691 résultats
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Ransomware Detection Using Markov Chain Models Over File Headers
Orateur : David Lubicz (DGA-MI)
In this paper, a new approach for the detection of ransomware based on the runtime analysis of their behaviour is presented. The main idea is to get samples by using a mini-filter to intercept write requests, then decide if a sample corresponds to a benign or a malicious write request. To do so, in a learning phase, statistical models of structured file headers are built using Markov chains. Then[…] -
Quantum cryptanalysis of block ciphers: beyond quadratic speedups
Orateur : André Schrottenloher - CWI
The security of modern cryptosystems relies on computational assumptions, which may be challenged by the advent of large-scale quantum computing devices.<br/> While Shor's algorithm is known to break today's most popular public-key schemes, secret-key cryptosystems are generally expected to retain half of their pre-quantum bits of security. However, the precise advantage of quantum attacks cannot[…] -
Formal security proofs in a post-quantum world
Orateur : Charlie Jacomme (CISPA)
In the recent years, formals methods for security and their associated tools have been used successfully both to find novel and complex attacks on many protocols [A] and to help in their standardization process. They however face a new challenge with the increasing probability of quantum computers coming into the real-world: we need to be able to provide guarantees against quantum attackers.In[…] -
A Concrete Treatment of Efficient Continuous Group Key Agreement via Multi-Recipient PKEs
Orateur : Thomas Prest - PQShield
Continuous group key agreements (CGKAs) are a class of protocols that can provide strong security guarantees to secure group messaging protocols such as Signal and MLS. Protection against device compromise is provided by commit messages: at a regular rate, each group member may refresh their key material by uploading a commit message, which is then downloaded and processed by all the other members[…] -
Workshop mise en oeuvre de la cryptographie post-quantique
Orateur : European CyberWeek - Rennes
L'inscription est gratuite mais obligatoire, en particulier pour des raisons de jauges. Le nombre de places est limité. Le programme est disponible à l'adresse <a href="https://www.european-cyber-week.eu/cryptographie-post-quantique">https://www.european-cyber-week.eu/cryptographie-post-quantique</a><br/> -
Soutenance de thèse: Theoretical Hardness of Algebraically Structured Learning With Errors
Orateur : Katharina Boudgoust - Rennes
The main focus of this PhD thesis lies on the computational problem Learning With Errors (LWE). It is a core building block of lattice-based cryptography, which itself is among the most promising candidates to replace current cryptographic protocols once large-scale quantum computers may be available. The contributions of the present work are separated into two different parts. First, we study the[…]