Method of detecting a redirection or relaying of a contactless data transmission using at least two sequentially driven transmitting antennas
US6970679B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2002 |
| Grant date | Nov 29, 2005 |
| Priority date | — |
| Expiry date | May 28, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00793
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method detects relaying of a contactless data communication by a radio amplifier for intercepting and manipulating the communication to achieve an unauthorized authentication. The method involves transmitting an electromagnetic field successively from at least two spatially separated antennas of a transmitting unit, receiving the transmitted fields in a receiving unit, determining field strength vectors of the received fields allocated to each antenna, and comparing actual values of the vectors with prescribed nominal values stored in a nominal value field that maps the true field strength distribution in multi-dimensional space around the transmitting unit. The actual field strength magnitude and the reception angle between the transmitting antennas can be determined from the vectors and compared with stored nominal values in this manner. When the determined actual values match prescribed nominal values of the nominal value field, the occurrence of a relaying of the signal can be reliably excluded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.