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:
Jun. 03, 2025
Filed:
May. 20, 2020
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Masaru Matsubayashi, Tokyo, JP;
Takuma Koyama, Tokyo, JP;
Yasushi Okano, Tokyo, JP;
Masashi Tanaka, Tokyo, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
An authentication apparatus that performs authentication of a client terminal by challenge-response authentication, the authentication apparatus includes one or more computers each including a memory and a processor configured to: receive a challenge request from the client terminal; generate a challenge as to the challenge request; and transmit the challenge to the client terminal. The memory and the processor are configured to generate the challenge by one generating method out of a fixed generating method in which a challenge of a fixed value is generated, and a random generating method in which a challenge of a random value is generated, in accordance with a state of the authentication apparatus.