METHOD FOR CHANGING THE CONTROL DATA OF A CHIP CARD, AND CHIP CARD SYSTEM

摘要

The invention relates to a method for changing the control data of a chip card (110). The chip card has a chip card operating system (100) with a hierarchical chip card file system, a protected non-volatile electronic storage unit (124) to which external access is only possible via a processor (114) of the chip card, and a volatile working storage unit (120). The chip card file system contains index files (DFs) and data files (EFs), and a file tree consisting of at least one index file (126) and multiple data files (132, 140,...) is stored in the protected electronic storage unit. Control data (144) for useful data (150) is stored in at least one of the files, the useful data is stored in a storage area of the protected electronic storage unit, and a pointer (146) is stored in said storage area in the at least one data file (140). The chip card is activated for an active operation, and a copy (156) of at least one sub-tree, which contains the file (140), of the data tree in the chip card is temporarily stored in the working storage unit (120); changed control data (144') is stored in the at least one file of the copied sub-tree; the changed copy of the sub-tree is permanently stored in the protected electronic storage unit and activated; and the original sub-tree is deleted or deactivated.