In 1906, an unknown person sent two beautiful postcards encrypted in a pigpen cipher to a man in Kent. Can a reader solve these two postcard cryptograms?
The pigpen cipher (also known as Freemason’s cipher) is the most popular secret writing alphabet. As reported recently, it has been used to encrypt gravestone inscriptions, treasure maps, certificates, mug inscriptions, beer labels and more. Today, I’m going to introduce ten more uses.