Nippon Telegraph and Telephone Corporation

Yusuke Hisada

Satoshi Ono

Yukio Tsuruoka

Haruhisa Ichikawa

An address notification device is provided with: a link information list storage partfor storing link information list composed of link information including an own address, an address of a communicating party, and process information about processing of communication information to be communicated between the own address and the communicating party address; a change information registration partfor adding the link information selected by a link information select partwith change information representing the content of the change; a link change information sending partfor sending link change information representing a change of the link information to a destination indicated by the communicating party address contained in the link information added with the change information; and a link information change partfor changing the link information on the basis of the change information added thereto in response to response information sent from the communicating party in response to the sending thereto of the link change information.

Address notifying apparatus and address notifying method

A mediating apparatus is provided on an IP network, and stores an access control list (ACL) retained in a VPN gateway unit. The mediating apparatus: receives a retrieval request from a VPN client unit; acquires a private IP address of a communication unit by reference to ACL; searches DNS to acquire therefrom an IP address of the VPN gateway unit; generates a common key that is used for authentication between the VPN client unit and the VPN gateway unit and for encrypted communication therebetween; sends the IP address of the VPN gateway unit, the private IP address of the communication unit, and the common key to the VPN client unit; and sends the IP address of the VPN client unit and the common key to the VPN gateway unit.

Remote access VPN mediation method and mediation device

An email access control scheme capable of resolving problems of the real email address and enabling a unique identification of the identity of the user while concealing the user identification is disclosed. A personalized access ticket containing a sender's identification and a recipient's identification in correspondence is to be presented by a sender who wishes to send an email to a recipient so as to specify the recipient as an intended destination of the email. Then, accesses between the sender and the recipient by verifying an access right of the sender with respect to the recipient according to the personalized access ticket at a secure communication service. Also, an official identification of each user by which each user is uniquely identifiable by a certification authority, and an anonymous identification of each user containing at least one fragment of the official identification are defined, and each user is identified by the anonymous identification of each user in communications for emails on a communication network.

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Saitama, Japan

Yusuke Hisada