US Patent No. 10,925,111


Patent No. 10,925,111
Issue Date February 16, 2021
Title Ehf Secure Communication Device
Inventorship Gary Davis McCormack, Tigard, OR (US)
Ian A. Kyles, West Linn, OR (US)
Assignee Keyssa, Inc., Campbell, CA (US)

Claim of US Patent No. 10,925,111

1. A first device comprising:a communication interface unit comprising:
a transmitter unit configured to transmit first data using close proximity extremely high frequency (EHF) electromagnetic energy to a second device over a first transmission path;
a receiver unit configured to receive second data from the second device over a second transmission path; and
an interface control unit coupled to the transmitter unit and the receiver unit, the interface control unit configured to:
detect training information included in an EHF transmission received from the second device,
evaluate one or more attributes of the detected training information,
determine whether to establish a communication link for exchanging information in a transport mode over the first and the second transmission paths with the second device based on the evaluation,
calculate a round-trip propagation time between a first time when the first device transmits the training information to the second device and a second time when the first device receives the training information transmitted from the second device,
generate an encryption key based at least in part on the calculated round-trip propagation time, and
encrypt information exchanged in the transport mode between the first device and the second device using the encryption key.