General, which treats of

The Origin and Nature, c.1.

The Definition, c.2.

The Name, which, also is called

Cryptology

Steganology

Steganography

Polygraphy

An Introduction in Bk. I, and that is

The Art of Notes and Ciphers

Cryptomenytics

Synthemology

Semaeology

The Class, which is Art

The Parts of the Definition, likewise, c.2, which are

The End

External, namely the Disclosure of the Secret

Internal, namely the Hiding of the secret, especially through Writing where is considered

Position

Of letters

Special, which treats of

Form

Order

Power

Mode of Writing

Instrument of Writing

Material

On which

My Cryptography is completed in

Of which

End

Necessary Consignment

The Objects which are

Matters of Religion

Occult Learning

Difficult undertakings and Important matters of Business

The Subjects, to whom,  which are

Scholars

Absent Friends

Ourselves

The Class, c.3

The Distribution of the Treatise, c.4, into Modes

Of Hidden speaking

Of Quasi-Speaking through signs

Of Hidden writings

The Treatment of the Principles or Media in Bks 2, 3, 4, 5, 6 7 and 8. A.

An Exercise book in the Ninth and Last Book. M