Idemia Identity & Security France

Idemia Identity & Security

Pierrick Bieules

Lauren Marjorie Del Giudice

Anthony Fonteneau

Rëmi Louis Marie Duclos

Rémi Louis Marie Duclos

The disclosure relates to a collecting method implemented by a first device including a first volatile memory, this first device interacting with a second device including a second non-volatile memory, the memories comprising objects each constituting an instance of an object-oriented language class. The method comprises an analysis of the objects by running through an object tree from the persistent roots; and on detecting that the analysis is finished, a collecting from the first and second memories for deleting each object that has not been analyzed during said analysis. This analysis in particular comprises, for each object: the identification of each reference pointing to another object; and the definition of a first or second type for each identified reference, this analysis continuing only along the references of the first type.

Data collector in an electronic device

A secure element and method for backup of data stored in a non-volatile memory of the secure element. The method for backup of data includes de-fragmenting an area of the non-volatile memory so as to form, in the area, an occupied region and a free region. The method further includes compressing the portion of data contained in the occupied region, after de-fragmentation, and compressing the contents of the free region using a compression algorithm that is different from the one used for compressing the portion of data contained in the occupied region. In one embodiment, the occupied region is compressed using a dictionary, and the free region is compressed by applying run-length encoding (RLE). The method also includes generating a backup image containing the compressed portion of data and the compressed contents of the free region, and writing the backup image into the nonvolatile memory. The area may contain objects to be handled by a program coded in an object language. Metadata for each area may also be generated and stored in the nonvolatile memory. A method of restoring data, including configuring the secure element in a busy mode to avoid corruption of the contents, and a method for resetting the secure element, are also disclosed.

Secure element including a non-volatile memory and methods for saving and restoring data including defragmenting and compressing data stored in occupied and free regions

Growing community of inventors

Issy les Moulineaux, France

Pierrick Bieules