Abstract: The invention relates to a registration method for future biometric verification purposes, including the following steps for one person (I): obtaining first biometric data (4) and second biometric data (5) relating to said person; obtaining alphanumerical data (a) including at least one identifier relating to said person; storing, in a first biometric database (1), the thus-obtained first biometric data in association with a decryption key (6); storing, in a correspondence table (T), first information from the thus-obtained second biometric data and alphanumerical data in correspondence with an index (j); storing, in a second database (2), second information from the thus-obtained second biometric data and alphanumerical data in association with a version (J) of said index that is encrypted with an encryption key corresponding to said decryption key, said second information being different from the first information.