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X-WR-CALNAME:Laboratoire de Mathématiques de Versailles
X-ORIGINAL-URL:https://lmv.math.cnrs.fr
X-WR-CALDESC:Évènements pour Laboratoire de Mathématiques de Versailles
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TZID:Europe/Paris
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261008T110000
DTEND;TZID=Europe/Paris:20261008T120000
DTSTAMP:20261005T131001Z
CREATED:20260924T083525Z
LAST-MODIFIED:20261005T131001Z
UID:15315-1791457200-1791460800@lmv.math.cnrs.fr
SUMMARY:CRYPTO - Damien Vidal - Résolution de systèmes de polynômes et applications à la cryptographie
DESCRIPTION:Résolution de systèmes de polynômes et applications à la cryptographie\nAvec l’essor de la cryptographie post-quantique\, de nouvelles familles de schémas cryptographiques ont vu le jour.\nParmi elles figurent les schémas de cryptographie multivariée dont la sécurité repose sur la difficulté de résoudre un système quadratique défini sur un corps fini (problème MQ).\nPlusieurs algorithmes ont été proposés pour résoudre ce problème.\nL’algorithme Crossbred semble le plus efficace en pratique pour des corps finis de petite taille.\nLors de mon exposé\, je présenterais dans un premier temps la cryptographie fondée sur des systèmes de polynômes multivariés puis je décrirais l’algorithme Crossbred et les travaux que j’ai réalisés sur celui-ci.Solving polynomial systems and applications to cryptographyWith the rise of post-quantum cryptography\, new families of cryptographic schemes have emerged.\nAmong these are multivariate cryptographic schemes\, whose security relies on the difficulty of solving a quadratic system defined over a finite field (MQ problem).\nSeveral algorithms have been proposed to solve this problem.\nThe Crossbred algorithm appears to be the most efficient in practice for small finite fields.\nFor my presentation\, I will first introduce cryptography based on multivariate polynomial systems before describing the Crossbred algorithm and my research on this algorithm. \n\n\nLe séminaire sera aussi retranscrit en visio avec le lien suivant:\n\n\n\n\n\n\nSujet: Séminaire de Versailles\nHeure: 8 oct. 2026 11:00 AM Paris\n\nParticiper à la réunion Zoom\nhttps://uvsq-fr.zoom.us/j/91252736198?pwd=dzVspJsh5FjbtKaT3F9swckTz4tKxp.1\n\nID de réunion: 912 5273 6198\nCode secret: 973698
URL:https://lmv.math.cnrs.fr/evenenement/crypto-d-vidal/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire CRYPTO
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261015T110000
DTEND;TZID=Europe/Paris:20261015T120000
DTSTAMP:20260924T084839Z
CREATED:20260924T083720Z
LAST-MODIFIED:20260924T084839Z
UID:15317-1792062000-1792065600@lmv.math.cnrs.fr
SUMMARY:CRYPTO : Maria Naya Plasencia
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/crypto-maria-naya-plasencia/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire CRYPTO
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261015T140000
DTEND;TZID=Europe/Paris:20261015T150000
DTSTAMP:20260927T185329Z
CREATED:20260903T075954Z
LAST-MODIFIED:20260927T185329Z
UID:15034-1792072800-1792076400@lmv.math.cnrs.fr
SUMMARY:EDP : Antoine Levitt (IMO\, Paris Saclay) : Singular Brillouin zone integrals and spectral properties of periodic crystals
DESCRIPTION:The numerical computation of spectral properties (Green functions\, densities of states…) of periodic crystals relies on singular integrals in Fourier space. I will describe new algorithms to compute these integrals\, with applications to solid state physics and connections to spectral and scattering theory.
URL:https://lmv.math.cnrs.fr/evenenement/edp-antoine-levitt-imo-paris-saclay/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261015T153000
DTEND;TZID=Europe/Paris:20261015T163000
DTSTAMP:20260922T081346Z
CREATED:20260903T080141Z
LAST-MODIFIED:20260922T081346Z
UID:15219-1792078200-1792081800@lmv.math.cnrs.fr
SUMMARY:EDP : Cristobal Loyola (UTINAM\, Université Marie et Louis Pasteur) : Unique continuation for semilinear waves and Schrödinger equations under the geometric control condition
DESCRIPTION:In this talk\, I will present some results on unique continuation for semilinear wave and Schrödinger equations with analytic nonlinearities. After recalling some motivation and classical results on the topic\, I will describe a new method\, introduced in a joint work with Camille Laurent (CNRS\, LMR)\, that relies on analyticity-in-time regularization in finite time for solutions vanishing on a subset satisfying the Geometric Control Condition (GCC). The proof combines tools from control theory with ideas of Hale and Raugel on the regularity of attractors in dynamical systems. In a more recent work\, we refined this approach and applied it to Schrödinger equations on compact manifolds\, showing that the GCC suffices for unique continuation\, thus answering in the affirmative an open problem posed by Dehman\, Gérard\, and Lebeau (2006) for the nonlinear case. The method is abstract and can also be applied to study similar questions for other PDEs.
URL:https://lmv.math.cnrs.fr/evenenement/edp-cristobal-loyola-utinam-universite-marie-et-louis-pasteur/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261022T110000
DTEND;TZID=Europe/Paris:20261022T120000
DTSTAMP:20260924T084900Z
CREATED:20260924T083935Z
LAST-MODIFIED:20260924T084900Z
UID:15319-1792666800-1792670400@lmv.math.cnrs.fr
SUMMARY:CRYPTO : Paco Azevedo Oliveira
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/crypto-paco-azevedo-oliveira/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire CRYPTO
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261105T110000
DTEND;TZID=Europe/Paris:20261105T120000
DTSTAMP:20260924T084921Z
CREATED:20260924T084116Z
LAST-MODIFIED:20260924T084921Z
UID:15321-1793876400-1793880000@lmv.math.cnrs.fr
SUMMARY:CRYPTO : Yann Rotella
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/crypto-yann-rotella/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire CRYPTO
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261112T110000
DTEND;TZID=Europe/Paris:20261112T120000
DTSTAMP:20260924T084948Z
CREATED:20260924T084221Z
LAST-MODIFIED:20260924T084948Z
UID:15323-1794481200-1794484800@lmv.math.cnrs.fr
SUMMARY:CRYPTO : Simon Demarty
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/crypto-simon-demarty/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire CRYPTO
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261112T140000
DTEND;TZID=Europe/Paris:20261112T150000
DTSTAMP:20260917T131853Z
CREATED:20260903T080243Z
LAST-MODIFIED:20260917T131853Z
UID:15036-1794492000-1794495600@lmv.math.cnrs.fr
SUMMARY:EDP : Charles Dapogny (Laboratoire Jacques-Louis Lions\, CNRS\, Sorbonne Université)
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/edp-programme-a-venir/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261112T153000
DTEND;TZID=Europe/Paris:20261112T163000
DTSTAMP:20260917T132000Z
CREATED:20260917T132000Z
LAST-MODIFIED:20260917T132000Z
UID:15307-1794497400-1794501000@lmv.math.cnrs.fr
SUMMARY:EDP :  Xavier Blanc (Laboratoire Jacques-Louis Lions\, CNRS\, Université Paris Diderot)
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/edp-xavier-blanc-laboratoire-jacques-louis-lions-cnrs-universite-paris-diderot/
CATEGORIES:Séminaire EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261119T110000
DTEND;TZID=Europe/Paris:20261119T120000
DTSTAMP:20260924T085009Z
CREATED:20260924T084437Z
LAST-MODIFIED:20260924T085009Z
UID:15325-1795086000-1795089600@lmv.math.cnrs.fr
SUMMARY:CRYPTO : Guilhem Jazeron
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/crypto-guilhem-jazeron/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire CRYPTO
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261126T090000
DTEND;TZID=Europe/Paris:20261126T120000
DTSTAMP:20260924T085032Z
CREATED:20260924T084559Z
LAST-MODIFIED:20260924T085032Z
UID:15327-1795683600-1795694400@lmv.math.cnrs.fr
SUMMARY:CRYPTO : Demi Journée side channel
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/crypto-demi-journee-side-channel/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire CRYPTO
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261203T110000
DTEND;TZID=Europe/Paris:20261203T120000
DTSTAMP:20260924T084725Z
CREATED:20260924T084725Z
LAST-MODIFIED:20260924T084725Z
UID:15329-1796295600-1796299200@lmv.math.cnrs.fr
SUMMARY:CRYPTO
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/crypto/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire CRYPTO
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261210T080000
DTEND;TZID=Europe/Paris:20261210T170000
DTSTAMP:20260903T080340Z
CREATED:20260903T080340Z
LAST-MODIFIED:20260903T080340Z
UID:15038-1796889600-1796922000@lmv.math.cnrs.fr
SUMMARY:EDP : Eric Cancès (CERMICS\, Pont ParisTech)
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/edp-eric-cances-cermics-pont-paristech/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261210T110000
DTEND;TZID=Europe/Paris:20261210T120000
DTSTAMP:20260924T084807Z
CREATED:20260924T084807Z
LAST-MODIFIED:20260924T084807Z
UID:15331-1796900400-1796904000@lmv.math.cnrs.fr
SUMMARY:CRYPTO
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/crypto-2/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire CRYPTO
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261210T153000
DTEND;TZID=Europe/Paris:20261210T163000
DTSTAMP:20260903T080655Z
CREATED:20260903T080447Z
LAST-MODIFIED:20260903T080655Z
UID:15223-1796916600-1796920200@lmv.math.cnrs.fr
SUMMARY:EDP : Bertrand Maury (IMO\, Paris Saclay)
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/edp-bertrand-maury-imo-paris-saclay/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire EDP
END:VEVENT
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