METHOD OF SENDING AN EXECUTABLE CODE TO A RECEPTION DEVICE AND METHOD OF EXECUTING THIS CODE

摘要

The present invention relates to a method of sending an executable code to a security module connected locally to a reception device, this security module comprising a microcontroller and a memory, said memory comprising at least one executable area designed to contain instructions that can be executed by said microcontroller and at least one nonexecutable area in which the microcontroller cannot execute the instructions, characterized in that it comprises the steps of separating the executable code into blocks; of adjoining at least one block management code to said blocks so as to form an extended block; of introducing the content of an extended block into a message of a type envisaged for being processed in the reception device, in such a way that all of the executable code is contained in a plurality of messages; of sending a message to the reception device, this message containing one of the distinct extended blocks of the first extended block; of processing said message so as to extract the extended block therefrom; of storing in the executable area of the memory, the executable code and said at least one code for managing the block received; of executing at least one management code for said extended block, this management code having the effect of transferring the content of the block into a nonexecutable area of the memory; of repeating the previous steps until all the extended blocks have been stored in the memory with the exception of the first block; of sending a message containing the first extended block to the reception device; of processing said message so as to extract the extended block therefrom and of storing the executable code of the block received, in the executable area of the memory. The invention also relates to a method of executing this code.