Method for storing, authenticalting and executing an...

Details Method for storing, authenticalting and executing an... Method for storing, authenticalting and executing an...

H - Electricity

04

N

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

Patent

CA 2548546

Conventionally, when the version of a program has been upgraded, the whole of a currently stored program needs to be deleted to be replaced by a new program, and authentication needs to be performed again on such new program when it is activated. However, since the whole of the program is required to be stored and authenticated even when only a part of such program has changed, it consumes time and leads to the decrease in responsiveness. In order to solve this problem, the present invention extracts a difference between a new program and a currently stored old program, when such new program is to be stored, and the new program is to be stored after authentication is performed only on such difference.

Quand la version d'un programme a été améliorée, il est habituellement nécessaire d'effacer la totalité d'un programme mémorisé afin de le remplacer par un nouveau programme et l'authentification doit être effectuée de nouveau sur ce nouveau programme au moment de l'activation de ce dernier. Cependant, étant donné que la totalité du programme doit être nécessairement mémorisée et authentifiée, même en cas de modification d'une partie seulement de ce programme, cette mémorisation et cette authentification demandent un temps important et diminuent la sensibilité du programme. Dans le but d'apporter une solution à ce problème, l'invention consiste à extraire une différence entre un nouveau programme et un programme ancien mémorisé, au moment de la mémorisation de ce nouveau programme, ce qui est effectué après que l'authentification a été exécutée sur la base de cette différence seulement.

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