This library is built in the open.
If you spot an error, have a suggestion, or just want to say hello — we’d love to hear from you.

An introduction regarding the secrets of writing, which is established partly by the Substitution of letters and partly by their Transposition. That Cryptography properly consists of Substitution, and Anagram-making in Transposition.
THERE IS more than one secret way original: "latebra," literally a hiding place or refuge. of writing: none is more ready at hand than that which is formed by letters, whether they are foreign and Substituted, or one's own and Transposed. Substitution occurs in a whole discourse, or a part of it, when the things we mean must be hidden. Transposition occurs mostly in Proper Names, when learned men either adopt or allow this fictional persona; they are cautious when it is a fine thing to be unknown, and safe where it is necessary to lie hidden. As...