Method for checking persons, wherein various checking and/or inspection steps are implemented at various check and/or inspection points intended to be passed by a person, the method being implemented by a system comprising said check and/or inspection points, disposed in an inspection zone to be passed in order to access a zone with secure access, characterised by the implementation of the following operations: - during the passage of a person through a first check and/or inspection point: -- acquisition of biometric data of the person, -- generation of a secure identity token, the token being an encrypted biometric signature obtained from a piece of biometric data acquired from the person, -- generation of a public identifier associated with said token, and storage of said identifier in a database memorising the public identifiers in association with the identity tokens or the data from which they are generated, - during the passage of a person through at least one check and/or inspection point, -- acquisition of a piece of biometric data from the same biometric trait or traits as those from which the piece of biometric data was acquired during the passage through the first check point and from which the identity token was generated, -- obtaining, from said piece of biometric data, of an encrypted piece of biometric data by execution of the same encryption protocol as that implemented in order to obtain the secure token, -- determination of the public identifier of the person, by implementing an authentication of said person by comparison of the encrypted piece of biometric data to the secure identity token, the comparison being implemented by means of a secure calculation protocol, -- association (1130, 1240), with the public identifier of a person, of security information specific to said person and/or to the check and/or inspection processing implemented at said point, and -- memorisation of this information with said public identifier in the database. - during the passage of a person through a first check and/or inspection point: -- acquisition of biometric data of the person, -- generation of a secure identity token, the token being an encrypted biometric signature obtained from a piece of biometric data acquired from the person, -- generation of a public identifier associated with said token, and storage of said identifier in a database memorising the public identifiers in association with the identity tokens or the data from which they are generated, -- acquisition of biometric data of the person, -- generation of a secure identity token, the token being an encrypted biometric signature obtained from a piece of biometric data acquired from the person, -- generation of a public identifier associated with said token, and storage of said identifier in a database memorising the public identifiers in association with the identity tokens or the data from which they are generated, - during the passage of a person through at least one check and/or inspection point, -- acquisition of a piece of biometric data from the same biometric trait or traits as those from which the piece of biometric data was acquired during the passage through the first check point and from which the identity token was generated, -- obtaining, from said piece of biometric data, of an encrypted piece of biometric data by execution of the same encryption protocol as that implemented in order to obtain the secure token, -- determination of the public identifier of the person, by implementing an authentication of said person by comparison of the encrypted piece of biometric data to the secure identity token, the comparison being implemented by means of a secure calculation protocol, -- association (1130, 1240), with the public identifier of a person, of security information specific to said person and/or to the check and/or inspection processing implemented at said point, and -- memorisation of this information with said public identifier in the database. -- acquisition of a piece of biometric data from the same biometric trait or traits as those from which the piece of biometric data was acquired during the passage through the first check point and from which the identity token was generated, -- obtaining, from said piece of biometric data, of an encrypted piece of biometric data by execution of the same encryption protocol as that implemented in order to obtain the secure token, -- determination of the public identifier of the person, by implementing an authentication of said person by comparison of the encrypted piece of biometric data to the secure identity token, the comparison being implemented by means of a secure calculation protocol, -- association (1130, 1240), with the public identifier of a person, of security information specific to said person and/or to the check and/or inspection processing implemented at said point, and -- memorisation of this information with said public identifier in the database.