Well-cracked code

时间:2019-03-06 10:15:01166网络整理admin

By Barry Fox Back in 1933 William Friedman and the US government’s National Security Agency applied for a patent on a way of generating an unbreakable code that the military could use to send messages. The patent describes and sketches a typewriter keyboard with electrical connections made through wheels. The wheels move randomly to keep altering the connection paths, so that the typed output bears no systematic relationship to the input-thwarting attempts to break the code. This system was remarkably similar to Germany’s Enigma system. After 67 years,