TheCodeBreakers
Plaintext went in and plaintext
came out, while anyone intercepting the message between the two
endpoints would pick up nothing but a meaningless sequence of marks
and spaces. Messages were enciphered, transmitted, received, and
deciphered in a single operation—exactly as fast as a message in plain
English. The advantage was not the mechanical enciphering and printing
of the message. That had been accomplished as far back as the early
1870s by two Frenchmen, fimile Vinay and Joseph Gaussin—though not
with the speed and ease of a typewriter keyboard. Rather it was the
assimilation of encipherment into the overall communication process.
Vernam created what came to be called "on-line encipherment" (because
it was done directly on the open telegraph circuit) to distinguish it from
the old, separate, off-line encipherment. He freed a fundamental process
in cryptography from the shackles of time and error. He eliminated a
annaabi.ee 
