Authentication method for vehicle number plate recognition comprising at least the following preliminary phases initiated by an owner of a vehicle: a. entering at least one authentic vehicle number plate in an archive of authentic vehicle number plates for which is provided a service of authentication of a vehicle number plate recognition, b. and associating to said number plate at least one radio-mobile address corresponding to at least one radio-mobile terminals, accessible via a radio-mobile network through its corresponding radio-mobile address, and said at least one radio-mobile terminal frequently circulate in association with the vehicle to which the authentic plate corresponding to said authentic plate number is attached; and at least the following operating phases performed to carry out said service of authentication of a number plate recognition: c. automatically optically recognizing, by a local license plate recognition system, a vehicle number plate; d. sending to an authentication center, by said local license plate recognition system, an authentication request containing the recognized vehicle plate number; e. sending to said authentication center, by said local license plate recognition system, together with said authentication request, information relating to the place and the time where the recognition of the vehicle number plate took place; f. checking by the authentication center that such recognized vehicle plate number corresponds to the number of an authentic plate previously entered in said archive of authentic plates for which an authentication service is provided; g. in the case of the recognized vehicle plate number corresponding to an authentic plate which belongs to said archive of authentic plates for which an authentication service is provided, acquiring, by the authentication center, at least one radio-mobile address corresponding to said at least one radio-mobile terminal which was previously associated to said recognized vehicle plate number, as in phases "a." and "b."; h. checking by the authentication center that, at the same time in which the recognition of the vehicle number plate happened, said at least one radio-mobile address corresponding to said at least one radio-mobile terminal is localized in a location area of the mobile network in which it is registered, the location area being given by the analysis of the received radio base stations or by a satellite locator incorporated in said at least one radio-mobile terminal, and said location area comprises the place where the recognition of the vehicle number plate was achieved, i. in the case of positive check in phase h., associating by the authentication center to the recognized plate number an additional piece of information, which states that the recognized vehicle number plate is authentic. a. entering at least one authentic vehicle number plate in an archive of authentic vehicle number plates for which is provided a service of authentication of a vehicle number plate recognition, b. and associating to said number plate at least one radio-mobile address corresponding to at least one radio-mobile terminals, accessible via a radio-mobile network through its corresponding radio-mobile address, and said at least one radio-mobile terminal frequently circulate in association with the vehicle to which the authentic plate corresponding to said authentic plate number is attached; c. automatically optically recognizing, by a local license plate recognition system, a vehicle number plate; d. sending to an authentication center, by said local license plate recognition system, an authentication request containing the recognized vehicle plate number; e. sending to said authentication center, by said local license plate recognition system, together with said authentication request, information relating to the place and the time where the recognition of the vehicle number plate took place; f. checking by the authentication center that such recognized vehicle plate number corresponds to the number of an authentic plate previously entered in said archive of authentic plates for which an authentication service is provided; g. in the case of the recognized vehicle plate number corresponding to an authentic plate which belongs to said archive of authentic plates for which an authentication service is provided, acquiring, by the authentication center, at least one radio-mobile address corresponding to said at least one radio-mobile terminal which was previously associated to said recognized vehicle plate number, as in phases "a." and "b."; h. checking by the authentication center that, at the same time in which the recognition of the vehicle number plate happened, said at least one radio-mobile address corresponding to said at least one radio-mobile terminal is localized in a location area of the mobile network in which it is registered, the location area being given by the analysis of the received radio base stations or by a satellite locator incorporated in said at least one radio-mobile terminal, and said location area comprises the place where the recognition of the vehicle number plate was achieved, i. in the case of positive check in phase h., associating by the authentication center to the recognized plate number an additional piece of information, which states that the recognized vehicle number plate is authentic.