2. A brief taxonomy of classic digital techniques

Nowadays, most information is transmitted digitally. We're going to take a particular interest in techniques that use this format. This section has three main objectives:

• illustrate the diversity of steganographic media;

• illustrate the dependence of techniques on the types of data and formats used to represent them;

• introduce elements that will help us give concrete examples of the theoretical concepts we'll be tackling in the following section, mainly around steganography in images.