Hitachi, Ltd.

Hisashi Umeki

Susumu Matsui

Mototsugu Nishioka

Tadashi Kaji

Seiichi Susaki

Katsuyuki Umezawa

Satoshi Kai

Makoto Kitagawa

Satoshi Takemoto

Seiji Miyazaki

Tomohiro Shigemoto

Hirofumi Nakakoji

Kazuo Matsunaga

Tetsuro Kito

A vulnerability countermeasure device stores configuration information associating multiple computers connected via a network and software possessed by each computer, vulnerability information associating the software with information related to the vulnerability of the software, and countermeasure policy information associating the software with a countermeasure policy to be executed if there is a vulnerability in the software; calculates the computer that data will reach based on information related to a route of the data included in the data received from a used terminal; acquires software existing in the computer based on the calculated computer and configuration information; assesses whether or not there is a vulnerability in the acquired software based on the acquired software and the vulnerability information; and is provided with countermeasure unit for executing a countermeasure to a vulnerability in accordance with a countermeasure policy with respect to the software assessed to have the vulnerability.

Vulnerability countermeasure device and vulnerability countermeasure method

A key distribution method and system are disclosed in which a sender and receivers share a common key information for performing a secure broadcast communication. By use of a center side apparatus, a center generates key information of a receiver in association with a subset inclusive of two or more elements of a proper finite set S1 on the basis of a space determined by a subset inclusive of two or more elements of another finite set S2. A sender side apparatus, a sender makes the multi-address transmission of key distribution data W inclusive of data generated corresponding to each element of the finite set S1 and data generated corresponding to a set of plural receivers through a communication network. By use of a receiver side apparatus, a receiver generates common key information between the sender and the receiver from the key distribution data W and the key information of the receiver.

Key distribution method and system in secure broadcast communication

A client-server system is provided in which access to a service by a user can properly be controlled, even if an approval by another user is required for receiving the service. First, the server,executes a log-in processing by using a user identifier and password transmitted from the client terminal,, and a user control file,. Next, the server,executes a service control by using a service supply request transmitted from the client terminal,and a service control file,provided with the server. When the server determines that an approval by another user is required for providing the service, the server executes the approval request to the client terminal,that the concerned user uses. When the reply to the approval request is affirmative, the server executes the processing in accordance with the foregoing service supply request. When the reply is negative, the server informs to the user who made the foregoing service supply request that the approval is rejected.

Client-server system for controlling access rights to certain services by a user of a client terminal

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Tokyo, Japan

Hisashi Umeki