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:
Sep. 23, 2025
Filed:
Jul. 21, 2023
Isara Corporation, Waterloo, CA;
Atsushi Yamada, Waterloo, CA;
ISARA Corporation, Waterloo, CA;
Abstract
In a general aspect, a cryptography system includes a multiple-key-pair root certificate authority. In some aspects, an inquiry regarding the validity of an identified root certificate of a root certificate authority (CA) is received from an entity. The validity of the identified root certificate is cryptographically verified against a cryptographically authenticated database representing the root CA. The cryptographically authenticated database includes a plurality of distinct root certificates of the root CA, which includes the identified root certificate. The cryptographically authenticated database also includes validity information representing validity or invalidity of each of the plurality of distinct root certificates. A determination is provided to the entity regarding the validity of the identified root certificate.