Method of enrolling data to control an identity, and identity-control method

An identity control method comprising steps of:

• acquiring a control image showing a photograph, the photograph itself showing a first individual,
• extracting from the control image and by an image-processing algorithm a characteristic of the control image other than a biometric model, wherein the image-processing algorithm is configured to:
• extract, from any image showing a photograph itself showing the first individual, a characteristic which differs from the characteristic of the control image by a deviation less than a determined threshold,
• extract, from any image not showing the first individual, a characteristic which differs from the characteristic of the control image by a deviation greater than the determined threshold,
• obtaining personal data of a second individual other than by the image-processing algorithm,
• generating a control datum from the characteristic of the control image and from the obtained personal data,
• reading, in a database, an encoded datum and of a hash of a random datum associated with a reference individual,
• computing a decoded datum by application of a decoding procedure to the control datum and to the read encoded datum,
• applying a predetermined cryptographic function to the decoded datum so as to produce a hash of the decoded datum,
• comparing the obtained hash and the read hash,
• outputting a control identity result indicating whether the first individual and the second individual both correspond to the reference individual or not, as a function of the comparison.