Speak of things public to the public, but of things lofty and secret only to the loftiest and most private of your friends. Hay to the ox and sugar to the parrot.

Johannes Trithemius (1462 – 1516).


Naive techniques in Image Steganography

In this article we are going to deal with some techniques too naive to be taken seriously but still being used frequently.

LSB Matching and Matrix Embedding

As we saw before, LSB replacement is not a secure technique. Nevertheless, there is a very simple modification to the insertion technique that makes the operation simmetrical. If we do...

LSB replacement and the SPA attack

In this article we are going to deal with LSB replacement, one of the most used techniques in image steganography. Unfortunately this technique was broken many years ago. First we...

The Prisoners' Problem

You can find a lot of tools on the Internet for hidding information inside another media (Steganography) and for creating a hidden communication mechanism (covert channel). Unfortunately, most of them...