Orange

France Telecom

Philippe Legay

Jean Cartigny

Abderrahim Ramdane

Raffi Basmadjian

Laurent Topart

Jérôme Descos

Ghassen Jendoubi

A method for certifying an electronic document by a certifying peer device in a network of peers storing copies of a chain of blocks according to a 'blockchain'. The method includes: authenticating a peer device issuing this document; generating, for the issuing peer device, a one-time use public key/private key pair; dispatching, to the issuing peer device, a message including the public key and the address of an intelligent contract in the chain; receiving a block of the chain and detecting, in this block, an event representing a writing into the intelligent contract, of an imprint of a document issued by the issuing device and a signature of this imprint; verifying the signature with the private key; dispatching a transaction to the peer devices requesting them to execute a function of the intelligent contract to record in a block of the chain information representing certification by the certifying peer device.

Method and server for certifying an electronic document

An optoelectronic system comprising at least three sections corresponding to specific respective functions and having different respective band gap energies, at least for the adjacent pairs of sections. These three sections consist of at least two layers superposed by epitaxy. The upper layer is etched in order to define said sections in the form of two separate end sections defined in the upper layer on each side of an intermediate section defined in the lower layer, and to allow coupling between the intermediate section and each of the end sections which flank it, by evanescent coupling. The length of the intermediate section is such that the product K&times;L, in which K represents the coupling coefficient of a grating of the intermediate section, is one of the order of 1.

Optoelectronic system comprising several sections having respective functions coupled by evanescent coupling and production process

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Louannec, France

Philippe Legay