Origin?
If it was featured in a 1941 book, then it was reinvented or something in 1965.
—wwoods 18:21, 18 March 2007 (UTC)
- David Kahn's classic "The Codebreakers" mentions Cyrillic-based versions of this cipher as being used in Czarist jails, so obviously it was not invented for the first time in 1965. Maybe its use among American POWs in Vietnam first happened in 1965... AnonMoos (talk) 20:46, 31 January 2008 (UTC)