Découvrez les séminaires passés et à venir proposés par l’axe cybersécurité.

📅 2025

Séminaire doctorants

Date et heure : TBD
Lieu : TBD

📅 2024

Séminaire cybersécurité #1

Date et heure : 21 octobre 2024, 13h30-15h00
Lieu : Agora 2, bâtiment ESPRIT

Présentation 1: Controlling False Positives of Deep Learning Detectors, Jan Butora
Résumé:
Deep convolutional neural networks are state-of-the-art detectors for various digital image forensics techniques, such as steganalysis - detection of steganography. However, their performance is often measured only by empirically evaluating a given testing set of images of a fixed size. Moreover, the so-called cover-source mismatch makes the detectors unusable on images with different noise properties. In this talk, we will follow the real-world requirements of a forensic analyst, demanding robustness against image size, image source, and theoretical guarantees on very small False Positive (FP) rates, such as 10^-4 or lower, which are in practice hard to achieve empirically. First, I will introduce the Reverse JPEG Compatibility Attack that allows us to model cover (pristine) images in order to control the FP rate. Then we will use this technique in a deep learning classifier and demonstrate that by carefully modifying the architecture and studying its soft outputs - the logits - we can accurately predict the distribution of the logits w.r.t. image size. Such a detector, used as a one-class classifier, accurately follows theoretically prescribed FP rates and still generalizes enough to correctly detect unseen steganography.

Présentation 2: An Overview of Automated Program Analysis, Raphaël Monat
Résumé:
This talk will present a brief overview of automated program analysis such as fuzzing, symbolic execution, and conservative static analysis. These techniques can be used to detect various bugs in programs, including buffer overflows which may create security vulnerabilities. I will then describe the methodology used by the abstract interpretation community to develop conservative static analyses, and comment ongoing research efforts (and struggles!) we encounter within Mopsa, an open-source static analysis platform I am co-developing.

📅 2023

Journées sécurité à CRIStAL

Date et heure : 21 octobre 2024, 13h30-15h00
Lieu : Amphithéâtre Atrium, bâtiment ESPRIT