The best TSA-approved luggage locks keep your belongings secure but can be opened easily for routine inspections. Here are ...

Imgur user [Criand] has been hard at work on his own project made entirely out of paper, a combination lock that can hold a secret message (reddit post). The motivation for the project was as a ...

Here’s a really fascinating circuit that implements a combination lock using relays and logic gates. Even with the schematic and written explanation of how it works we’re still left somewhat ...