Abstract: The invention relates to a system and method for making data secure. The inventive system is characterized in that it comprises:—a monotonic counter;—a computational entity;—a physical data medium comprising one or a plurality of data blocks, a first master block comprising the last value recovered from the monotonic counter, an identifier of the last data block written on said medium, a first authentication code guaranteeing the authenticity of the written data block or blocks, a second authentication code calculated from the last written data block, said data being fixed at a neutral value, and a third authentication code guaranteeing the authenticity of the first master block, and a second master block forming a replica of the first master block; and—an authentication key. The invention is used, in particular, to make data secure against playback and sudden interruptions in service in embedded systems.

Abstract: The invention relates to a method for securing a user interface that comprises a user interface including one or more peripheral hardware devices of the user interface for interaction with said interface, said peripheral hardware devices being driven by driver software, and one or more applications using the user interface. The invention also relates to a method for securing such an interface. The system of the invention is characterised in that the same further comprises a hypervisor and one or more virtual machines, the drivers of the peripheral hardware devices of the user interface being divided into two portions, i.e. a main portion of said drivers under the control of the hypervisor and a front-end portion of said drivers under the control of the virtual machines, wherein the front-end portion of the securing software component is in charge of managing the front-end portion of the drivers and the main portion of the securing software component is in charge of managing the main portion of the drivers.

Abstract: A method for loading, installing and running software, called loading units, having different levels of confidence by a data processing unit (1). The method includes at least associating at least one structure of information data concerning security requirements and characteristics of this loading unit with each loading unit (2, 3, 7); associating a dynamic data structure (10) representative of the state of security in the data processing unit (1) to the data processing unit (1); validating the security requirements and characteristics of each loading unit (2, 3, 7) with regard to the state in the data processing unit (1) contained in the dynamic data structure (10via an autonomous security module (9), and; if the validation is positive, authorizing, via the security module (9), the loading, installation or running of the loading unit (2, 3, 7).

Abstract: A secure system (1) for processing data includes a first device (2), and at least one second device (3) is characterized in that—each second device (3) comprises monitoring elements (7) suitable for transmitting operating information to the first device (2), and—the first device (2) includes elements (8) for storing a behavioral model of each second device (3) and elements (9) for comparing the operating information received from each second device (3) with the behavioral model so as to determine whether the operation of the second device (3) is compliant with the behavioral model stored, and validation elements (10) suitable for preventing the running of a sensitive operation on this second device or for instructing a change of state of the second device if the second device does not manifest compliant operation. A method and a computer program are also described.