In 1913 a man sent an encrypted postcard from Jena, Germany, to his lover in the Hamburg area. Can a reader decipher this cryptogram?

A Canadian company hides treasures that can be found by solving puzzles. The first round of the hunt is over, a second one has been announced.

The seat covers of EasyJet airplanes bear symbols that look like a pigpen cipher. Do they encode a secret message?

French crypto history expert Jean-François Bouchaudy has found something very rare: three original messages encrypted with an M-209 cipher machine. One of these is still unsolved.

A new YouTube video shows two presentations given by Bernard Fabrot and Simon Pfeffers about how they solved LCS35. Another video shows the opening of the time capsule at the same event.

An encrypted telegram sent by two Russian communists in 1918 allegedly reports the death of czar Nicholas II and his family. Can a reader decipher it?

During the Thirty Years’ War, a Swedish general wrote an encrypted letter to a German Major. Can a reader decipher this message?