METHOD FOR MULTIMODAL AUTHENTICATION AND THE GENERATION OF A CRYPTOGRAPHIC KEY, USING GENERALISED SECURE SKETCHES

摘要

The invention relates to a method for the multimodal authentication of individuals, comprising the following steps: knowing a set of sketches for each of the modalities s(mod1,..., modi), measuring a fuzzy datum w'(mod1) (310), correcting the measurement of the first modality w'(mod1), transforming the corrected datum w(mod1) using a non-reversible transform function, correcting said i-th modality w'(modi) (317) by performing the following steps: using a first key Sk (i-1) obtained by applying the transform function to the modality w'(modi) in order to generate an extended datum w'e(modi) by increasing the size of the reference datum with k figures forming the key Sk (i-1); on the basis of the extended datum w'e(modi) and the sketch s(mod1,..., modi) (318), determining the denoised extended value we(mod1,..., modi); and using the word we(mod1,..., modn) in order to authenticate the user or object corresponding to n measured modalities or in order to generate a cryptographic key.