Method for authenticating and/or checking the integrity of a subject

A method for visual authentication and/or visual checking of integrity, the method comprising:

• visually superimposing, optically or electronically:
• on the one hand, at least one image, called authentication image, of at least one authentication area of an authentic subject, the authentication image comprising at least one continuous random component texture, and
• on the other hand, the authentication area itself of a candidate subject or at least one verification image of the authentication area of the candidate subject,
• in case of observation, on the image resulting from the superimposition, of an optical phenomenon of the Glass pattern type at the authentication area, concluding that the candidate subject is the authentic subject and/or in the at least partial integrity of the authentication area of the authentic subject,
• wherein the authentication image is recorded by applying to this latter a matrix or a grid of cells whose internal surface is formed by the corresponding part of the authentication image and that are separated by a surface unrelated to the authentication image and in that, before the recording of the authentication image, certain at least of the cells undergo a geometric transformation of the image contained in the corresponding cell.