US 12,445,835 B2
Secret key extraction for line-of-sight communications
Ahmed Elshafie, San Diego, CA (US); Abdelrahman Mohamed Ahmed Mohamed Ibrahim, San Diego, CA (US); and Muhammad Sayed Khairy Abdelghaffar, San Jose, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Dec. 1, 2021, as Appl. No. 17/540,136.
Prior Publication US 2023/0171595 A1, Jun. 1, 2023
Int. Cl. H04W 12/041 (2021.01); H04L 9/40 (2022.01); H04W 12/65 (2021.01); H04W 12/79 (2021.01)
CPC H04W 12/041 (2021.01) [H04L 63/18 (2013.01); H04W 12/65 (2021.01); H04W 12/79 (2021.01)] 28 Claims
OG exemplary drawing
 
28. A method for wireless communication at a second device, comprising:
transmitting, to a first device, a secured control message that indicates both a configuration of a set of reference signals and a quantity of line-of-sight communication modes included in a set of line-of-sight communication modes, wherein each line-of-sight communication mode corresponds to a different phase offset between antenna elements of a uniform circular array used for orbital angular momentum (OAM) communications;
transmitting, to the first device, the set of reference signals using the set of line-of-sight communication modes based at least in part on the secured control message;
obtaining a key based at least in part on the set of line-of-sight communication modes;
generating a secret key used for encrypting one or more messages communicated between the second device and the first device, the secret key being different from the key and generated based at least in part on the key and the set of line-of-sight communication modes;
and communicating signaling with the first device using line-of-sight communications, the signaling comprising the one or more messages that are encrypted with the secret key.