Abstract: A device accesses a reference graphical item sequence. The reference graphical item sequence is known only to the first user. The device requests a user to point consecutively to at least one area in which at least one graphical item is included. The device presents a sequence of at least one graphical item. The device captures a sequence of at least one area pointed to by the user by detecting at least one predetermined change relating to at least one physical user feature to validate at least one user pointed area. The device verifies whether the sequence of the at least one user pointed area includes the reference graphical item sequence. The device authenticates the user only if the sequence of the at least one user pointed area includes the reference graphical item sequence.

Abstract: The invention is a method of protecting a data intended to be accessed by an operating system embedded in an electronic device. The operating system is intended to manage an object comprising a header and a body. The data is stored in the body. The object is recorded in a memory of the electronic device. The electronic device comprises a memory manager able to provide access to the memory. The memory manager forbids the operating system to access the body as long as a preset action has not been successfully performed.