Method and apparatus to secure a system for passive unlocking of a vehicle system against relay station attacks

US10308220B2 · kind B2 · utility

Assignee

• Ford Global Technologies, LLC · US

Inventors

• Holger Mueller · Möhrendorf, DE
• Andreas Springer · Beckum, DE
• Uwe Zank · Pulheim, DE

Key dates

• Filing date: Dec 22, 2017
• Grant date: Jun 4, 2019
• Expiry date: Dec 22, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C2009/00555
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The disclosure relates to a method and an apparatus to secure a system for passive unlocking of a vehicle system, particularly a vehicle unlocking system, against relay station attacks. The system comprises a vehicle-based device that can send on a first radio frequency and receive on a second radio frequency, and a driver-based device that can receive on the first radio frequency and send on the second radio frequency. The vehicle-based device and/or the driver-based device are also able to receive on a radio frequency that the other device can receive. One of the two devices send at least one ambient noise signal sequence to the other device. The ambient noise signal sequences received by both are compared with one another with cross-correlation. A current situation is deemed safe if the cross-correlation is strong and a phase shift is small.