Head of Cybersecurity R&D Capgemini/Sogeti France
Mathis Hammel is a Deputy CTO for Sogeti (part of Capgemini) and the founder of h25, a startup specialized in technical competitions. He is a specialist and technical advisor in cybersecurity, machine learning, and algorithms. Mathis is a passionate CTF player and competitive programmer, with several achievements in national and international challenges, and the captain of the first semi-professional CTF team in France.
New Detection Techniques Against ThisPersonDoesNotExist.com
ThisPersonDoesNotExist.com is a very useful tool when it comes to generating realistic artificial identities, especially for social media profile pictures. However, we have found a flaw in its implementation of StyleGAN2 which allows to detect with 100% accuracy whether a profile was generated by ThisPersonDoesNotExist or not.
This technique is combined with a deep learning model to make it resistant against transformations such as cropping, flipping, or strong jpg compression, and show that it maintains very high accuracy.
Our method also allows to recover the timestamp at which the image was generated; this is useful to find profile pictures generated within a few seconds of each other (which are likely to belong to the same person).
To implement this detection, we have developed FADA, a web-based open-source tool implementing the three techniques mentioned above. Since FADA requires significant computing power, it will also be hosted on our servers and free of use by anyone to help their OSINT investigations.
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