US 12,335,253 B2
Terminal device, authentication server, authentication method, and non-transitory computer readable storage medium
Hidehito Gomi, Tokyo (JP)
Assigned to Yahoo Japan Corporation, Tokyo (JP)
Filed by Yahoo Japan Corporation, Tokyo (JP)
Filed on Mar. 7, 2022, as Appl. No. 17/688,681.
Claims priority of application No. 2021-084967 (JP), filed on May 19, 2021.
Prior Publication US 2022/0377063 A1, Nov. 24, 2022
Int. Cl. H04L 29/06 (2006.01); H04L 9/40 (2022.01)
CPC H04L 63/083 (2013.01) 14 Claims
OG exemplary drawing
 
1. A terminal device comprising:
a communication unit connected to a network; and
a processor, wherein the processor is configured to:
send a challenge to an authenticator;
receive the challenge with a signature and a public key from the authenticator;
perform signature verification using the public key;
directly provide a verification result of the signature to an authentication server via the communication unit;
receive a first challenge sent from the authentication server via the communication unit;
send a second challenge different from the first challenge to the authenticator;
receive a signature of the second challenge and a public key from the authenticator;
generate a signature of the first challenge when authentication is successful as a result of performing signature verification using the public key; and
return the signature of the first challenge to the authentication server via the communication unit as a response.