"Few persons can be made to believe that it is not quite an easy thing to
invent a method of secret writing which shall baffle investigation. Yet it
may be roundly asserted that human ingenuity cannot concoct a cipher which
human ingenuity cannot resolve..."
"It may be observed, generally, that in such investigations the analytic ability
is very forcibly called into action; and for this reason, cryptographical
solutions might with great propriety be introduced into academies as the
means of giving tone to the most important of the powers of the mind."
- Edgar Allan Poe, "A Few Words On Secret Writing": 1841.