Kabushiki Kaisha Toshiba

Toshiba Solutions Corporation

Nippon Steel Sumitomo Metal Corporation

Toho Titanium Co., Ltd.

Sony Corporation

Hitachi, Ltd.

East Japan Railway Company

Yoshihiro Fujii

Koji Okada

Minoru Nishizawa

Hidehisa Takamizawa

Tatsuro Ikeda

Tomoaki Morijiri

Asahiko Yamada

Takuya Yoshida

Tatsuyuki Matsushita

Ryotaro Hayashi

Takehisa Kato

Norikazu Hosaka

Minako Tada

Kazuhiro Takahashi

Masanobu Koike

Takashi Oda

Hisamune Tanaka

Kenichi Mori

Hideki Fujii

Takashi Yoshida

Shingo Abe

Tomonori Kunieda

Hironobu Yamakawa

Akitoshi Matsui

Masataka Yamada

Hiroaki Otsuka

Norio Yamamoto

Katsutoshi Kobayashi

Takeshi Shiraki

Kiyoshi Morita

Yoshimasa Miyazaki

Osamu Tada

Daisuke Akimaru

Hiroyuki Mayuzumi

Tomoyuki Shibuya

Yuki Kaseda

Masahisa Tajiri

Takayuki Namiki

Takahiro Masaki

Huyutaka Ishii

Toshihiko Mochida

Takahiro Chouno

According to one embodiment, there is provided an anonymization system including at least one encryption apparatus, an anonymization apparatus, and a decryption apparatus. The encryption apparatus store personal data including one or more values for each item, and generates encrypted data from the personal data by encrypting the one or more values for each item included in the personal data. The anonymization apparatus generates encrypted anonymized data from the encrypted data without decryption by anonymizing one or more values for at least a portion of the items of the encrypted data. The decryption apparatus generates anonymized data from the encrypted anonymized data by decrypting the encrypted anonymized data.

Anonymization system

A data management device according to an embodiment stores first encrypted data obtained by encrypting plain text data with a first public key of a first user device. The data management device stores a first re-encryption key for re-encrypting the first encrypted data without decrypting to obtain first re-encrypted data decryptable with a private key of a second user device. The data management device stores a conversion key generated from a first private key corresponding to the first public key and a second private key of the first user device. The data management device converts the first encrypted data into second encrypted data with the conversion key. The data management device The data management device converts the first re-encryption key into a second re-encryption key with the conversion key.

Data management device, system, re-encryption device, data sharing device, and storage medium

A titanium slab is appropriate for hot rolling, is produced by electron beam melting furnace, has superior linearity so that it can be fed into a hot rolling machine without performing breaking down process or other subsequent correcting process after production, and has good structure having no cracks at the corner parts. A process for production thereof is also provided. The titanium slab is directly produced by a mold of an electron beam melting furnace, and has the deformation of not more than 5 mm for the thickness direction versus the longitudinal direction and deformation of not more than 2.5 mm for the width direction versus the longitudinal direction, both per a length of 1000 mm of the slab. The process for production of this titanium slab for hot rolling has a step of using an electron beam melting furnace in which its rectangular mold has mold walls of a long side and mold walls of a short side, and a step of pouring molten metal from one of the mold walls of a short side. Furthermore, a mold having chamfered parts at the corner parts can be used in the process.

Titanium slab for hot rolling produced by electron-beam melting furnace, process for production thereof, and process for rolling titanium slab for hot rolling

A re-encryption key generator according to an embodiment generates a re-encryption key to obtain re-encrypted data that can be decrypted by a second private key of a second user device by re-encrypting ciphertext obtained by encrypting plaintext by a first public key of a first user device without decryption. The re-encryption key generator stores a first private key corresponding to the first public key. The re-encryption key generator stores a second re-encryption key generation key of the second user device that is different from a second public key corresponding to the second private key. The re-encryption key generator generates the re-encryption key based on the first private key and the second re-encryption key generation key.

Re-encryption key generator, re-encryption device, encryption device, decryption device, and program

Upon receiving ciphertext data transmitted by each service apparatus, a cooperation apparatus according to an embodiment generates re encrypted data by performing re encryption processing for the ciphertext data using are encryption key. Each of the service apparatuses transmits, to the cooperation apparatus, a request to acquire user information of a user specified by an identification (ID) indicated by the ciphertext data and stored in the other service apparatus, together with the ciphertext data. Upon receiving the re encrypted data transmitted by the cooperation apparatus, the service apparatus acquires an ID by decrypting the re encrypted data using a private key, reads out user information, and transmits the user information to the other service apparatus.

Cooperation service providing system and server apparatus

The present invention provides a titanium slab for hot rolling which can be fed into a general purpose hot-rolling mill for producing strip coil, without passage through a breakdown process such as blooming or a straightening process, and can further suppress surface defect occurrence of the hot-rolled strip coil, and a method of producing and a method of rolling the same, characterized in that in the cast titanium slab an angle &#x3b8; formed by the crystal growth direction (solidification direction) from the surface layer toward the interior and a direction parallel to the slab casting direction (longitudinal direction) is 45 to 90&#xb0;, and moreover, there is a surface layer structure of 10 mm or greater whose &#x3b8; is 70 to 90&#xb0;, and further characterized in that a crystal grain layer of 10 mm or greater is formed whose C-axis direction inclination of a titanium &#x3b1; phase is, as viewed from the side of the slab to be hot rolled, in the range of 35 to 90&#xb0; from the normal direction of the surface to be hot rolled. The titanium slab concerned is produced using an electron beam melting furnace by casting at an extraction rate of 1.0 cm/min or greater.

Titanium slab for hot rolling, and method of producing and method of rolling the same

In a decryption apparatus according to an embodiment, a holding device pre-holds a verification formula. A determination device performs a calculation based on the verification formula read from the holding device by substituting, into the verification formula, the part of the re-encrypted data received from a re-encryption apparatus and the public key of a re-encryption key generation apparatus and the private key of the decryption apparatus, to determine whether or not the verification formula holds true. An output device outputs verification success when a result of the determination indicates that the verification formula holds true.

Re-encrypted data verification program, re-encryption apparatus and re-encryption system

A re-encryption system according to this embodiment includes a file sharing apparatus and a re-encryption apparatus. Upon receiving a file request from the client apparatus, the file sharing apparatus acquires a first encrypted file based on the file request, and transmits a re-encryption request including the first encrypted file to the re-encryption apparatus. The re-encryption apparatus re-encrypts the first encrypted file included in the re-encryption request to the second encrypted file based on the re-encryption key, and transmits the second encrypted file to the file sharing apparatus. The file sharing apparatus transmits the second encrypted file to the client apparatus. The client apparatus obtains the file by decrypting the second encrypted file based on a private key corresponding to the public key of the member.

Re-encryption system, re-encryption apparatus, and program

A server apparatus according to an embodiment generates a random number on receiving from a user apparatus a notification showing that a re-encryption key should be updated, and calculates re-encryption key data on the basis of the re-encryption key stored and the random number generated. The server apparatus transmits the re-encryption key to the user apparatus and receives, from the user apparatus, the user private key not updated yet and re-encryption key updating data calculated from the re-encryption key data on the basis of the user private key updated. The server apparatus calculates the re-encryption key updated, on the basis of the re-encryption key updating data and the random number, and replaces the re-encryption key stored in the storage device with the updated re-encryption key.

Server apparatus and program to re-encrypt ciphertext data

An authentication device receives each authentication context including an output information block, an input information block, and an authenticator block. The output information block includes a process result and process result identification information. The input information block includes a process result and process result identification information. The authentication device verifies each authenticator block. The authentication device searches for the output information block having the same value of process result identification information as the value of process result identification information in the input information block from other authentication contexts based on process result identification information in the input information block included in each authentication context. The authentication device verifies whether or not the process result in the input information block is equal to the process result in the searched output information block, and authenticates that all the authentication contexts have validity when all the verification results are valid.

System and device for authentication

A re-encryption key generator according to an embodiment generates a re-encryption key required to re-encrypt, without decrypting, ciphertext data obtained by encrypting plaintext data by means of a first public key of a first user device to obtain re-encrypted text data which can be decrypted by a second private key of a second user device. The first storage device stores a first private key corresponding to the first public key. The second storage device stores a second public key corresponding to the second private key. The re-encryption key generation device generates the re-encryption key based on the first private key, the second public key, and the first random number.

Re-encryption key generator, re-encryption apparatus, and program

According to one embodiment, a master key management device generates, by using a first secret key stored in a first storage unit and a third public key, a re-encryption key used to re-encrypt a second secret key which is stored in a second storage unit and which is encrypted with a first public key to the second secret key encrypted with the third public key. A key management server device receives the generated re-encryption key from the master key management device while the master key management device and the key management server device are connected to each other, and stores the received re-encryption key in a third storage unit. The master key management device and the key management server device are disconnected after the re-encryption key is stored in the third storage unit.

Key management system

A client apparatus receives a message including a random number from a server apparatus during the handshake of agreement process, creates a biometric negotiation message including the biometric authentication method information and sends the biometric negotiation message to the server apparatus. Then, the client apparatus executes a biometric authentication based on biometric authentication method information notified from the server apparatus and encrypts the random number based on the private key. In addition, the client apparatus generates an authenticator from a result of the biometric authentication, the biometric authentication method information, the encrypted random number, and the client certificate, and sends to the server apparatus an authentication context including these. The server apparatus verifies the authentication context and establishes a secure session in one handshake.

Client apparatus, server apparatus, and program using entity authentication and biometric authentication

A configuration including, in authentication contexts, function unit identification information unique to the function unit that has executed an authentication subprocess in entity devices permits an authentication apparatus to specify the function unit that has executed the authentication subprocess in the entity devices. The verifier, therefore, can verify the legitimacy of the authentication subprocess from the authentication context even in the presence of a plurality of function units capable of executing the same authentication subprocess in the entity devices.

Authentication apparatus and entity device

A communication system including many communication terminals and a management apparatus, which includes: a section which processes user authentication, a first information management section for managing authenticated user information in association with terminal information about the communication terminal used by the user, a second information management section for managing communication information including the user information about many users with intent to communicate with one another, and a connection control section. If the second information management section manages the communication information including the authenticated user information and if the first information management section manages the another user information as part of the communication information, the connection control section sends the terminal information about another communication terminal corresponding to the other user information, to the communication terminal identified by the terminal information in association with the authenticated user information.

Communication system, communication system management apparatus, terminal connection control method, and program

Growing community of inventors

Fuchu, Japan

Yoshihiro Fujii