Invention Grant
- Patent Title: Multi-party secure authentication system, authentication server, intermediate server, multi-party secure authentication method, and program
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Application No.: US14910808Application Date: 2014-08-21
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Publication No.: US09992190B2Publication Date: 2018-06-05
- Inventor: Ryo Kikuchi , Dai Ikarashi , Koji Chida , Koki Hamada
- Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- Applicant Address: JP Chiyoda-ku
- Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- Current Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- Current Assignee Address: JP Chiyoda-ku
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2013-172032 20130822
- International Application: PCT/JP2014/071873 WO 20140821
- International Announcement: WO2015/025916 WO 20150226
- Main IPC: H04L29/06
- IPC: H04L29/06 ; H04L9/08 ; H04L9/32 ; G09C1/00
Abstract:
Even when an intermediate server exists, a plurality of servers simultaneously authenticates a user securely. A user apparatus disperses a password. The user apparatus obtains a ciphertext, which is obtained by encrypting a dispersed value. The intermediate server transmits the ciphertext to an authentication server. The authentication server decrypts the ciphertext to obtain the dispersed value. The authentication server determines a verification value. The authentication server obtains a ciphertext. The intermediate server decrypts the ciphertext to obtain the verification value. The intermediate server verifies whether a sum total of the verification values is equal to 0 or not. The authentication server determines a verification value. The authentication server obtains a ciphertext. The authentication server decrypts the ciphertext to obtain the verification value. The authentication server verifies whether a sum total of the verification values is equal to 0 or not.
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