Kabushiki Kaisha Toshiba

Akira Toshima

Akihiro Kasahara

Hideo Shimizu

Toru Kambayashi

Masao Suga

Takehisa Kato

Shingo Miyazaki

Akio Okazaki

Yasuhiko Suzuki

Sunao Wada

Naoki Endo

Kenichi Hiramatsu

Daigo Yoshii

Koichi Noguchi

Koji Mikami

Each embodiment of this invention implements step-by-step and empirical authentication of devices upon digital authentication among a plurality of devices. Each of a plurality of authentication devices of each embodiment can unidirectionally generate a hash value of a low experience rank from a hash value of a high experience rank, and receives a set of high experience rank and hash value in accordance with an experience. Upon receiving a certification request of the experience rank from another authentication device, the authentication device transmits a corresponding hash value to the authentication device as a request source. Upon sending a certification request of an experience rank to another authentication device, the authentication device verifies a hash value obtained from the other authentication device on the basis of a self hash value. In this way, the authentication devices authenticate each other's experience ranks.

System of authentication, apparatus, program and method

A thermal transfer type printing apparatus includes a thermal head constituted by a number of heating elements and is closely contacted with an ink ribbon. The thermal head is driven in accordance with print information to transfer the ink layer of the ink ribbon fed from an ink ribbon feeding reel to a paper. The negative formed on the ink ribbon due to the ink transferring is erased by the thermal head whose heating elements are driven while the ink ribbon is rewinded to an ink ribbon feeding reel.

Thermal transfer type printing apparatus

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Yokosuka, Japan

Akira Toshima