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632 results
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Seminar
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Cryptography
ECDSA White-Box Implementations, Feedback on CHES 2021 WhibOx Contest
Speaker : Agathe Houzelot - Idemia
Cryptographic algorithms are primarily designed to be secure in the black-box model, where an attacker can only observe their input/output behavior. However in practice, algorithms are rarely executed in a completely isolated environment and additional information is often leaked. In the context of mobile applications or connected objects, devices often lack secure storage to protect secret keys,[…] -
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Seminar
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Cryptography
Password-Authenticated Key Exchange (PAKE) from Isogenies
Speaker : Sabrina Kunzweiler - Université Bordeaux
The passwords that we use in our everyday life are often chosen to be easily memorable which makes them vulnerable to attacks. This problem is addressed by password-authenticated key exchange (PAKE). The general idea is to enable two parties who share the same (potentially weak) password to establish a strong session key. Most PAKE protocols used today are based on Diffie-Hellman key exchange in[…] -
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Seminar
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Cryptography
Side channel analysis against AEAD lightweight cryptography
Speaker : Modou SARRY - IMT Atlantique
Les dispositifs interconnectés tels que les réseaux de capteurs, la santé, les systèmes de contrôle distribués, l’internet des objets et les systèmes cyber-physiques sont de plus en plus répandus. Cette transition vers de petits appareils engendre de nouvelles préoccupations en matière de sécurité et de vie privée, car de nombreux algorithmes cryptographiques classiques ne répondent pas toujours[…] -
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Seminar
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Cryptography
Updatable Public Key Encryption with Lattices
Speaker : Calvin Abou-Haidar - ENS Lyon
Updatable public key encryption has recently been introduced as a so- lution to achieve forward-security in the context of secure group messaging without hurting efficiency, but so far, no efficient lattice-based instantia- tion of this primitive is known. In this work, we construct the first LWE-based UPKE scheme with polynomial modulus-to-noise rate, which is CPA-secure in the standard model. At[…] -
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Seminar
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Cryptography
Generic SCARE: reverse engineering without knowing the algorithm nor the machine
Speaker : Hélène LE BOUDER - IMT Atlantique
A novel side-channel-based reverse engineering technique is introduced, capable of reconstructing a procedure solely from inputs, outputs, and traces of execution. Beyond generic restrictions, no prior knowledge of the procedure or the chip it operates on is assumed. These restrictions confine the analysis to 8-bit RISC constant-time software implementations. Specifically, the feasibility of[…] -
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Seminar
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Cryptography
Generic Attack on Duplex-Bases AEAD Modes using Random Function Statistics
Speaker : Rachelle Heim Boissier - Inria
Duplex-based authenticated encryption modes with a sufficiently large key length are proven to be secure up to the birthday bound 2^(c/2), where c is the capacity. However this bound is not known to be tight and the complexity of the best known generic attack, which is based on multicollisions, is much larger: it reaches 2^c/α where α represents a small security loss factor. There is thus an[…] -