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684 results
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Seminar
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Cryptography
Evaluation embarquée de l'entropie d'un générateur d'aléa pour la cryptographie
Speaker : David Lubicz - DGA et IRMAR
Dans cet exposé, nous présentons une méthode de mesure embarquée de la composante thermique du jitter de phase d'un couple d'anneaux d'oscillateurs : cette mesure est nécessaire pour calculer le taux d'entropie d'un générateur d'aléa physique basé sur des anneaux oscillants. La précision de cette mesure dont le principe repose sur un algorithme de type Monte-Carlo dépend de l' équidistribution de[…] -
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Seminar
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Cryptography
Recent advances in post-quantum signatures based on the MPC-in-the-Head paradigm
Speaker : Thibauld Feneuil - CryptoExperts
Zero-knowledge proofs of knowledge are useful tools for designing signature schemes. Among the existing techniques, the MPC-in-Head (MPCitH) paradigm provides a generic framework to build quantum-resilient proofs using techniques from secure multiparty computation. This paradigm has recently been improved in a series of works which makes it an effective and versatile tool. In this talk, I will[…] -
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Seminar
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Cryptography
On some efficiency aspects of the CKKS fully homomorphic encryption scheme
Speaker : Damien Stehlé - Cryptolab
Fully homomorphic encryption (FHE) is a form of encryption that allows arbitrary computations on data without requiring to decrypt the ciphertexts. Among the diverse FHE schemes, CKKS is designed to efficiently perform computations on real numbers in an encrypted state. Interestingly, Drucker et al [J. Cryptol.] recently proposed an efficient strategy to use CKKS in a black-box manner to perform[…] -
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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
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[…] -