| 摘要 |
The systems, methods and apparatuses described herein provide an apparatus configured for ensuring proximity of a communication partner. In one aspect, the apparatus may comprise a communication port and a processor. The processor may be configured to send a request to and receive a response from the communication partner via the communication port using modulated signals, measure a time period between sending and receiving using timings of modulated signals' symbols, and receive a secondary value from the communication partner. The secondary value may be verified to include at least a portion of the request and a portion of the response, and may have been sent with authenticating data to authenticate it. The time period may be compared with a predefined threshold calculated based on a predefined maximum allowed distance to the communication partner. In another aspect, an apparatus may be configured to ensure its proximity to a communication partner. |
