The World's Greatest Spies Author:Charles Wighton The invention of the first cipher based on the alphabet is credited to Julius Caesar. The ancient Chinese lit hilltop-fires to transmit messages, and a similar device was used by spies in the Boer War. Since the dawn of history spying has decisively influenced the tides of war. — According to Charles Wighton it is, in fact, the world's second o... more »ldest profession...« less