To transmit information during wartime, various industries used to encode their messages letter by letter with an elaborate system–a primitive version of today’s digital encryption. Grant breaks down some of those secret codes, and...
Great news for scavenger-hunt designers, teenage sleepover guests, and anyone else interested in being cryptic! The old-school commercial codes used for hiding information from the enemy in a telegraphs is at your fingertips on archive.org. Have fun...