US 12,463,793 B2
Authentication system, authenticatee apparatus, authenticator apparatus, authentication method, and authentication program
Hiroto Tamiya, Tokyo (JP); Toshiyuki Isshiki, Tokyo (JP); Kengo Mori, Tokyo (JP); Haruna Fukuda, Tokyo (JP); and Masahiro Nara, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 18/685,575
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Aug. 31, 2021, PCT No. PCT/JP2021/031917
§ 371(c)(1), (2) Date Feb. 22, 2024,
PCT Pub. No. WO2023/032031, PCT Pub. Date Mar. 9, 2023.
Prior Publication US 2024/0356725 A1, Oct. 24, 2024
Int. Cl. H04L 9/06 (2006.01); H04L 9/08 (2006.01)
CPC H04L 9/0618 (2013.01) [H04L 9/0869 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An authentication system transmitting a ciphertext of authentication information from an authenticatee apparatus to an authenticator apparatus using homomorphic encryption with a public key encryption scheme, wherein
the authenticator apparatus issues a first random number to the authenticatee apparatus,
the authenticatee apparatus generates a second random number and transmits to the authenticator apparatus a first element generated with a public key using the first and the second random numbers and a second element generated with a public key using the second random number, and
the authenticator apparatus modifies the second element using the first random number to obtain a ciphertext of the authentication information.