Method for authenticating and executing an application program

Details Method for authenticating and executing an application program Method for authenticating and executing an application program

H - Electricity

04

N

H04N 7/16 (2006.01) H04N 5/00 (2006.01) H04N 7/24 (2006.01)

Patent

CA 2542392

According to a conventional technique, in the case where a program is stored into a non-volatile memory once and then activated, authentication of the program is performed immediately before such activation. However, calculations such as decryption of encrypted values are required before the activation of the program starts, which causes the problem that responsiveness is decreased in proportion to the time required for calculations. In order to solve this problem, authentication of a program is performed immediately before such program is stored, so that no authentication is performed or only a part of the authentication is performed to verify the validity of certificates at program activation time.

Selon une technique classique, lorsqu'un programme est stocké une fois dans une mémoire rémanente, puis activé, l'authentification du programme est effectuée immédiatement avant l'activation. Toutefois, des calculs tels que le décryptage de valeurs cryptées sont requis avant que ne débute l'activation du programme, ce qui entraîne comme problème une baisse de la réactivité par rapport au temps requis pour les calculs. Selon la présente invention, pour résoudre ce problème, l'authentification d'un programme est effectuée immédiatement avant la mise en mémoire de ce programme, si bien qu'aucune authentification n'est effectuée ou qu'une partie uniquement de l'authentification est effectuée pour vérifier la validité de certificats au moment de l'activation du programme.

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