Writing Data in a Non-Volatile Memory of a Smart Card

A smart card (SC) comprising a non-volatile memory (EEPROM), a volatile memory (RAM), a buffer (BUF) within the volatile memory, and a circuit (PROC, ROM) for processing write commands in non-volatile memory, said circuit (PROC, ROM) being arranged to process a command stored in the buffer (BUF) and associated with an identification parameter identifying an object stored in the non-volatile memory (EEPROM) where the command is to write to, said circuit (PROC, ROM) being arranged to store, in the non-volatile memory (EEPROM), on the one hand an identification parameter (FID) of an object (EF), the object (EF) being stored in the non-volatile memory (EEPROM), and on the other hand a predefined address (ADDR) within the object (EF), the circuit (PROC, ROM) being arranged, when processing a write command, to compare the object identification parameter associated with the write command with the object (EF) identification parameter (FID) stored in the non-volatile memory (EEPROM), and, if the comparison is positive, to write the data to be written, embedded in the write command, from the buffer (BUF) to the object associated with the write command, at the predefined address (ADDR) stored in the non-volatile memory (EEPROM), calculate an address corresponding to the sum of the stored predefined address (ADDR) and the size of the written data, as well as store the calculated address in the non-volatile memory (EEPROM) in place of the predefined address (ADDR), the circuit (PROC, ROM) being arranged, if the comparison is negative, to write the data to be written, embedded in the write command, from the buffer (BUF) to the object associated with the write command, at a default address, calculate an address corresponding to the sum of the default address and the size of the written data, and store the calculated address in the non-volatile memory (EEPROM) as the predefined address.