The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2025
Filed:
Sep. 24, 2021
John A. Nix, Evanston, IL (US);
John A. Nix, Evanston, IL (US);
Abstract
A server and a device can conduct a secure session with (i) multiple post-quantum cryptography (PQC) key encapsulation mechanisms (KEM) and (ii) forward secrecy. The device can store a server static public key (PK.server) before establishing a secure session with the server. The device can use PK.server to encrypt a device ephemeral public key (ePK.device) into a first ciphertext. The first ciphertext can also include a device digital signature. The server can receive and decrypt the first ciphertext. The server can use the ePK.device to encrypt a server ephemeral public key (ePK.server) into a second ciphertext. The second ciphertext can also include a server digital signature. The device can receive and decrypt the second ciphertext. The device can encrypt application data into a third ciphertext using both PK.server and ePK.server. PK.server can support a first PQC algorithm and ePK.server can support a different, second PQC algorithm.