Kabushiki Kaisha Toshiba

Mitsugu Iwamoto

Yuichi Komano

Kazuo Ohta

Tsukasa Omino

Tsukasa Endo

According to an embodiment, a generating device includes a first key generator, a second key generator, and an output unit. The first key generator is configured to generate a first key according to a first key rule in which the first key is generated from a random number, the first key being a bit sequence. The second key generator is configured to generate a plurality of second keys according to a second key rule in which the second keys are generated from the first key, the second keys being bit sequences partly correlated to one another. The output unit is configured to output the first key and at least one of the second keys.

Generating device, encryption device, decryption device, generating method, encryption method, decryption method, and computer program product

According to an embodiment, a concealing apparatus includes a concealing processor, a mapping information generator, a tag generator, and a concealed, information output unit. The concealing processor is configured to generate a concealed text by concealing a plaintext with a concealing key. The mapping information generator is configured to generate mapping information that is mapped to a keyword for retrieving the plaintext. The tag generator is configured to generate a tag based on the keyword and the mapping information. The concealed information output unit is configured to output the concealed text and the tag as a pair.

Growing community of inventors

Arakawa-ku, Japan

Mitsugu Iwamoto