QR codes–square, dot-matrix variants of the venerable UPC–are becoming an increasingly popular way to share information such as URLs, contact details, GPS coordinates, and calendar events. The idea is ...

Usually, a story about hacking a coded message will have some computer element or, at least, a machine like an Enigma. But ...

Unless your job involves working with building codes, they’re probably not something you encounter or think about on a regular basis. Though we may refer to a questionable electrical setup in an ...