Orange

Fondation B Com

B-Com

Gaëtan Le Guelvouit

Renaud Cazoulat

Alexandre Garel

Francois Daude

Sophie Boutiton

Valérie Denis

A method for inserting information into a first image including Nrows×Mcolumns of elements includes: a) obtaining, from the first image, a second image including Nrows×Mcolumns, N≤Nand M≤M, b) generating initial information including Nrows×Mcolumns, c) obtaining intermediate information including Nrows×Mcolumns of elements, so N≥Nand M≥M, and N=kx·Nand M=ky·M, kx and ky being integers ≥1, the elements organized into blocks, d) obtaining information to be inserted from the intermediate information, including: generating symbols representing noise, including as many symbols as block elements, at least one < >0, so the result of a function applied to the symbols=a chosen value, adding each symbol to the corresponding block element, and e) inserting the obtained information into the first image.

Method for inserting information into an image and corresponding device

A method for authenticating a user of a terminal equipment connected to a communication network, for access from this terminal equipment to a remote service hosted by a server equipment connected to the network. The method includes the following steps, implemented by the server: authenticating the user from credentials; in the event of successful user authentication, authenticating the client equipment from credentials stored in a first memory of the server in association with the user's credentials, including a command to render a first pattern, the command including parameters describing the first pattern and rendering the first pattern received from the client equipment, so-called reference pattern; deciding on authenticating the client equipment according to the evaluated score, a successful authentication being decided when the match score is greater than a predetermined threshold; and following the authentication decision, updating the credentials of the terminal equipment.

Method for authenticating a terminal equipment, device, server equipment and related computer program

A method for watermarking a sequence of images is provided. The method implements the following steps, for at least one current image: comparing the current image with a preceding image of the sequence, delivering a difference image representing a motion between the preceding image and the current image; if the difference between the current image and the preceding image is above a predetermined threshold, watermarking the current image by inserting a message comprising a field carrying an identifier of the current image and a field carrying a soft hash obtained from at least one portion of the difference image; and if not, watermarking the current image by inserting a message comprising a field carrying an identifier of the current image.

Method and device for watermarking a sequence of images, method and device for authenticating a sequence of watermarked images and corresponding computer program

Processing data for encoding and decoding a message transmitted through a communication channel having adjacent information known during the encoding, the encoding method comprising the construction of a surjective correcting code produced from a characterization of the adjacent information in a system of spherical coordinates.

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Thorigné-Fouillard, France

Gaëtan Le Guelvouit