An identification server for identifying a person to be identified, the identification server comprising: a memory for providing a plurality of personal data records which are assigned to different persons, wherein each personal data record comprises a biometric reference feature of a person transformed by means of a personalized transformation rule; a communication interface for receiving a person identifier and a service provider identifier via a communication network, wherein the person identifier is associated with the person to be identified and the service provider identifier is associated with a service provider; and a processor configured to read out from the memory an indication of the personalized transformation rule, which is assigned to the person to be identified and the service provider, based on the received person identifier and the service provider identifier; wherein the communication interface is configured to send out a request for the transmission of a biometric feature of the person to be identified, transformed by means of the personalized transformation rule assigned to the service provider, via the communication network, wherein the request comprises the indication of the personalized transformation rule and an indication of the service provider, wherein the communication interface is further configured to receive the transformed biometric feature of the person to be identified via the communication network; and wherein the processor is configured to compare the received transformed biometric feature with the transformed biometric reference feature which is assigned to the person and the service provider in order to identify the person to be identified in relation to the service provider. a memory for providing a plurality of personal data records which are assigned to different persons, wherein each personal data record comprises a biometric reference feature of a person transformed by means of a personalized transformation rule; a communication interface for receiving a person identifier and a service provider identifier via a communication network, wherein the person identifier is associated with the person to be identified and the service provider identifier is associated with a service provider; and a processor configured to read out from the memory an indication of the personalized transformation rule, which is assigned to the person to be identified and the service provider, based on the received person identifier and the service provider identifier; wherein the communication interface is configured to send out a request for the transmission of a biometric feature of the person to be identified, transformed by means of the personalized transformation rule assigned to the service provider, via the communication network, wherein the request comprises the indication of the personalized transformation rule and an indication of the service provider, wherein the communication interface is further configured to receive the transformed biometric feature of the person to be identified via the communication network; and wherein the processor is configured to compare the received transformed biometric feature with the transformed biometric reference feature which is assigned to the person and the service provider in order to identify the person to be identified in relation to the service provider.