Idemia Identity & Security France

Idemia Identity & Security

Olivier Clemot

Herve Chabanne

Julien Bringer

Hervé Chabanne

Emmanuel Prouff

Constance Morel

Julien Paul Keuffer

Thomas Chenevier

Laurent Lambert

The present invention relates to a method for controlling the identity of a user (U), comprising the following steps implemented by an identity-controlling device (): The public database is of blockchain type and the confidentiality-protected data generated by the identity-attesting device () are associated in the public database () with first transaction data indicating that the identity-attesting device () has transferred a predetermined amount of electronic currency to a recipient.

Method for controlling the identity of a user by means of a blockchain

The present invention relates to a method for generating an electronic signature of a document associated with a condensate obtained by a given hash function comprising performing by data-processing means () of a server () of steps of:

Method for generating an electronic signature of a document associated with a condensate

A method for generating a message signature intended to be validated by a verifier server. A client device is configured to hold a private key and a corresponding public key. The method includes offline pre-computation by a hardware security module of a signature token, a result of encryption using a homomorphic encryption function, storage of the signature token generation of the signature of the encrypted message by the homomorphic encryption function from the result of the encryption by the homomorphic encryption function of the private key stored by the client device, of the signature token and of the message. The signature is intended to be validated by the verifier server by the public key.

Method for generating a message signature from a signature token encrypted by means of a homomorphic encryption function

Growing community of inventors

Issy-les-Moulineaux, France

Olivier Clemot