Patent ID: 8325971

Claim:
A method for extracting a random signature from a subject material element, comprising: a phase to generate at least one acquisition vector of structural characteristics of at least one region of the subject material element, application of a decomposition base, a decomposition phase of each acquisition vector according to the decomposition base to obtain an image vector containing random components which each correspond to the contribution in the acquisition vector of a decomposition vector belonging to the decomposition base, and in that each component of the random signature vector is obtained by extraction of and/or processing at least one random component of at least one image vector, after the decomposition phase, a phase to generate at least one random signature vector from the acquisition vector, the random signature vector comprising: at least one random component having a stable nature so that its value may be found on each implementation of the method on one same region of the subject material element, and/or at least one random component having an unstable nature so that its value is likely to vary random fashion on each implementation of the method on one same region of the subject material element, use of the random signature vector as random signature.