The invention relates to a method for generating a unique identifier of a subject from a genotyped DNA sample from said subject, the method comprising the steps of: obtaining a number N≥2 of genomic positions of interest, said obtained genomic positions being such that, in a population of M subjects, these genomic positions exhibit a polymorphism of at least one nucleotide having an allelic frequency of between 25% and 35%, for the minority allele; combining in pairs the obtained genomic positions by means of logical functions so as to obtain a binary code bc.