Saturday Security Maxim →
One of the most singular characteristics of the art of deciphering is the strong conviction possessed by every person, even moderately acquainted with it, that he is able to construct a cipher which nobody else can decipher. I have also observed that the cleverer the person, the more intimate is his conviction. In my earliest study of the subject, I shared in this belief, and maintained it for many years. - Charles Babbage (1791-1871), Passages from the Life of a Philosopher