An assigning system for assigning device fixed identifiers to fuzzy identifiers, the assigning system comprising - a database storing multiple database records, each database record storing a fuzzy identifier, said fuzzy identifiers being noisy responses of physically unclonable functions, characterized in that the assigning system further comprises: - a network interface arranged to receive a fuzzy input identifier, the fuzzy input identifier being a noisy response of a physically unclonable function, - a matching unit arranged to - determine if a matching fuzzy identifier exists in the database that matches the fuzzy input identifier according to a matching criterion, and thereupon sending a matching signal to a fixed identifier determining unit i.e. a fixed identifier determiner, - determine if a matching fuzzy identifier does not exist in the database according to an absent criterion, and thereupon sending an absent signal to a database adding unit, - the database adding unit arranged to receive the absent signal, and upon said receiving, to add a database record to the database, said added database record storing the fuzzy input identifier, and further to send the matching signal to the fixed identifier determiner, and - the fixed identifier determiner arranged to receive the matching signal, and upon said receiving to determine a device fixed identifier from the database record storing the matching fuzzy identifier, wherein the device fixed identifier is assigned to the fuzzy identifier, wherein - the network interface is arranged to transmit the device fixed identifier. - a database storing multiple database records, each database record storing a fuzzy identifier, said fuzzy identifiers being noisy responses of physically unclonable functions, characterized in that the assigning system further comprises: - a network interface arranged to receive a fuzzy input identifier, the fuzzy input identifier being a noisy response of a physically unclonable function, - a matching unit arranged to - determine if a matching fuzzy identifier exists in the database that matches the fuzzy input identifier according to a matching criterion, and thereupon sending a matching signal to a fixed identifier determining unit i.e. a fixed identifier determiner, - determine if a matching fuzzy identifier does not exist in the database according to an absent criterion, and thereupon sending an absent signal to a database adding unit, - the database adding unit arranged to receive the absent signal, and upon said receiving, to add a database record to the database, said added database record storing the fuzzy input identifier, and further to send the matching signal to the fixed identifier determiner, and - the fixed identifier determiner arranged to receive the matching signal, and upon said receiving to determine a device fixed identifier from the database record storing the matching fuzzy identifier, wherein the device fixed identifier is assigned to the fuzzy identifier, wherein - a network interface arranged to receive a fuzzy input identifier, the fuzzy input identifier being a noisy response of a physically unclonable function, - a matching unit arranged to - determine if a matching fuzzy identifier exists in the database that matches the fuzzy input identifier according to a matching criterion, and thereupon sending a matching signal to a fixed identifier determining unit i.e. a fixed identifier determiner, - determine if a matching fuzzy identifier does not exist in the database according to an absent criterion, and thereupon sending an absent signal to a database adding unit, - determine if a matching fuzzy identifier exists in the database that matches the fuzzy input identifier according to a matching criterion, and thereupon sending a matching signal to a fixed identifier determining unit i.e. a fixed identifier determiner, - determine if a matching fuzzy identifier does not exist in the database according to an absent criterion, and thereupon sending an absent signal to a database adding unit, - the database adding unit arranged to receive the absent signal, and upon said receiving, to add a database record to the database, said added database record storing the fuzzy input identifier, and further to send the matching signal to the fixed identifier determiner, and - the fixed identifier determiner arranged to receive the matching signal, and upon said receiving to determine a device fixed identifier from the database record storing the matching fuzzy identifier, wherein the device fixed identifier is assigned to the fuzzy identifier, wherein - the network interface is arranged to transmit the device fixed identifier.