Cryptomenysis Patefacta, or Art of Secret Information Disclosed Without a Key is a 1685 non-fiction book written by John Falconer, [1] it was only the second text written in English on the topic of cryptography. [2] In 1693 it was republished as Rules for Explaining and Deciphering All Manner of Secret Writing. [3]
The book serves as a guide to various cyphers, including Egyptian hieroglyphs and fingerspelling. [4]