Plausible

This book proposes a semi-discrete version of the theory of Petitot and Citti-Sarti, leading to a left-invariant structure over the group SE(2,N), restricted to a finite number of rotations. This apparently very simple group is in fact quite atypical: it is maximally almost periodic, which leads to much simpler harmonic analysis compared to SE(2). Based upon this semi-discrete model, the authors improve on previous image-reconstruction algorithms and develop a pattern-recognition theory that also leads to very efficient algorithms in practice.

Espionage: simple, state of the art encryption and plausible deniability for your data. Sometimes, encrypting your data isn't enough to protect it. That's why Espionage 3 goes beyond data encryption. What happens if you're forced to give up your password? In such situations, encryption won't help at all. To address this, we went beyond encryption and introduced multiple layers of plausible deniability into Espionage.