US 9,805,228 B2 · Proximity check for communication devices

Abstract

There is described a method of checking whether a transponder device (220) is in proximity of a reader device (210), the method comprising (a) transmitting a first command (331) from the reader device to the transponder device, (b) in response to receiving the first command at the transponder device, transmitting a first response (332) to the reader device, the first response including an expected transponder device response time (pubRespTime) which is stored in a memory (224) of the transponder device, (c) transmitting a second command (333) from the reader device to the transponder device, (d) in response to receiving the second command at the transponder device, transmitting a second response (334) to the reader device, (e) at the reader device, determining the transponder device response time as the difference in time between transmitting the second command and receiving the second response from the transponder device, and (f) determining whether the determined transponder device response time matches the expected transponder device response time included in the first response. There is also described a reader device (210), a transponder device (220), and a contactless communication system (200).

Claims16

Dependent claims

A method of checking whether a transponder device is in proximity of a reader device, the method comprising:

transmitting a first command from the reader device to the transponder device;
in response to receiving the first command at the transponder device, transmitting a first response to the reader device, the first response including an expected transponder device response time (pubRespTime);
determining an actual transponder device response time;
determining whether the determined actual transponder device response time fulfills a predetermined criterion relative to the expected transponder device response time included in the first response;
and
verifying a proximity check by comparing a message authentication code (MAC) calculated based at least on the expected transponder device response time with a received MAC.

3 more elements

A reader device for contactless communication with a transponder device, the reader device comprising:

an antenna;
a memory;
and
a processing unit, wherein the processing unit is configured to transmit a first command to the transponder device, receive a first response from the transponder device, the first response including an expected transponder device response (pubRespTime), determine an actual response time of the transponder device, determine whether the determined actual transponder device response time fulfills a predetermined criterion relative to the expected transponder device response time included in the first response, and verify a proximity check by comparing a message authentication code (MAC) calculated based at least on the expected transponder device response time with a received MAC.

1 more element

A transponder device for communication with a reader device, the transponder device comprising:

an antenna;
a memory;
and
a processing unit, wherein the processing unit is configured to receive a first command from the reader device, and transmit a first response to the reader device, the first response including an expected transponder device response time (pubRespTime), such that the reader device may check whether the transponder device is in proximity of the reader device by determining whether the actual transponder device response time fulfills a predetermined criterion relative to the expected transponder device response time included in the first response and verify a proximity check by comparing a message authentication code (MAC) calculated based at least on the expected transponder device response time with a received MAC.

1 more element

Dependencies are inferred from the claim text.

Proximity check for communication devices

Life of this patent

Proximity check for communication devices

Life of this patent

Abstract

Claims16