the mind > mental capacity > knowledge > secrecy, concealment > code, cipher > [noun] > art of using (4)
The art of secret writing; cryptography. Also, cryptographic script, cipher.
The art or practice of writing in code or cipher; the science of encryption; the branch of cryptology concerned with this (cf. cryptanalysis, n.)…
With the. That which relates to cryptology; the use of code or cipher. rare.
The science, study, or practice of encrypting and decrypting information.