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.