Как по Английски будет тайнопись

noun

The practice of concealing messages or information within other non-secret text or data.

Примеры использования:

In short, they conclude, there is no significant use of steganography on the internet.

noun

The art of writing or solving codes.

Примеры использования:

Mathematical cryptography, as bad as it sometimes is, is the strongest link in most security chains.