US 11,728,972 B2
Methods and architectures for secure ranging
Yannick L. Sierra, San Francisco, CA (US); Zhimin Chen, San Jose, CA (US); and Thomas Icart, Paris (FR)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by APPLE INC., Cupertino, CA (US)
Filed on Jun. 24, 2022, as Appl. No. 17/848,922.
Application 17/848,922 is a continuation of application No. 16/643,237, granted, now 11,405,185, previously published as PCT/US2018/040701, filed on Jul. 3, 2018.
Claims priority of provisional application 62/564,947, filed on Sep. 28, 2017.
Prior Publication US 2022/0399994 A1, Dec. 15, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 9/08 (2006.01); G01S 13/76 (2006.01); H04L 9/40 (2022.01); H04W 12/03 (2021.01); H04W 12/041 (2021.01)
CPC H04L 9/0822 (2013.01) [G01S 13/765 (2013.01); H04L 63/1441 (2013.01); H04W 12/03 (2021.01); H04W 12/041 (2021.01); H04L 9/0872 (2013.01); H04L 63/0428 (2013.01); H04L 63/0492 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electronic device comprising:
a ranging module including one or more ranging sensors, the ranging module coupled to a secure processing system through a hardware interface, the ranging module configured to:
receive at least one encrypted ranging session key;
decrypt the at least one encrypted ranging session key to generate a ranging session key;
generate a sparse ranging input;
derive, using a cryptographic engine, a message session key based on the ranging session key; and
derive, using the cryptographic engine, a derived ranging key via a key derivation function applied to the message session key and the sparse ranging input, the derived ranging key configured to encrypt data transmitted during a ranging session.