US 12,250,538 B2
Encrypted nonces as rotated device addresses
Jerome Henry, Pittsboro, NC (US); Stephen Michael Orr, Wallkill, NY (US); and Robert E. Barton, Richmond (CA)
Assigned to CISCO TECHNOLOGY, INC., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Nov. 27, 2023, as Appl. No. 18/519,285.
Application 18/519,285 is a continuation of application No. 17/333,463, filed on May 28, 2021, granted, now 11,902,775.
Prior Publication US 2024/0089731 A1, Mar. 14, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 12/0431 (2021.01); H04W 12/03 (2021.01); H04W 12/06 (2021.01); H04W 12/73 (2021.01)
CPC H04W 12/0431 (2021.01) [H04W 12/03 (2021.01); H04W 12/06 (2013.01); H04W 12/73 (2021.01)] 20 Claims
OG exemplary drawing
 
8. An apparatus comprising:
a network interface configured to enable network communications;
one or more processors; and
one or more memories storing instructions that when executed configure the one or more processors to perform operations comprising:
exchanging, with a wireless client device over a secure communication channel, key information, a first nonce value, and a second nonce value;
receiving, from the wireless client device, a first rotation imminent message indicating that address rotation by the wireless client device is to occur within a time period from reception of the first rotation imminent message, the first rotation imminent message comprising a known source address of the wireless client device and the first nonce value;
following the first rotation imminent message, receiving a first data message comprising a first source address;
decrypting, based on the key information, a first encrypted value that is derived from the first source address to obtain a first decrypted value;
comparing the first decrypted value with the first nonce value; and
identifying that the first data message indicating the first source address originated from the wireless client device based on the comparing.