Nippon Telegraph and Telephone Corporation

Nachi Ueno

Shingo Orihara

Yukio Tsuruoka

Kei Karasawa

Kenji Takahashi

At the user authentication apparatus, an identifier of a certification authority (CA) certificate that a CA information disclosure serverdiscloses in advance is registered in an identifier list of the CA. At the user terminal, a key pair consisting of a terminal public key and a terminal secret key is generated, the terminal signature is generated for information containing the terminal public key using the CA secret key acquired in advance, and a self-signed certificate of the same form as the certificate issued from CA, that is, a terminal certificate containing at least a terminal public key, a terminal signature, and a CA identifier, is created and stored, and registered in the user authentication apparatus. The terminal certificate having the same issuer information as the CA identifier in the identifier list of the CA notified from the user authentication apparatusat the time of the service request is selected, and user authentication in accordance with a well-known user authentication protocol is executed using the terminal certificate.

User authentication system and method for the same

A secret key of a second apparatus is stored in a relay apparatus. A first apparatus specifies secret information used to identify a common key, generates encrypted secret information by encrypting the secret information by using a public key of the second apparatus, and transmits the encrypted secret information to the relay apparatus. Then, the relay apparatus decrypts the encrypted secret information by using the secret key of the second apparatus to extract the secret information. The relay apparatus transmits the encrypted secret information to the second apparatus. The second apparatus decrypts the encrypted secret information by using the secret key of the second apparatus to extract the secret information. Finished messages corresponding to communication log information and the secret information are exchanged between the first apparatus and the relay apparatus and between the second apparatus and the relay apparatus.

Growing community of inventors

Tokyo, Japan

Nachi Ueno