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775 results on '"Pointcheval, David"'

1. Covercrypt: An Efficient Early-Abort KEM for Hidden Access Policies with Traceability from the DDH and LWE

Author

Brézot, Théophile, de Perthuis, Paola, 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, Tsudik, Gene, editor, Conti, Mauro, editor, Liang, Kaitai, editor, and Smaragdakis, Georgios, editor

Published
2024
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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

3. Security Analysis of the EDHOC protocol

Author

Cottier, Baptiste and Pointcheval, David

Subjects
Computer Science - Cryptography and Security
Abstract

Ephemeral Diffie-Hellman Over COSE (EDHOC) aims at being a very compact and lightweight authenticated Diffie-Hellman key exchange with ephemeral keys. It is expected to provide mutual authentication, forward secrecy, and identity protection, with a 128-bit security level.A formal analysis has already been proposed at SECRYPT '21, on a former version, leading to some improvements, in the ongoing evaluation process by IETF. Unfortunately, while formal analysis can detect some misconceptions in the protocol, it cannot evaluate the actual security level.In this paper, we study the last version. Without complete breaks, we anyway exhibit attacks in 2^64 operations, which contradict the expected 128-bit security level. We thereafter propose improvements, some of them being at no additional cost, to achieve 128-bit security for all the security properties (i.e. key privacy, mutual authentication, and identity-protection).

Published
2022

4. Differential Privacy Guarantees for Stochastic Gradient Langevin Dynamics

Author

Ryffel, Théo, Bach, Francis, and Pointcheval, David

Subjects
Statistics - Machine Learning, Computer Science - Machine Learning
Abstract

We analyse the privacy leakage of noisy stochastic gradient descent by modeling R\'enyi divergence dynamics with Langevin diffusions. Inspired by recent work on non-stochastic algorithms, we derive similar desirable properties in the stochastic setting. In particular, we prove that the privacy loss converges exponentially fast for smooth and strongly convex objectives under constant step size, which is a significant improvement over previous DP-SGD analyses. We also extend our analysis to arbitrary sequences of varying step sizes and derive new utility bounds. Last, we propose an implementation and our experiments show the practical utility of our approach compared to classical DP-SGD libraries.

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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7. GeT a CAKE: Generic Transformations from Key Encaspulation Mechanisms to Password Authenticated Key Exchanges

Author

Beguinet, Hugo, Chevalier, Céline, Pointcheval, David, Ricosset, Thomas, Rossi, Mélissa, 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, Tibouchi, Mehdi, editor, and Wang, XiaoFeng, editor

Published
2023
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10. Security Analysis of Improved EDHOC Protocol

Author

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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11. 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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12. ARIANN: Low-Interaction Privacy-Preserving Deep Learning via Function Secret Sharing

Author

Ryffel, Théo, Tholoniat, Pierre, Pointcheval, David, and Bach, Francis

Subjects
Computer Science - Machine Learning, Computer Science - Cryptography and Security, Statistics - Machine Learning
Abstract

We propose AriaNN, a low-interaction privacy-preserving framework for private neural network training and inference on sensitive data. Our semi-honest 2-party computation protocol (with a trusted dealer) leverages function secret sharing, a recent lightweight cryptographic protocol that allows us to achieve an efficient online phase. We design optimized primitives for the building blocks of neural networks such as ReLU, MaxPool and BatchNorm. For instance, we perform private comparison for ReLU operations with a single message of the size of the input during the online phase, and with preprocessing keys close to 4X smaller than previous work. Last, we propose an extension to support n-party private federated learning. We implement our framework as an extensible system on top of PyTorch that leverages CPU and GPU hardware acceleration for cryptographic and machine learning operations. We evaluate our end-to-end system for private inference between distant servers on standard neural networks such as AlexNet, VGG16 or ResNet18, and for private training on smaller networks like LeNet. We show that computation rather than communication is the main bottleneck and that using GPUs together with reduced key size is a promising solution to overcome this barrier., Comment: 26 pages

Published
2020

19. Partially Encrypted Machine Learning using Functional Encryption

Author

Ryffel, Theo, Dufour-Sans, Edouard, Gay, Romain, Bach, Francis, and Pointcheval, David

Subjects
Computer Science - Machine Learning, Computer Science - Cryptography and Security, Statistics - Machine Learning
Abstract

Machine learning on encrypted data has received a lot of attention thanks to recent breakthroughs in homomorphic encryption and secure multi-party computation. It allows outsourcing computation to untrusted servers without sacrificing privacy of sensitive data. We propose a practical framework to perform partially encrypted and privacy-preserving predictions which combines adversarial training and functional encryption. We first present a new functional encryption scheme to efficiently compute quadratic functions so that the data owner controls what can be computed but is not involved in the calculation: it provides a decryption key which allows one to learn a specific function evaluation of some encrypted data. We then show how to use it in machine learning to partially encrypt neural networks with quadratic activation functions at evaluation time, and we provide a thorough analysis of the information leaks based on indistinguishability of data items of the same label. Last, since most encryption schemes cannot deal with the last thresholding operation used for classification, we propose a training method to prevent selected sensitive features from leaking, which adversarially optimizes the network against an adversary trying to identify these features. This is interesting for several existing works using partially encrypted machine learning as it comes with little reduction on the model's accuracy and significantly improves data privacy.

Published
2019

21. Multi-Client Functional Encryption with Fine-Grained Access Control

Author

Nguyen, Ky, Phan, Duong Hieu, 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, Agrawal, Shweta, editor, and Lin, Dongdai, editor

Published
2022
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22. MyOPE: Malicious SecuritY for Oblivious Polynomial Evaluation

Author

Izabachène, Malika, Nitulescu, Anca, de Perthuis, Paola, 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, Galdi, Clemente, editor, and Jarecki, Stanislaw, editor

Published
2022
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23. Traceable Constant-Size Multi-authority Credentials

Author

Hébant, Chloé, 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, Galdi, Clemente, editor, and Jarecki, Stanislaw, editor

Published
2022
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24. Key-Policy ABE with Switchable Attributes

Author

Delerablée, Cécile, Gouriou, Lénaïck, 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, Galdi, Clemente, editor, and Jarecki, Stanislaw, editor

Published
2022
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26. Multi-Client Inner-Product Functional Encryption in the Random-Oracle Model

Author

Abdalla, Michel, Bourse, Florian, Marival, Hugo, Pointcheval, David, Soleimanian, Azam, Waldner, Hendrik, 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, Galdi, Clemente, editor, and Kolesnikov, Vladimir, editor

Published
2020
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27. Dynamic Decentralized Functional Encryption

Author

Chotard, Jérémy, Dufour-Sans, Edouard, Gay, Romain, Phan, Duong Hieu, 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, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Micciancio, Daniele, editor, and Ristenpart, Thomas, editor

Published
2020
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28. Linearly-Homomorphic Signatures and Scalable Mix-Nets

Author

Hébant, Chloé, Phan, Duong Hieu, 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, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Kiayias, Aggelos, editor, Kohlweiss, Markulf, editor, Wallden, Petros, editor, and Zikas, Vassilis, editor

Published
2020
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29. Boosting Verifiable Computation on Encrypted Data

Author

Fiore, Dario, Nitulescu, Anca, 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, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Kiayias, Aggelos, editor, Kohlweiss, Markulf, editor, Wallden, Petros, editor, and Zikas, Vassilis, editor

Published
2020
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30. Traceable Inner Product Functional Encryption

Author

Do, Xuan Thanh, Phan, Duong Hieu, 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, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, and Jarecki, Stanislaw, editor

Published
2020
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31. Divisible E-Cash from Constrained Pseudo-Random Functions

Author

Bourse, Florian, Pointcheval, David, Sanders, Olivier, 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, Galbraith, Steven D., editor, and Moriai, Shiho, editor

Published
2019
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32. Decentralized Evaluation of Quadratic Polynomials on Encrypted Data

Author

Hébant, Chloé, Phan, Duong Hieu, 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, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Lin, Zhiqiang, editor, Papamanthou, Charalampos, editor, and Polychronakis, Michalis, editor

Published
2019
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33. Unbounded Inner-Product Functional Encryption with Succinct Keys

Author

Dufour-Sans, Edouard, 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, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Deng, Robert H., editor, Gauthier-Umaña, Valérie, editor, and Ochoa, Martín, editor

Published
2019
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34. Practical Strategy-Resistant Privacy-Preserving Elections

Author

Canard, Sébastien, Pointcheval, David, Santos, Quentin, Traoré, Jacques, 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, Lopez, Javier, editor, Zhou, Jianying, editor, and Soriano, Miguel, editor

Published
2018
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35. Privacy-Preserving Plaintext-Equality of Low-Entropy Inputs

Author

Canard, Sébastien, Pointcheval, David, Santos, Quentin, Traoré, Jacques, 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, Preneel, Bart, editor, and Vercauteren, Frederik, editor

Published
2018
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36. Fuzzy Password-Authenticated Key Exchange

Author

Dupont, Pierre-Alain, Hesse, Julia, Pointcheval, David, Reyzin, Leonid, Yakoubov, Sophia, 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, Nielsen, Jesper Buus, editor, and Rijmen, Vincent, editor

Published
2018
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37. Reassessing Security of Randomizable Signatures

Author

Pointcheval, David, Sanders, Olivier, 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 Smart, Nigel P., editor

Published
2018
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38. Decentralized Multi-Client Functional Encryption for Inner Product

Author

Chotard, Jérémy, Dufour Sans, Edouard, Gay, Romain, Phan, Duong Hieu, Pointcheval, David, 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, Peyrin, Thomas, editor, and Galbraith, Steven, editor

Published
2018
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39. On the Leakage of Corrupted Garbled Circuits

Author

Dupin, Aurélien, Pointcheval, David, Bidan, Christophe, 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, Baek, Joonsang, editor, Susilo, Willy, editor, and Kim, Jongkil, editor

Published
2018
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42. Cut Down the Tree to Achieve Constant Complexity in Divisible E-cash

Author

Pointcheval, David, Sanders, Olivier, Traoré, Jacques, 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 Fehr, Serge, editor

Published
2017
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43. Removing Erasures with Explainable Hash Proof Systems

Author

Abdalla, Michel, Benhamouda, Fabrice, Pointcheval, David, 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 Fehr, Serge, editor

Published
2017
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44. Homomorphic-Policy Attribute-Based Key Encapsulation Mechanisms

Author

Chotard, Jérémy, Phan, Duong Hieu, Pointcheval, David, 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, Nguyen, Phong Q., editor, and Zhou, Jianying, editor

Published
2017
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45. Removing the Strong RSA Assumption from Arguments over the Integers

Author

Couteau, Geoffroy, Peters, Thomas, Pointcheval, David, 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, Coron, Jean-Sébastien, editor, and Nielsen, Jesper Buus, editor

Published
2017
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48. Encryption Switching Protocols

Author

Couteau, Geoffroy, Peters, Thomas, Pointcheval, David, 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, Robshaw, Matthew, editor, and Katz, Jonathan, editor

Published
2016
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49. Robust Password-Protected Secret Sharing

Author

Abdalla, Michel, Cornejo, Mario, Nitulescu, Anca, Pointcheval, David, 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, Askoxylakis, Ioannis, editor, Ioannidis, Sotiris, editor, Katsikas, Sokratis, editor, and Meadows, Catherine, editor

Published
2016
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50. The Whole is Less Than the Sum of Its Parts: Constructing More Efficient Lattice-Based AKEs

Author

del Pino, Rafael, Lyubashevsky, Vadim, Pointcheval, David, 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, Zikas, Vassilis, editor, and De Prisco, Roberto, editor

Published
2016
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