Integrated circuit board with secured input/output buffer

摘要

An integrated circuit card including a processor unit associated with RAM and with data exchange means for exchanging data with an external device, the RAM including a memory zone dedicated to exchanged data, and the processor unit being arranged to secure the dedicated memory zone and to store the exchanged data in said zone, and a method of managing the RAM of such a card.

主权项

1. An integrated circuit card including a processor unit associated with RAM and with data exchange means for exchanging data with an external device,
wherein the RAM includes only one dedicated memory zone dedicated to exchanged data, wherein said only one dedicated memory zone is less than an entirety of the RAM and is bounded so that it cannot be extended during operation of the processor unit, wherein only the exchanged data is stored in the only one dedicated memory zone, wherein the only one dedicated memory zone must store all of the exchanged data, the processor unit being arranged to store any data that is exchanged between the integrated circuit card and the external device in said only one dedicated memory zone, and wherein the processor unit is arranged to limit any risk of said only one dedicated memory zone containing data that is harmful for security of the integrated circuit card by being programmed to scramble the data in the only one dedicated memory zone before transferring data from the outside in order that data received on successive occasions by the card cannot be recombined or used to constitute harmful instructions.