Patent ID: 8850198

Claim:
A method for validating a road traffic control transaction that is sent from a control station of a road traffic control system to a transaction receiver of the road traffic control system, the method comprising: storing a cryptographic key assigned to the transaction receiver, in the transaction receiver and in a separate processing element of the control station; recording an image of a vehicle, reading an identification of the vehicle in the recorded image by OCR and generating a control transaction thereof in the control station; generating a random key and encrypting the recorded image into authentication data with the random key and the cryptographic key in the separate processing element of the control station; transmitting the recorded image, the control transaction, the random key and the authentication data to the transaction receiver; in the transaction receiver, receiving the recorded image, the control transaction, the random key, and the authentications data, and encrypting the received recorded image into nominal authentication data with the received random key and the stored cryptographic key; and comparing the received authentication data with the nominal authentication data, wherein the received control transaction is validated when the received authentication data and the nominal authentication data are identical.