Kabushiki Kaisha Toshiba

Masato Shimano

Eiji Tokita

Go Fujino

Yoshiyuki Tsuzuki

Isao Takeyasu

Masaaki Miki

According to one embodiment, an apparatus includes a permission/inhibition information storage which stores a permission/inhibition information file, a changer which changes a first encryption key of a first private key encrypted with the first public key to the second public key by using the first re-encryption key, a first storage which stores a second private key in a device private key temporary storage, a second storage which stores a second re-encryption key in a re-encryption key storage, a permission/inhibition information registration module which registers second permission/inhibition information in the permission/inhibition information file, and a transmitter which transmits the second private key in the re-encryption key storage to the second terminal.

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Yokohama, Japan

Masato Shimano