System for managing at least one authentication datum for access to a service, comprising - an access equipment for access to at least one service, - a mobile terminal including a secure identification card comprising management means for managing both said authentication datum and an identifier of said service, said management means forming means for storing and rendering service identifiers or service identifier digests, and authentication data that are recorded together with an identifier of a service or with a digest of an identifier of said service during a prior access to said service, - a communication interface between said access equipment and said management means, - a software interface capable of: • automatically detecting a request for at least one authentication datum for an access to a service, the access being requested by a user by means of said access equipment, • accessing the secure identification card through the communication interface in order to determine whether an identifier of said service, or a digest of an identifier of said service, is stored in said management means, characterized in that the software interface is capable of: • implementing said management means to obtain an authentication datum, stored beforehand in the management means during a first access to the service after a detection of a prior authentication-datum request and requested for said access, the obtained authentication datum being associated with the determined identifier of said service or with the determined digest of the identifier of said service. - an access equipment for access to at least one service, - a mobile terminal including a secure identification card comprising management means for managing both said authentication datum and an identifier of said service, said management means forming means for storing and rendering service identifiers or service identifier digests, and authentication data that are recorded together with an identifier of a service or with a digest of an identifier of said service during a prior access to said service, - a communication interface between said access equipment and said management means, - a software interface capable of: • automatically detecting a request for at least one authentication datum for an access to a service, the access being requested by a user by means of said access equipment, • accessing the secure identification card through the communication interface in order to determine whether an identifier of said service, or a digest of an identifier of said service, is stored in said management means, characterized in that the software interface is capable of: • implementing said management means to obtain an authentication datum, stored beforehand in the management means during a first access to the service after a detection of a prior authentication-datum request and requested for said access, the obtained authentication datum being associated with the determined identifier of said service or with the determined digest of the identifier of said service. • automatically detecting a request for at least one authentication datum for an access to a service, the access being requested by a user by means of said access equipment, • accessing the secure identification card through the communication interface in order to determine whether an identifier of said service, or a digest of an identifier of said service, is stored in said management means, • implementing said management means to obtain an authentication datum, stored beforehand in the management means during a first access to the service after a detection of a prior authentication-datum request and requested for said access, the obtained authentication datum being associated with the determined identifier of said service or with the determined digest of the identifier of said service.