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180 results on '"Blazy, Olivier"'

2. Post-Quantum Oblivious Transfer from Smooth Projective Hash Functions with Grey Zone

Author

Bettaieb, Slim, Bidoux, Loïc, Blazy, Olivier, Cottier, Baptiste, and Pointcheval, David

Subjects
Computer Science - Cryptography and Security
Abstract

Oblivious Transfer (OT) is a major primitive for secure multiparty computation. Indeed, combined with symmetric primitives along with garbled circuits, it allows any secure function evaluation between two parties. In this paper, we propose a new approach to build OT protocols. Interestingly, our new paradigm features a security analysis in the Universal Composability (UC) framework and may be instantiated from post-quantum primitives. In order to do so, we define a new primitive named Smooth Projective Hash Function with Grey Zone (SPHFwGZ) which can be seen as a relaxation of the classical Smooth Projective Hash Functions, with a subset of the words for which one cannot claim correctness nor smoothness: the grey zone. As a concrete application, we provide two instantiations of SPHFwGZ respectively based on the Diffie-Hellman and the Learning With Errors (LWE) problems. Hence, we propose a quantum-resistant OT protocol with UC-security in the random oracle model.

Published
2022

5. Secure Decision Forest Evaluation

Author

Bettaieb, Slim, Bidoux, Loic, Blazy, Olivier, Cottier, Baptiste, and Pointcheval, David

Subjects
Computer Science - Cryptography and Security
Abstract

Decision forests are classical models to efficiently make decision on complex inputs with multiple features. While the global structure of the trees or forests is public, sensitive information have to be protected during the evaluation of some client inputs with respect to some server model. Indeed, the comparison thresholds on the server side may have economical value while the client inputs might be critical personal data. In addition, soundness is also important for the receiver. In our case, we will consider the server to be interested in the outcome of the model evaluation so that the client should not be able to bias it. In this paper, we propose a new offline/online protocol between a client and a server with a constant number of rounds in the online phase, with both privacy and soundness against malicious clients. CCS Concepts: $\bullet$ Security and Privacy $\rightarrow$ Cryptography.

Published
2021
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6. Dually Computable Cryptographic Accumulators and Their Application to Attribute Based Encryption

Author

Barthoulot, Anaïs, Blazy, Olivier, Canard, Sébastien, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Deng, Jing, editor, Kolesnikov, Vladimir, editor, and Schwarzmann, Alexander A., editor

Published
2023
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7. Post-quantum and UC-Secure Oblivious Transfer from SPHF with Grey Zone

Author

Bettaieb, Slim, Bidoux, Loïc, Blazy, Olivier, Cottier, Baptiste, Pointcheval, David, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Jourdan, Guy-Vincent, editor, Mounier, Laurent, editor, Adams, Carlisle, editor, Sèdes, Florence, editor, and Garcia-Alfaro, Joaquin, editor

Published
2023
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8. (Augmented) Broadcast Encryption from Identity Based Encryption with Wildcard

Author

Barthoulot, Anaïs, Blazy, Olivier, Canard, Sébastien, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Beresford, Alastair R., editor, Patra, Arpita, editor, and Bellini, Emanuele, editor

Published
2022
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9. Identity-Based Encryption in DDH Hard Groups

Author

Blazy, Olivier, Kakvi, Saqib A., Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Batina, Lejla, editor, and Daemen, Joan, editor

Published
2022
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10. A Correction to a Code-Based Blind Signature Scheme

Author

Blazy, Olivier, Gaborit, Philippe, Mac, Dang Truong, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Wachter-Zeh, Antonia, editor, Bartz, Hannes, editor, and Liva, Gianluigi, editor

Published
2022
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11. A Rank Metric Code-Based Group Signature Scheme

Author

Blazy, Olivier, Gaborit, Philippe, Mac, Dang Truong, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Wachter-Zeh, Antonia, editor, Bartz, Hannes, editor, and Liva, Gianluigi, editor

Published
2022
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15. An Anonymous Trace-and-Revoke Broadcast Encryption Scheme

Author

Blazy, Olivier, Mukherjee, Sayantan, Nguyen, Huyen, Phan, Duong Hieu, Stehlé, Damien, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Baek, Joonsang, editor, and Ruj, Sushmita, editor

Published
2021
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16. Generic Plaintext Equality and Inequality Proofs

Author

Blazy, Olivier, Bultel, Xavier, Lafourcade, Pascal, Kempner, Octavio Perez, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Borisov, Nikita, editor, and Diaz, Claudia, editor

Published
2021
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17. How to (Legally) Keep Secrets from Mobile Operators

Author

Arfaoui, Ghada, Blazy, Olivier, Bultel, Xavier, Fouque, Pierre-Alain, Jacques, Thibaut, Nedelcu, Adina, Onete, Cristina, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Shulman, Haya, editor, and Waidner, Michael, editor

Published
2021
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18. Efficient Encryption from Random Quasi-Cyclic Codes

Author

Aguilar, Carlos, Blazy, Olivier, Deneuville, Jean-Christophe, Gaborit, Philippe, and Zémor, Gilles

Subjects
Computer Science - Cryptography and Security, Computer Science - Information Theory
Abstract

We propose a framework for constructing efficient code-based encryption schemes from codes that do not hide any structure in their public matrix. The framework is in the spirit of the schemes first proposed by Alekhnovich in 2003 and based on the difficulty of decoding random linear codes from random errors of low weight. We depart somewhat from Aleknovich's approach and propose an encryption scheme based on the difficulty of decoding random quasi-cyclic codes. We propose two new cryptosystems instantiated within our framework: the Hamming Quasi-Cyclic cryptosystem (HQC), based on the Hamming metric, and the Rank Quasi-Cyclic cryptosystem (RQC), based on the rank metric. We give a security proof, which reduces the IND-CPA security of our systems to a decisional version of the well known problem of decoding random families of quasi-cyclic codes for the Hamming and rank metrics (the respective QCSD and RQCSD problems). We also provide an analysis of the decryption failure probability of our scheme in the Hamming metric case: for the rank metric there is no decryption failure. Our schemes benefit from a very fast decryption algorithm together with small key sizes of only a few thousand bits. The cryptosystems are very efficient for low encryption rates and are very well suited to key exchange and authentication. Asymptotically, for \lambda the security parameter, the public key sizes are respectively in $O(\lambda^{2})$ for HQC and in $O(\lambda^{4/3})$ for RQC. Practical parameter compares well to systems based on ring-LPN or the recent MDPC system.

Published
2016

24. CCA-Secure ABE Using Tag and Pair Encoding

Author

Blazy, Olivier, Mukherjee, Sayantan, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Bhargavan, Karthikeyan, editor, Oswald, Elisabeth, editor, and Prabhakaran, Manoj, editor

Published
2020
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25. Skipping the q in Group Signatures

Author

Blazy, Olivier, Kakvi, Saqib A., Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Bhargavan, Karthikeyan, editor, Oswald, Elisabeth, editor, and Prabhakaran, Manoj, editor

Published
2020
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26. Public-Key Generation with Verifiable Randomness

Author

Blazy, Olivier, Towa, Patrick, Vergnaud, Damien, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Moriai, Shiho, editor, and Wang, Huaxiong, editor

Published
2020
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28. Durandal: A Rank Metric Based Signature Scheme

Author

Aragon, Nicolas, Blazy, Olivier, Gaborit, Philippe, Hauteville, Adrien, Zémor, Gilles, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Ishai, Yuval, editor, and Rijmen, Vincent, editor

Published
2019
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29. Downgradable Identity-Based Encryption and Applications

Author

Blazy, Olivier, Germouty, Paul, Phan, Duong Hieu, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, and Matsui, Mitsuru, editor

Published
2019
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33. Hash Proof Systems over Lattices Revisited

Author

Benhamouda, Fabrice, Blazy, Olivier, Ducas, Léo, Quach, Willy, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Abdalla, Michel, editor, and Dahab, Ricardo, editor

Published
2018
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35. Almost Optimal Oblivious Transfer from QA-NIZK

Author

Blazy, Olivier, Chevalier, Céline, Germouty, Paul, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Gollmann, Dieter, editor, Miyaji, Atsuko, editor, and Kikuchi, Hiroaki, editor

Published
2017
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36. Anonymizable Ring Signature Without Pairing

Author

Blazy, Olivier, Bultel, Xavier, Lafourcade, Pascal, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Cuppens, Frédéric, editor, Wang, Lingyu, editor, Cuppens-Boulahia, Nora, editor, Tawbi, Nadia, editor, and Garcia-Alfaro, Joaquin, editor

Published
2017
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40. Adaptive Oblivious Transfer and Generalization

Author

Blazy, Olivier, Chevalier, Céline, Germouty, Paul, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Cheon, Jung Hee, editor, and Takagi, Tsuyoshi, editor

Published
2016
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41. Structure-Preserving Smooth Projective Hashing

Author

Blazy, Olivier, Chevalier, Céline, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Cheon, Jung Hee, editor, and Takagi, Tsuyoshi, editor

Published
2016
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42. Non-Interactive Plaintext (In-)Equality Proofs and Group Signatures with Verifiable Controllable Linkability

Author

Blazy, Olivier, Derler, David, Slamanig, Daniel, Spreitzer, Raphael, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, and Sako, Kazue, editor

Published
2016
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43. Mitigating Server Breaches in Password-Based Authentication: Secure and Efficient Solutions

Author

Blazy, Olivier, Chevalier, Céline, Vergnaud, Damien, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, and Sako, Kazue, editor

Published
2016
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44. A Practical Group Signature Scheme Based on Rank Metric

Author

Alamélou, Quentin, Blazy, Olivier, Cauchie, Stéphane, Gaborit, Philippe, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Duquesne, Sylvain, editor, and Petkova-Nikova, Svetla, editor

Published
2016
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46. How fast do you heal? A taxonomy for post-compromise security in secure-channel establishment

Author

Blazy, Olivier, Boureanu, Ioana, Lafourcade, Pascal, Onete, Cristina, Robert, Léo, Blazy, Olivier, École polytechnique (X), Geometry, arithmetic, algorithms, codes and encryption (GRACE), Laboratoire d'informatique de l'École polytechnique [Palaiseau] (LIX), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)-Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), University of Surrey (UNIS), Université Clermont Auvergne (UCA), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Robert, Léo, École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes (LIMOS), Ecole Nationale Supérieure des Mines de St Etienne (ENSM ST-ETIENNE)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne), and Université Clermont Auvergne (UCA)-Université Clermont Auvergne (UCA)

Subjects
[INFO.INFO-CR]Computer Science [cs]/Cryptography and Security [cs.CR], [INFO.INFO-CR] Computer Science [cs]/Cryptography and Security [cs.CR]
Abstract

International audience; Post-Compromise Security (PCS) is a property of secure channel establishment schemes, which limits the security breach of an adversary that has compromised one of the end point to a certain number of messages, after which the channel heals. An attractive property, especially in view of Snowden's revelation of mass-surveillance, PCS was pioneered by the Signal messaging protocol, and is present in OTR. In this paper, we introduce a framework for quantifying and comparing PCS security, with respect to a broad taxonomy of adversaries. The generality and flexibility of our approach allows us to model the healing speed of a broad class of protocols, including Signal, but also an identity-based messaging protocol named SAID, and even a composition of 5G handover protocols.

Published
2023

47. Tightly-Secure Signatures from Chameleon Hash Functions

Author

Blazy, Olivier, Kakvi, Saqib A., Kiltz, Eike, Pan, Jiaxin, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, and Katz, Jonathan, editor

Published
2015
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48. Generic Construction of UC-Secure Oblivious Transfer

Author

Blazy, Olivier, Chevalier, Céline, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Malkin, Tal, editor, Kolesnikov, Vladimir, editor, Lewko, Allison Bishop, editor, and Polychronakis, Michalis, editor

Published
2015
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49. Non-Interactive Zero-Knowledge Proofs of Non-Membership

Author

Blazy, Olivier, Chevalier, Céline, Vergnaud, Damien, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, and Nyberg, Kaisa, editor

Published
2015
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