Pour une nouvelle dimension contractuelle et une personnalité morale non obligatoire en droit des sociétés

in Revue Pratique des Sociétés Civiles et Commerciales (2015), (3-4), 313-383

This text was originally presented at the International Symposium "Les journées juridiques Jean Dabin" at the Catholic University of Louvain in 1992

Apprendre à négliger le mauvais côté des choses: La modification des biais cognitifs

in Van der Linden, Martial; Ceschi, Grazia; Billieux, Joël (Eds.) Interventions psychologiques en psychopathologie cognitive (2015)

The conceptualization and assessment of problematic mobile phone use

in Yan, Z. (Ed.) Encyclopedia of Mobile Phone Behavior (Volumes 2) (2015)

Inter-regionalism through civil society participation

Presentation (2015)

Políticas de combate ao insucesso e abandono escolar numa perspetiva de género na União Europeia e Portugal - da inexistência à desarticulação

in Cavaco, Carmen; Alves, Natália; Guimarães, Feliciano (Eds.) Abandono e Insucesso Escolar - Construir uma Perspetiva de Género (2015)

Parliamentary dialogue and the role of the Joint Parliamentary Committee, in The Modernisation of the European Union-Mexico 'Global Agreement' (pp. 37-54, 57-59)

Report (2015)

Assessment of modernized GPS L5 SNR for ground-based multipath reflectometry applications

in Advances in Space Research (2015), 55(4), 1104-1116

Simulation-Based Secure Functional Encryption in the Random Oracle Model

in Progress in Cryptology -- LATINCRYPT 2015 (2015)

One of the main lines of research in functional encryption (FE) has consisted in studying the security notions for FE and their achievability. This study was initiated by [Boneh et al. – TCC’11, O’Neill – ... [more ▼]

One of the main lines of research in functional encryption (FE) has consisted in studying the security notions for FE and their achievability. This study was initiated by [Boneh et al. – TCC’11, O’Neill – ePrint’10] where it was first shown that for FE the indistinguishability-based (IND) security notion is not sufficient in the sense that there are FE schemes that are provably IND-Secure but concretely insecure. For this reason, researchers investigated the achievability of Simulation-based (SIM) security, a stronger notion of security. Unfortunately, the above-mentioned works and others [e.g., Agrawal et al. – CRYPTO’13] have shown strong impossibility results for SIM-Security. One way to overcome these impossibility results was first suggested in the work of Boneh et al. where it was shown how to construct, in the Random Oracle (RO) model, SIM-Secure FE for restricted functionalities and was asked the generalization to more complex functionalities as a challenging problem in the area. Subsequently, [De Caro et al. – CRYPTO’13] proposed a candidate construction of SIM-Secure FE for all circuits in the RO model assuming the existence of an IND-Secure FE scheme for circuits with RO gates. To our knowledge there are no proposed candidate IND-Secure FE schemes for circuits with RO gates and they seem unlikely to exist. We propose the first constructions of SIM-Secure FE schemes in the RO model that overcome the current impossibility results in different settings. We can do that because we resort to the two following models: In the public-key setting we assume a bound on the number of queries but this bound only affects the running-times of our encryption and decryption procedures. We stress that our FE schemes in this model are SIM-Secure and have ciphertexts and tokens of constant-size, whereas in the standard model, the current SIM-Secure FE schemes for general functionalities [De Caro et al., Gorbunov et al. – CRYPTO’12] have ciphertexts and tokens of size growing as the number of queries. In the symmetric-key setting we assume a timestamp on both ciphertexts and tokens. In this model, we provide FE schemes with short ciphertexts and tokens that are SIM-Secure against adversaries asking an unbounded number of queries. Both results also assume the RO model, but not functionalities with RO gates and rely on extractability obfuscation [Boyle et al. – TCC’14] (and other standard primitives) secure only in the standard model. [less ▲]

Validation d'un Nouveau Modèle Statistique de Scapula Augmenté de Marqueurs Anatomiques

in TAIMA 2015: Traitement et Analyse de l'Information: Méthodes et Applications (2015)

3D detection of damage evolution in porous brittle cement or plaster based materials

in International Conference on Tomography of Materials and Structures (2015)