Defense against relay attack in passive keyless entry systems

US10427643B1 · kind B1 · utility

Assignee

• NXP B.V. · NL

Inventors

• Filippo Casamassima · Thal, AT
• Matja{hacek over (z)} Gu{hacek over (s)}tin · Graz, AT
• Wolfgang Eber · Zeltweg, AT

Key dates

• Filing date: Jul 13, 2018
• Grant date: Oct 1, 2019
• Expiry date: Jul 13, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C2209/63
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A system includes a first unit associated with an object and a second unit. The first unit includes a first transceiver coupled with first processing circuitry. The second unit includes a second transceiver coupled with second processing circuitry. Methodology includes establishing a bidirectional wireless communication link between the first and second units. Following establishment of the communication link, the first and second units exchange messages. The first processing circuitry measures a first received signal strength indicator (RSSI) value for each of the messages received at the first unit and sends the first RSSI value in a subsequent message to the second unit. The second processing circuitry measures a second RSSI value for each of the messages received at the second unit and sends the second RSSI value in another subsequent message to the first unit. A relay attack is determined in response to the first and second RSSI values.