Kabushiki Kaisha Toshiba

Yasuhiro Fujiyoshi

Yoshimichi Tanizawa

Kenji Shimoda

Hiroshi Isozaki

Yasuhiro Katsube

Jun Kanai

Seijiro Yasuki

Ririka Takahashi

Noriya Sakamoto

Tatsuya Uehara

Yoshihisa Sakazaki

Takayasu Tsuchiuchi

Yu Yu

Shinichiro Nakano

Jun Kano

A key management device according to an embodiment is a key management device managing an application key for encrypting a communication in an application network including a plurality of applications. The key management device includes a hardware processor configured to function as a collection unit, a calculation unit, a determination unit, and a communication unit. The collection unit collects, using quantum key distribution (QKD), resource information indicating a resource of a link for which a link key is generated. The calculation unit calculates metric for a key relay route including the link on the basis of the resource information. The determination unit determines a key relay route from among a plurality of key relay routes on the basis of the metric. The communication unit uses the key relay route determined by the determination unit to send, to a destination, an application key encrypted with the link key.

Key management device, quantum cryptography communication system, and computer program product

According to an embodiment, a quantum cryptography storage system includes a plurality of storage, a distribution control device, and a distribution device. The plurality of storage devices are connected via a communication network. The distribution control device determines a distribution mode of shares into which data is distributed, based on quantum key distribution network (QKDN) information. The generation device generates an encryption key and a decryption key by using a quantum key shared by using a QKDN. The distribution device distributes the data into the shares, based on the distribution mode. When receiving a share encrypted using the encryption key via the communication network, each of the plurality of storage devices that stores the shares in a distributed manner decrypts the share encrypted with the decryption key and stores a share decrypted.

Quantum cryptography storage system, distribution control device, and computer program product

According to an embodiment, a tuner unit, a managing unit, a private code verifying unit, an application origin verifying unit, and a device operation command processing unit. The tuner unit is configured to perform a decoding process of a broadcast program and program related information from broadcasting waves. The managing unit is configured to store a private code on a device-by-device basis. The private code verifying unit is configured to verify whether the private code obtained from an information manipulation device matches with the stored private code. The application origin verifying unit is configured to determine whether first origin information that has been received matches with second origin information of the application being executed. The device operation command processing unit is configured to allow execution of the device operation command when the first origin information and the second origin information match and when the private codes match.

Information output device, information manipulation device, and computer program product

According to one embodiment, a content playback device includes a receiving module which receives a plurality of channels including content, a selection module which selects a desired channel from a plurality of channels, a playback module which plays back a content item included in the selected channel, and a creation module which creates a special clock based on a playback time of a content item for the selected channel.

Content playback device and content playback method

An intelligent digital television receiver for receiving a video signal, an audio signal and a digital data transmitted in a digital broadcast, and for executing an application based on the received digital data by itself or in connection with the received video and/or audio signal. The receiver has a controller for controlling executions of applications by generating events according to event start information bearing time information contained in a digital data stream as an object which comprises an element of the application and another controller for controlling executions of the application.

Intelligent digital television receiver

Growing community of inventors

Tokorozawa, Japan

Yasuhiro Fujiyoshi