US 12,355,871 B2
Pairwise key establishment between two measurement states
Joona Verneri Kannisto, Salo (FI); and Aseem Brahma, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Mar. 30, 2023, as Appl. No. 18/193,582.
Prior Publication US 2024/0333488 A1, Oct. 3, 2024
Int. Cl. H04L 9/08 (2006.01)
CPC H04L 9/0861 (2013.01) [H04L 9/0894 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A method for key establishment, the method comprising:
during a first cryptographic key derivation:
storing a first trusted measurement value associated with a first entity in a first secure storage location;
storing an expected measurement value associated with a second entity in a second secure storage location; and
generating a first instance of a cryptographic key using the first trusted measurement value, the expected measurement value, and a key derivation function; and
during a second cryptographic key derivation:
obtaining, after generating the first instance of the cryptographic key during the first cryptographic key derivation, the expected measurement value as a second trusted measurement value associated with the second entity;
storing the second trusted measurement value in the second secure storage location;
obtaining the first trusted measurement value as a second expected measurement value;
storing the second expected measurement value in the first secure storage location; and
generating a second instance of the cryptographic key using the second expected measurement value, the second trusted measurement value, and the key derivation function.