TheCodeBreakers
Gaetan H. L. de Viaris. Its chief merit is that it printed its output on a strip of paper.
They did manage to describe the cipher to a government secretary, and
many years later, Jerdan, visiting a high Foreign Office official, saw a
cipher being used based on his principle. He naturally thought that it
was his, but it may have been invented independently by someone else.
Nearly every inventor of a cipher system has been convinced of the
unsolvability of his brainchild. (The tendency to claim this in patents
has, however, been receding with the rise of cryptologic sophistication.)
In 1744, Leonhard Euler, the great Swiss mathematician, sent to a friend
a monoalphabetic substitution cryptogram that had a few homophones,
expressing his belief that it could not be deciphered. He was only slightly
more naive than most inventors. A representative of the humanities,
Walter W. Skeat, a distinguished English philologist and editor of
annaabi.ee 
