Secure loading of different applications onto a chipcard (IC card) which has already been issued. The chipcard has a memory with a file structure comprising a plurality of subdomains. A terminal sends at least one command to the chipcard which can be a CREATE_FILE command, shown, to create new files and new file directories in the existing file structure, or a command to read and/or write data to the memory. The use of the command is limited to particular subdomains by means of an identifier allocated to the command, where the identifier comprises identification data containing information on the file directories in which the command can be used. Alternatively, if several commands are to be certified for a particular subdomain, an identifier can be allocated to the subdomain (fig. 3). Security codes such as cryptographic keys or passwords can similarly be limited to particular subdomains.
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