Vehicular implementations of public key cryptographic techniques

The author discusses public key cryptography techniques offering solutions to the unique problems associated with transaction authentication procedures using the open communication channel between a vehicle and an unprotected ground terminal. Valuable secrets embedded in costly security modules are not kept at the terminals. Playback of recorded taped communications or attempts at rehashing messages would be useless, and will not assist illicit falsification or forging of subsequent transactions. To prevent the unauthorized use of the crediting facility of a vehicle, an integral part of this facility is to be carried by the driver when the vehicle is not in operation. This can be integrated into existing electronic ignition keys. A public key cryptographic module installed in a vehicle can also be used for theft prevention by enhancing both ignition security and remote controlled door locking/unlocking mechanisms. The same device can be used for authenticating smartcard-based prepayment systems for parking or toll-road usage. This methodology is described