1. A method of biometric authentication of a user, comprising the steps of: storing, in a first device, a first data set derived from a biometric attribute of a reference user; obtaining, by a second device, a second data set representative of the biometric attribute of a test user to be authenticated; using the first data set as a set of parameters of a statistical classifier to generate a trained statistical classifier; providing the second data set as input to the trained classifier; and determining, from the trained classifier output corresponding to said input, a degree of correlation between the biometric attribute of the reference user and the biometric attribute of the test user to be authenticated.