Glossary – Definitions

Attacker

In the context of steganography, an entity seeking to detect the use of steganography.

Error-correcting code

Data encoding for reliable transmission in noisy environments. Through matrix embedding, wet paper codes and STC codes, steganography has become a field of application for corrective codes.

Kullback-Leiber divergence

Measure of the difference between two probability distributions. Sometimes called "distance", although it does not have all the required properties. Also known as relative entropy. Has many applications, notably in information theory.

Cover document

Non-steganographic data that can be used to insert a hidden message. Sometimes abbreviated to "cover".

DCT (Discrete...