1. A system for audio authentication of an individual or speaker comprising: a sensor for one or more audio parameters associated with the said individual; an extraction module for the acoustic parameters from the audio signal, a mean model or mean super-vector M representative of the population to be authenticated; a reference database; a database containing the public keys Kpub(1) of the individuals to be authenticated; and a processor adapted for: decomposing audio signals received by the sensor into vectors representative of the speaker I to be authenticated, transforming the super-vector V of the speaker I resulting from the concatenation of the vectors associated with the said speaker I into binary data 1001100. .. 0 taking as an input the mean super-vector M resulting from the mean super-vector, and comparing the super-vector V of the speaker with the mean super-vector M; and transmitting the binary data to a module for extracting the speaker authentication taking as an input the public keys Kpub(1) in order to at least one of authenticate the speaker and generate a cryptographic data item Ksec(1) associated with the said speaker I.