Detection of suspect software objects and signatures after...

G - Physics – 06 – F

Patent

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G06F 21/00 (2006.01) H04N 5/44 (2006.01)

Patent

CA 2383700

In a system for authenticating a downloaded software object, a technique is provided to determine whether a failed authentication resulted from a suspect downloaded object or a suspect signature for the downloaded object which was communicated separately. A secret compact transformation function that operates on the signature is used to generate a value indicative of the signature at the software object transmission facility. The inverse function is used at the user terminal, such as a television set-top box, which receives the downloaded software object. Multiple transmission of the value can be provided for redundancy. The system is particularly useful in analyzing actual or attempted attacks on the security of the software object download scheme.

L'invention concerne un procédé permettant, dans un système d'authentification d'un logiciel téléchargé, de déterminer si l'échec de l'authentification est dû à la nature suspecte de l'objet logiciel téléchargé ou si une signature suspecte dudit objet a été communiquée séparément. On utilise une fonction de transformation compacte et secrète, agissant sur la signature, afin de générer une valeur indicative de la signature au niveau de l'outil de transmission de l'objet logiciel. On utilise la fonction inverse au niveau du terminal utilisateur, tel qu'un décodeur T.V., afin de recevoir ledit objet téléchargé. Un transmission multiple de ladite valeur est possible pour la redondance. Ce système est particulièrement utile pour analyser les attaques ou les tentatives d'attaques à la sécurité du mécanisme de téléchargement du logiciel.

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