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  • This session has been presented June 04, 2010.

Description

  • Speaker

    Stéphanie Dib - Institut mathématiques de Luminy

Dans le contexte de la cryptographie, la non-linéarité des fonctions booléennes est un critère essentiel pour résister aux attaques linéaires. Comme il y a beaucoup plus d'approximations quadratiques que d'approximations linéaires, il est nécessaire aussi de considérer la non-linéarité d'ordre 2. Dans cet exposé, nous étudions la distribution de la non-linéarité des fonctions booléennes, ainsi que celle d'ordre 2. De plus, comme les codes de Reed-Muller sont liés aux fonctions booléennes, nous étudions la relation entre la non-linéarité et le décodage au delà de la moitié de la distance minimale. Nous trouvons un seuil de décodage au delà duquel il devient impossible de décoder correctement. Ce travail est effectué en collaboration avec François Rodier.

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