A charging control system for controlling charging of an energy storage unit in a mobile entity being connected to a charging terminal of a charging entity, wherein at least one of the charging entity and the mobile entity comprises an investigating device and the other is an investigated entity being examined by the investigating device and has a signature, and wherein the charging control system comprises: at least one signature database (48, 50) and a charging control unit configured to receive, from the investigating device (17; 37), an indication that the mobile entity needs its energy storage unit to be charged, characterized in that the signature is an electric fingerprint reflecting an electronic consumption pattern of the mobile entity, and the charging control unit is further configured to fetch, from a signature database (48, 50), a group of reference signatures comprising at least one reference signature, wherein the group of reference signatures are provided as electric fingerprints each reflecting an electronic consumption pattern, receive, the signature of the investigated entity from the investigating device, compare, the received signature with said at least one reference signature and send, a result of the comparison to the investigating device, for allowing the entity comprising the investigating device to participate in the charging of the energy storage unit. at least one signature database (48, 50) and a charging control unit configured to receive, from the investigating device (17; 37), an indication that the mobile entity needs its energy storage unit to be charged, characterized in that the signature is an electric fingerprint reflecting an electronic consumption pattern of the mobile entity, and the charging control unit is further configured to fetch, from a signature database (48, 50), a group of reference signatures comprising at least one reference signature, wherein the group of reference signatures are provided as electric fingerprints each reflecting an electronic consumption pattern, receive, the signature of the investigated entity from the investigating device, compare, the received signature with said at least one reference signature and send, a result of the comparison to the investigating device, for allowing the entity comprising the investigating device to participate in the charging of the energy storage unit. receive, from the investigating device (17; 37), an indication that the mobile entity needs its energy storage unit to be charged, characterized in that the signature is an electric fingerprint reflecting an electronic consumption pattern of the mobile entity, and the charging control unit is further configured to fetch, from a signature database (48, 50), a group of reference signatures comprising at least one reference signature, wherein the group of reference signatures are provided as electric fingerprints each reflecting an electronic consumption pattern, receive, the signature of the investigated entity from the investigating device, compare, the received signature with said at least one reference signature and send, a result of the comparison to the investigating device, for allowing the entity comprising the investigating device to participate in the charging of the energy storage unit.