Abstract: The present invention concerns a method for securing data transmitted by a data source (2) of a connected object (1) against attacks affecting a control circuit (4) of the connected object (1), the connected object (1) also comprising an electronic signature circuit (6) and a communication bus (8) connected to the control circuit (4), connected to the electronic signature circuit (6) and connected to the source (2), wherein the method comprises the following steps implemented by the electronic signature circuit (6): detecting (602) a first datum (M) transmitted by the source (2) on the communication bus (8); detecting (606) a second datum (M?) to be signed, on the communication bus, the second datum having been transmitted (404) by the control circuit (4) on the communication bus (8) after detection of the first datum (M) by the control device (4); verifying (608) coherence between the detected data (M, M?), signalling (610) an error (E), if any, as a function of a result of the verification.

Abstract: The present invention relates to a device (1) such as a connected object comprising a first electronic circuit (2) comprising: a first processing unit (6) for executing a program, a first memory (8) for memorizing data during the execution of the program, a debug port (10) dedicated to checking the execution of the program from outside the first circuit, a second electronic circuit (4) connected to the debug port (10), comprising: a second memory (14) memorizing reference data related to the program, a second processing unit (12) for implementing the following steps automatically and autonomously via the debug port (10): checking the integrity of the data memorized by the first memory (8) and/or the compliance of the program's execution by the first processing unit (6) with a reference execution, assisted by the reference data.

Abstract: The present invention concerns a method for securing data transmitted by a data source (2) of a connected object (1) against attacks affecting a control circuit (4) of the connected object (1), the connected object (1) also comprising an electronic signature circuit (6) and a communication bus (8) connected to the control circuit (4), connected to the electronic signature circuit (6) and connected to the source (2), wherein the method comprises the following steps implemented by the electronic signature circuit (6): detecting (602) a first datum (M) transmitted by the source (2) on the communication bus (8); detecting (606) a second datum (M?) to be signed, on the communication bus, the second datum having been transmitted (404) by the control circuit (4) on the communication bus (8) after detection of the first datum (M) by the control device (4); verifying (608) coherence between the detected data (M, M?), signalling (610) an error (E), if any, as a function of a result of the verification.