Kabushiki Kaisha Toshiba

Yuichi Komano

Atsushi Shimbo

Yoshikazu Hanatani

Shinji Yamanaka

Satoshi Ito

Taichi Isogai

Kenichiro Furuta

Hirofumi Muratani

Tomoko Yonemura

Kenji Ohkuma

Hideo Shimizu

Takeshi Kawabata

Hanae Ikeda

Toshinari Takahashi

Kazuo Ohta

Taku Kato

Toru Kambayashi

Koichi Fujisaki

Fangming Zhao

Tsukasa Endo

Shinichi Kawamura

Yoshihiro Oba

Yasuro Shobatake

Kentaro Umesawa

Tsukasa Omino

Mitsugu Iwamoto

Mikio Hashimoto

Hiroshi Isozaki

Yasuhiro Goto

Hideyuki Aisu

Koichiro Akiyama

Hideyuki Miyake

Tomoshi Otsuki

Naoki Ogura

Masatake Sakuma

Zhengfan Xia

Kazuo Sakiyama

According to an embodiment, a data generating device includes a first generator, an obtainer, a second generator, a verifier, and an operation selector. The first generator generates device-specific first data. The obtainer obtains second data from outside of the data generating device. The second generator generates third data based on the first data and the second data. The verifier verifies correctness of the third data. When the third data is determined to be incorrect, the operation selector selects at least one of regenerating the first data, re-obtaining the second data, and disabling the data generating device according to a predetermined selection rule.

Data generating device, communication device, mobile object, data generating method, and computer program product

According to an embodiment, an update control apparatus is to control update of software in a terminal connected to a network. The update control apparatus includes a first communication circuit, a second communication circuit, and a processor. The first communication circuit is configured to communicate with a server located outside the network. The second communication circuit is configured to communicate with the terminal through the network. The processor is configured to: receive update data to update the software from the server using the first communication circuit; transmit the update data to the terminal, as well as receive an update result indicating whether update of the software has succeeded, together with verification data, from the terminal using the second communication circuit; and verify, using the verification data, whether the update result is proper data.

Update control apparatus, software update system, and update control method

According to an embodiment, a test apparatus that is connected to an electronic device through a network includes a generator, a transmitter, and a determination unit. The generator generates third data computed from first data shared with the electronic device and predetermined second data. The transmitter transmits the third data to the electronic device. The determination unit determines whether the first data of the electronic device is normal depending on whether the second data is restored correctly from the third data using the first data of the electronic device.

Apparatus and method for testing normality of shared data

According to an embodiment, an information processing device includes a conversion unit, an encryption unit, and a transmission unit. The conversion unit converts a first encryption key to be used for generation of a master key to be shared with a server device by using a second conversion rule to generate a third encryption key to be a new master key. The second conversion rule is different from a first conversion rule used for generation of a second encryption key that is the master key currently used for encrypted communication with the server device. The encryption unit generates a ciphertext so that the server device derives the third encryption key on a basis of the second encryption key and the third encryption key. The transmission unit transmits the ciphertext to the server device.

Information processing device, server device, information processing system, moving object, and information processing method

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 data distribution apparatus is connected with electronic apparatuses through a network. The data distribution apparatus includes a storage, a transmitter, a receiver, and an output unit. The storage is configured to store management information in which predetermined data is associated with number specification information for specifying number of electronic apparatuses belonging to the group. The transmitter is configured to transmit a sharing start instruction including the predetermined data. The receiver is configured to receive one or more distribution requests transmitted from one or more electronic apparatuses in response to the instruction. The output unit is configured to output an error signal indicating that an unauthorized electronic apparatus is connected when the number of received distribution requests exceeds the number specified.

Data distribution apparatus, communication system, moving object, and data distribution method

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.

Concealing apparatus, decoding apparatus, concealing method, and decoding method

According to an embodiment, an information processing device is connected to a management apparatus via a network. The device includes a receiver, an acquisition unit, an MKB processor, and an authentication unit. The receiver is configured to receive communication information. The acquisition unit is configured to acquire a media key block from the management apparatus, in response to receipt of the communication information from a first external device not belonging to a group previously classified on a management unit basis by the management apparatus, the first external device and the information processing device being enabled to derive a first group key based on the media key block. The MKB processor is configured to generate the group key from a device key of the information processing device and the media key block. The authentication unit is configured to perform encrypted communication with the external device based on an authentication method using the group key.

Information processing device, management apparatus, information processing system, information processing method, and computer program product

According to an embodiment, an encryption key generating apparatus includes a converting unit to convert input data using a physically unclonable function and outputs output data; a memory to store a plurality of pattern data, each of which is a partial data in the output data indicated by one of a plurality of index data; a generating unit to generates an encryption key on the basis of the plural of index data; and a comparing unit to compare the output data with the plural of pattern data to detect plural of locations in the output data at which partial data similar to the plural of pattern data is present. The generating unit reproduces, as the plural of index data, the plural of locations detected by the comparing unit and reproduces the encryption key on the basis of the plural of index data that have been reproduced.

Encryption key generating apparatus and computer program product

According to an embodiment, a generating device includes a first key generator, a second key generator, an output unit, and an update unit. The first key generator is configured to generate a first key that is a sequence of bits according to a first key rule on the basis of a random number. The second key generator is configured to generate multiple second keys that are sequences of bits partially having correlation with one another according to a second key rule on the basis of the first key. The output unit is configured to output the first key and at least one of the second keys. The update unit is configured to generate update information for updating a second key by updating a partial sequence of the second key, the partial sequence having no correlation with the other second keys not to be updated.

Generating device, re-encrypting device, method, and computer program product

According to one embodiment, an information processing apparatus, which is connected to an external apparatus, includes a device key storage unit, a creating unit, a calculating unit, a communication unit, and a key calculating unit. The device key storage unit stores therein a device key. The creating unit creates a media key from the device key and a media key block. The calculating unit calculates first output information on the basis of first inherent information inherent to the information processing apparatus and public information. The communication unit transmits the first output information to the external apparatus and receives second output information calculated by the external apparatus from the external apparatus. The key calculating unit calculates a shared key shared between the information processing apparatus and the external apparatus on the basis of the media key, the first inherent information, and the second output information.

Information processing apparatus and program product

According to an embodiment, a partial information generating device includes a receiver, a first generator, and a second generator. The receiver is configured to receive power usage amounts each collected for a unitary time by at least one power meter. The first generator is configured to generate a piece of first partial information from a range that is zero or more and less than a predetermined basal value for each of the power usage amounts. The second generator is configured to generate one or more pieces of auxiliary information and a piece of second partial information for the each of the power usage amounts, by using the each of the power usage amounts, the piece of first partial information, and the basal value.

Partial information generating device, power usage amount calculation system, and partial information generating method

In a symmetric encryption apparatus according to an embodiment, a storage unit stores a symmetric key formed from a plurality of elements of a first polynomial ring. A plaintext acceptance unit accepts input of plaintext information. A plaintext polynomial generation unit generates a plaintext polynomial by embedding the plaintext information whose input has been accepted in at least one of terms of a polynomial in a subspace of the first polynomial ring. A mask polynomial generation unit generates a mask polynomial having the symmetric key as a solution based on a second commutative ring defined over the first polynomial ring. An encryption unit generates a ciphertext using the plaintext polynomial and the mask polynomial.

Symmetric encryption apparatus and storage medium, and symmetric decryption apparatus and storage medium

A measuring device has a consumption measurer to measure a consumption of at least one target equipment at every unit time within a predetermined measurement area, a consumption storage to store the measured consumption, a secret key storage to store a secret key shared with a key management device, an encryption key updater to update an encryption key at every predetermined period based on the secret key and time information, an encryption key storage to store the encryption key, an encryptor to generate encrypted data by encrypting the consumption using the encryption key stored in the encryption key storage, an encrypted data storage to store the encrypted data, and a communication controller to control transmission of the encrypted data, which is stored in the encrypted data storage, to a total consumption detecting device.

Measuring device, information processor, key management device, and consumption calculating system

According to an embodiment, an encryption device performs encryption processing using an encryption key and calculates encrypted data from plain data. The encryption device includes: a register; an input unit configured to receive plain data; a first partial encryption unit configured to calculate first intermediate data from the plain data; a second partial encryption unit configured to calculate (i+1)-th intermediate data based on i-th intermediate data and the encryption key; a first transform unit configured to: transform j-th intermediate data into j-th transformed data; and store the j-th transformed data in the register; and a second transform unit configured to transform the j-th transformed data into the j-th intermediate data; a third partial encryption unit configured to calculate encrypted data from the N-th intermediate data. The second partial encryption unit is configured to repeat processing to calculate (j+1)-th intermediate data while j is equal to from 1 to N&#x2212;1.

Growing community of inventors

Kanagawa, Japan

Yuichi Komano