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725 results
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Seminar
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Cryptography
Can RSA keys be instance-malleable?
Speaker : Pascal Paillier - Gemplus
We focus on two new number-theoretic problems of major importance for RSA and factoring-based cryptosystems. An RSA key generator Gen(1^k) = (n, e) is malleable when factoring n is easier when given access to a factoring oracle for other keys (n', e')!= (n, e) output by Gen. Gen is instance-malleable when it is easier to extract e-th roots mod n given an e'-th root extractor mod n' for (n', e') !=[…] -
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Seminar
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Cryptography
Arithmétique d'une large classe de fonctions L
Speaker : Sami Omar - Université de Tunis
Dans cet exposé, on s'intéresse à une classe générale de fonctions L ayant des propriétés similaires à celles des fonctions zêta classiques. Dans ce cadre, nous donnons une formulation du critère de positivité de Weil pour l'hypothèse de Riemann en terme de positivité des coefficients de Li généralisés faciles à calculer. -
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Seminar
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Cryptography
Biometric-based Authentication Schemes using Private Information Retrieval
Speaker : Julien Bringer - Sagem
This work deals with the security problems in authentication schemes employing volatile biometric features, where the authentication is indeed a comparison between a fresh feature and that enrolled during the initialization phase. We propose a security model for biometric-based authentication schemes by assuming that the biometric features to be public. Extra attentions have been paid to the[…] -
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Seminar
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Cryptography
Extraction d'entropie et courbes elliptiques
Speaker : Nicolas Gurel - LIX
Lors d'un protocole de mise en accord de clé (comme Diffie-Hellman) basé sur un groupe générique G, les protagonistes aboutissent à un élément commun K_{AB} de G qui est indistinguable d'un autre élément de G mais pas d'une suite de bits aléatoire de même taille. Nous présenterons deux nouvelles méthodes pour extraire des bits de K_{AB} lorsque G est une courbe elliptique définie sur une extension[…] -
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Seminar
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Cryptography
Protecting security protocols against guessing attacks: towards
Speaker : Mathieu Baudet - ENS Cachan
Designing secure protocols based on passwords is a difficult task. Indeed, passwords, and more generally low-entropy secrets, are potentially vulnerable to guessing attacks, that is, exhaustive, "brute force" searches. Preventing guessing attacks typically requires a protocol to conceal any partial information on the password (e.g. its checksum) which could help the attacker confirm his guess[…] -