System for access authorization, wherein the system comprises a smartcard and an authorization client, -- wherein the smartcard comprises a substrate adapted to mechanically hold all units integrated in the smartcard, wherein the smartcard further comprises a transceiver unit adapted to transmit signals to the authorization client and to receive signals from the authorization client, a memory unit adapted to store first identification data, a display unit adapted to display an information related to second identification data received from the authorization client in case that the smartcard or a user of the smartcard is authorized, and a battery unit adapted to store electric power for all the units integrated in the smartcard, wherein the first identification data that are stored in the memory unit of the smartcard are only indicative of the identity of the user of the smartcard, wherein a complementary information with regard to the first identification data is required to determine the identity of the user of the smartcard, wherein upon the reception of information related to the first identification data, the complementary information is accessed by the authorization client and the second identification data sent to the smartcard, -- wherein the authorization client comprises a transceiver module adapted for communication with the smartcard by a connection in case that the smartcard is located in an authorization area, wherein the authorization client comprises a first module coupled to the transceiver module adapted for granting the access authorization for the smartcard and its user, and -- wherein the substrate of the smartcard is adapted to be only indicative of the identity of the user and/or of the issuer of the smartcard, wherein the smartcard is adapted such that the identity of the user and/or of the issuer of the smartcard is visible only after the information related to the second identification data being displayed on the display unit of the smartcard. -- wherein the smartcard comprises a substrate adapted to mechanically hold all units integrated in the smartcard, wherein the smartcard further comprises a transceiver unit adapted to transmit signals to the authorization client and to receive signals from the authorization client, a memory unit adapted to store first identification data, a display unit adapted to display an information related to second identification data received from the authorization client in case that the smartcard or a user of the smartcard is authorized, and a battery unit adapted to store electric power for all the units integrated in the smartcard, wherein the first identification data that are stored in the memory unit of the smartcard are only indicative of the identity of the user of the smartcard, wherein a complementary information with regard to the first identification data is required to determine the identity of the user of the smartcard, wherein upon the reception of information related to the first identification data, the complementary information is accessed by the authorization client and the second identification data sent to the smartcard, -- wherein the authorization client comprises a transceiver module adapted for communication with the smartcard by a connection in case that the smartcard is located in an authorization area, wherein the authorization client comprises a first module coupled to the transceiver module adapted for granting the access authorization for the smartcard and its user, and -- wherein the substrate of the smartcard is adapted to be only indicative of the identity of the user and/or of the issuer of the smartcard, wherein the smartcard is adapted such that the identity of the user and/or of the issuer of the smartcard is visible only after the information related to the second identification data being displayed on the display unit of the smartcard.