SYSTEM AND METHOD FOR SECURING DATA

摘要

The invention relates to a system and method for securing data. According to the invention, the system is characterised in that it consists of: a monotonic counter; a computing entity; a physical data medium including one or more data blocks (DBk1, DBk2, DBk3, DBk4), a first master block (MBk1) comprising the last value (V_last) retrieved from the monotonic counter, an identifier (ID_last) of the last data block (DBk) written on the medium, a first authentication code (Auth_A) guaranteeing the authenticity of the written data block(s), a second authentication code (Auth_B) calculated from the last written data block, said data being fixed to a neutral value, and a third authentication code (Auth_C) guaranteeing the authenticity of the first master block (MBk1), and a second master block (MBk2) forming a replica of the first master block (MBk1); and an authentication key (15). The invention is particularly suitable for securing data against playback and sudden interruptions in service in embedded systems.