Brian Jones
Every once in a while a mention of an @appendixjournal story still pops up in my feeds. adactio.com/links/11798
The Invention of Wireless Cryptography—The Appendix
A marvellous story of early twentieth century espionage over the airwaves.
In one proposal, hidden instructions were interspersed within regular, ordinary-looking messages by slightly lengthening the spaces between dots and dashes.