METHOD OF MULTIMODAL AUTHENTICATION WITH THRESHOLD AND GENERATION OF UNIMODAL KEY

摘要

The invention relates to a method for authenticating one or more users in which sketches s(modi) are defined, the "key" to be used for a function for sharing a secret is determined, for each of the modalities Mod1 to Modn-1, the modality i is measured Modi 200i, then said measurement w'(modi) is processed 203i using the associated sketch s(modi) 202i, the value of s(modn) is retrieved 206 on the basis of said known key and on the basis of the (at least) k different values w(modi) which are valid and of a function f for sharing a secret 205 so as to reconstruct the sketch s(modn) of the modality n, the noisy value of the modality n is measured, so as to obtain w'(modn) 207, and said data item is processed so as to retrieve the value w(modn), 209, and on the basis of this value w(modn), a unimodal cryptographic key K is determined, 210.