Jim Sanborn is auctioning off the solution to Kryptos, the puzzle he sculpted for the intelligence agency’s headquarters. Two fans of the work then discovered the key. By John Schwartz John Schwartz, ...

A massive treasure lies hidden in a Philadelphia mansion. Ken Bauman is certain of it, and he spent 22 years in law enforcement—most of it as a railroad detective with the Norfolk Southern Railway ...

Despite the best efforts of law enforcement officers and amateur internet sleuths, there are still many unidentified serial killers. But two anonymous murderers stand head and shoulders above the rest ...

Ten years ago, an archaeological curator by the name of Sara Rivers-Cofield bought a bronze Victorian-era silk dress at a shop in Maine. Upon turning the skirt inside out, she discovered a hidden ...

Scientists have created an unconditionally secure quantum-digital payment system using single photons to prevent fraud and unauthorized duplication. A successful test in Vienna marks a major step ...

I admire a well-thought-out and implemented theme, and Batwoman Season 2 Episode 13 impresses with not one, not two, but THREE father storylines that, ironically, aired on Mother's Day. The other ...

A coded message sent by a brutal serial killer who has never been caught has been cracked more than 51 years after it was sent. This story originally appeared on Ars Technica, a trusted source for ...

In the Second World War, the Germans used a manual cipher, the “double box”. Here’s a double-box cryptogram for my readers to solve. The Doppelkasten-Schlüssel (double box cipher) was one of the most ...