door lock.

Mechanically the lock consists of a Solarbotics GM3 motor, some Meccano, and a servo arm. A string is tied between two pulleys and looped around the slide of a barrel latch. When the motor moves back and forth it’s enough to slide the lock in and out. Electronically an Arduino and a Bluetooth module provide the electronics. The system runs from a 9V battery, and we’re interested to know whether there were any tricks pulled to make the battery last.

The system’s software is a simple program built in MIT App Inventor. Still, it’s pretty cool that you can get functionally close to a production product with parts that are very much lying around. It also makes us think of maybe keeping our childhood Meccano sets a little closer to the bench!

Use A Digital Key To Deter Lockpicking

July 19, 2019 by 25 Comments

Spending an hour or two around any consumer-level padlock or house deadbolt lock with a simple lockpicking kit will typically instill a good amount of panic and concern about security. While it’s true that any lock can be defeated, it’s almost comically easy to pick basic locks like this. So, if you’re looking for a level of security that can’t be defeated in two minutes with a tiny piece of metal, you might want to try something a little more advanced.

This project stemmed from an idea to use a YubiKey, a USB hardware token typically used for two-factor authentication, for physical locks instead. The prototype was built around an Arduino UNO, and all of the code and build instructions are available on the project’s site. The creator, [rprinz08], does not have one built inside of a secure enclosure so that would remain an exercise for the reader, but the proof-of-concept is interesting and certainly useful.

While digital keys like this can have their own set of problems (as all locks do), this would be a great solution for anyone needing to lock up anything where physical keys are a liability or a nuisance, where logging is important, or where many people need access to the same lock. The open source code and well-known platform make it easy for anyone to build, too.

Turning A Single Bolt Into A Combination Lock

July 18, 2019 by 27 Comments

In our search for big-box convenience, we tend to forget that locksmiths once not only copied keys but also created complex locks and other intricate mechanisms from scratch. [my mechanics] hasn’t forgotten, and building a lock is his way of celebrating of the locksmith’s skill. Building a combination lock from a single stainless bolt is probably also showing off just a little, and we’re completely fine with that.

Granted, the bolt is a rather large one – an M20x70 – and a few other materials such as brass rod and spring wire were needed to complete the lock. But being able to look at a single bolt and slice it up into most of the stock needed for the lock is simply amazing. The head became the two endplates, while the shank was split in half lengthwise and crosswise after the threads were turned off; those pieces were later turned down into the tubes and pins needed to create the lock mechanism. The combination wheels probably could have come from another – or longer – bolt, but we like the look of the brass against the polished stainless, as well as the etched numbers and subtle knurling. The whole thing is a locksmithing tour de force, and the video below captures all of it without any fluff or nonsense.

If working in steel and brass isn’t your thing, fear not – a 3D-printed combination lock is probably within your reach. Or laser cut wood. Or even plain paper, if you’re not into the whole security thing.

Continue reading “Turning A Single Bolt Into A Combination Lock” →

WiFi Your Door Lock With An ESP

March 25, 2019 by 18 Comments

The Internet of Things is upon us, and with that comes a deluge of smart cameras, smart home monitors, and smart home locks. There actually aren’t many smarts in these smart conveniences, and you can easily build your own. That’s what [MakerMan] did with some off-the-shelf parts and just a little bit of code. Now he can open his door with WiFi, and it’s a nice clean build.

The build process began by first removing the existing barrel bolt on the door. This was replaced by a deadbolt that also had some really neat solenoids inside for remote activation. This was mounted to the door in a way that the door could lock, with a minimal amount of damage from some skillful hacksaw work. The only thing left to do after this was add some electronics and brains to the lock.

For this, [MakerMan] added a button and LED to the outside of the door. Some of these wires were fed into the lock mechanism, with a few more run over to a project enclosure mounted next to a power outlet. The project enclosure holds an ESP-8266, power regulator, and relay board, and the ESP is running code that instantiates a web server that will unlock the door with a few clicks on a web page.

Sure, it’s probably not the most secure lock on the planet, and the 5V linear regulator is held on to the relay board with hot glue, but this is an exceptionally well-documented project, and all the code is available in an archive.

Continue reading “WiFi Your Door Lock With An ESP” →

3D Printing A Combination Lock

March 21, 2019 by 2 Comments

Combination locks! They’re great if you’re skilled at remembering arbitrary strings of numbers, and have a dramatic flair that’s made them a famous part of many a heist movie. They come in a wide variety of styles, and are vulnerable to a different set of attacks than the more typical pin-tumbler locks used on a household basis. If you fancy tinkering with a combination lock, why not 3D print one yourself?

It goes without saying that any lock you 3D print is going to have issues with strength. Such a lock should not be used to protect anything of real value, but it could be handy to prevent the kids getting at the Halloween candy you’re saving for October.

Regardless, 3D printing and assembling your own combination lock is a great way to learn about how they work. It’s a fun project that is also much easier than sourcing and disassembling the real thing. For a greater understanding of the underlying mechanism, this video should make the basic operation clear.

That’s not all 3D printing can offer to the locksport community, of course. You can always print your own keys, too. Video after the break. Continue reading “3D Printing A Combination Lock” →

Hacked Electric Toothbrush Defeats Locks With Ease

September 17, 2018 by 41 Comments

The movie version of lockpicking tends to emphasize the meticulous, delicate image of the craft. The hero or villain takes out a slim wallet of fine tools, applies them with skill and precision, and quickly defeats the lock. They make it look easy, and while the image isn’t far from reality, there are other ways to pick a lock.

This expedient electric toothbrush lockpick is a surprisingly effective example of the more brute force approach to lockpicking. As [Jolly Peanut] explains, pin tumbler locks work by lining up each pin with the shear line of the cylinder, which allows the lock to turn. This can be accomplished a pin at a time with picks, or en masse by vibrating the pins until they randomly line up with the shear line just long enough for the lock to turn. A locksmith might use a purpose-built tool for the job, but a simple battery-powered electric toothbrush works in a pinch too. [Jolly Peanut] removed the usual business end of the brush to reveal a metal drive rod that vibrates at a high frequency. The rod was slimmed down by a little grinding to fit into the keyway of a lock, and with the application of a little torque, the vibration is enough to pop the pins into the right position. He tries it out on several locks in the video below, and it only takes a few seconds each time.

Such brute force methods have their drawbacks, of course. They’re not exactly subtle, and the noise they create may attract unwanted attention. In that case, hone your manual lockpicking skills with a giant 3D-printed see-through lock.

Continue reading “Hacked Electric Toothbrush Defeats Locks With Ease” →

Opening A Ford With A Robot And The De Bruijn Sequence

June 18, 2018 by 72 Comments

The Ford Securicode, or the keyless-entry keypad available on all models of Ford cars and trucks, first appeared on the 1980 Thunderbird. Even though it’s most commonly seen on the higher-end models, it is available as an option on the Fiesta S — the cheapest car Ford sells in the US — for $95. Doug DeMuro loves it. It’s also a lock, and that means it’s ready to be exploited. Surely, someone can build a robot to crack this lock. Turns out, it’s pretty easy.

The electronics and mechanical part of this build are pretty simple. An acrylic frame holds five solenoids over the keypad, and this acrylic frame attaches to the car with magnets. There’s a second large protoboard attached to this acrylic frame loaded up with an Arduino, character display, and a ULN2003 to drive the resistors. So far, everything you would expect for a ‘robot’ that will unlock a car via its keypad.

The real trick for this build is making this electronic lockpick fast and easy to use. This project was inspired by [Samy Kamkar]’s OpenSesame attack for garage door openers. In this project, [Samy] didn’t brute force a code the hard way by sending one code after another; (crappy) garage door openers only look at the last n digits sent from the remote, and there’s no penalty for sending the wrong code. In this case, it’s possible to use a De Bruijn sequence to vastly reduce the time it takes to brute force every code. Instead of testing tens of thousands of different codes sequentially, this robot only needs to test 3125, something that should only take a few minutes.

Right now the creator of this project is putting the finishing touches on this Ford-cracking robot. There was a slight bug in the code that was solved by treating the De Bruijn sequence as circular, but now it’s only a matter of time before a 1993 Ford Taurus wagon becomes even more worthless.