Edgar Allan Poe was fascinated by ciphers.  This one from 1840 was submitted to Graham's Magazine in response to his article  "A Few Words on Secret Writing," which offered a subscription to any reader who could send Poe cipher he could not crack. After six months, he claimed to have solved 100 entries and then published two additional ciphers, allegedly submitted by a Mr. W. B. Tyler, who may have been Poe himself. This famous cryptogram remained unsolved until 2000.