Nippon Telegraph and Telephone Corporation

Mitsubishi Electric Corporation

Ntt Corporation

Tetsuya Okuda

Ryohei Suzuki

Koha Kinjo

Hiroyuki Kato

Kentaro Tsukamoto

Masahiro Ichikawa

Hanako Kondo

Koji Chida

Yuki Okano

Yoshinori Kanda

Taku Kondo

Koji Uchimura

Satoshi Akatsuka

Shinichi Kato

Ryo Kikuchi

Yoshinao Tatei

Kazuyoshi Watabu

Akiko Tabuchi

Takashi Aoki

Takashi Miyasaka

Yusuke Ueda

Yuichiro Dan

Satoshi Ohdaira

Takumi Aikawa

Misato Nakabayashi

Yo Takahashi

A program execution system including a data holding apparatus; a program providing apparatus; and a data processing apparatus that includes a mechanism for performing secret computing in a secure area is provided. The data holding apparatus transmits encrypted data of data D to the data processing apparatus, the program providing apparatus transmits an encrypted program of a program P to the data processing apparatus, the program providing apparatus transmits a secret key SKp to the data processing apparatus, the data processing apparatus generates a first signature by the secret key SKp on behalf of the program providing apparatus and transmits the first signature to the data holding apparatus, the data holding apparatus verifies the first signature and transmits a secret key SKd to the data processing apparatus, and the data processing apparatus computes, in the secure area, a result P(D) by executing the program P based on the data D.

Program execution system, data processing apparatus, program execution method, and program

A program execution system includes a data holding apparatus, a program providing apparatus, and a data processing apparatus that performs computing in a secure region. The data holding apparatus transmits encrypted data, encrypted with a first common key, to the data processing apparatus, and the program providing apparatus transmits an encrypted program, encrypted with a second common key, to the data processing apparatus. In the secure region, the data processing apparatus acquires data by decrypting the encrypted data with the first common key, acquires a program by decrypting the encrypted program with the second common key, executes the program for the data, and encrypts a result of the execution with a public key of the data holding apparatus or the first common key. The data holding apparatus acquires the result of the execution by decrypting the encrypted result of the execution with a secret key or the first common key.

Program execution system, data processing apparatus, program execution method and program

An information processing apparatus includes a secure area configured to execute a program in secret, and a security chip. The secure area conceals information related to the program, and requests the security chip to provide a blind signature with respect to the concealed information obtained by the concealing. The security chip calculates the blind signature and returns the blind signature to the secure area. The secure area acquires a signature with respect to the information related to the program from the blind signature.

Information processing apparatus, program execution system, information processing method and program

A certificate issuance support system includes a certificate application device in a first organization for applying to an authentication station for issuance of an OV certificate; and an existence assurance device in a second organization for guaranteeing the existence of the first organization. The existence assurance device imparts a first signature to first information for guaranteeing the existence of the first organization in response to a request from a terminal used by a member of the first organization, transmits the first information imparted with the first signature is to the certificate application device, and verifies a second signature generated by the certificate application device and imparted to second information for guaranteeing affiliation of the member with the authentication station. The certificate application device transmits the first information with the first signature and the second information with the second signature to the authentication station to receive the OV certificate.

Certificate issuance support system, certificate issuance support method and program

An information processing system includes a certification authority server, a web server, and a terminal. The certification authority server includes a processor, and a memory storing program instructions that cause the processor to receive an issuance request for a certificate transmitted from the web server, verify whether an operator of the web server has a right to use a trademark identified on the basis of information included in the issuance request, and transmit a certificate including the trademark to the web server when the operator has the right. The web server includes a processor, and a memory storing program instructions that cause the processor to transmit the certificate to the terminal in response to access from the terminal. The terminal includes a processor, and a memory storing program instructions that cause the processor to display the trademark included in the certificate. This improves reliability of the certificate including the trademark.

Information processing system, information processing method and program

Servo amplifier

A signature verification system includes a signature generation server, a signature verification server, and a verification key management server that are connected to one another via a communication network. The signature generation server includes: reporting means for, when a signing key and a verification key are generated by a publisher, reporting the verification key and publisher identification information that identifies the publisher to the verification key management server; and signature generation means for signing a bid request issued by the publisher with use of the signing key. The verification key management server includes: registration means for registering the publisher identification information and the verification key that were reported by the reporting means in a storage unit in association with information that enables specifying a version of the verification key.

Signature verification system, verification key management apparatus, verification key management method and program

A service providing system providing services to a plurality of users includes a transmitting unit configured to transmit, to a user terminal of each user, an authentication request requesting authentication for executing a predetermined process, a receiving unit configured to receive, from the user terminal of each user, an authentication response affixed with a user signature, and an executing unit configured to execute the predetermined process with respect to each user upon successful signature verification for all the plurality of users.

Service providing system, service providing device, service providing method, and service providing program

In a voting system including a vote broadcasting server and a plurality of client terminals, the vote broadcasting server generates a plurality of pieces of vote information that is data in which secret information is shared and transmits the vote information to each client terminal, each client terminal generates voting information by encrypting vote information such that the vote information can be decrypted when predetermined conditions are satisfied and transmits the voting information to the vote broadcasting server, the vote broadcasting server transmits a voting information group composed of voting information received from respective client terminals to the respective client terminals, and each client terminal ascertains a vote result according to the number of pieces of vote information decrypted from the voting information group and executes processing based on the vote result.

Voting system, vote relay server, client terminal, voting method, advertisement distribution system, and program

A communication system includes a transmitting device configured to transmit information, and a receiving device configured to receive the information, the receiving device includes a determination unit configured to determine whether or not an electronic certificate of the transmitting device used for a communication with the transmitting device is an EV certificate, and a process that is performed is varied according to a determination result of the determination unit.

Communication system, communication apparatus, communication method, program and advertisement communication system

When regenerative power from an AC motor via an inverter exceeds a predetermined power threshold, a charging/discharging control unit, which outputs a control signal for controlling the inverter on the basis of a DC bus voltage value and a charging/discharging current value, causes a power storage device to be charged such that the DC bus voltage value becomes a voltage threshold corresponding to the power threshold and causes a charging current at a start time of charging to the power storage device to start from a charging current value that is based on a DC bus voltage value.

AC motor drive system

An energy assist system selection supporting apparatus equipped with a step-up/step-down chopper unit, an electricity storage unit, and an electric motor configured to drive a machine includes an operation-pattern generating section for generating an operation pattern taking into account an electronic machine configuration, a load-pattern generating section for generating a load pattern concerning power consumption according to the generated operation pattern, a data processing section for evaluating, according to the generated load pattern, a characteristic of the energy assist system applied with the generated operation pattern while comparing the characteristic with a limit value and generate, according to an evaluation result, configuration information including the number of each unit of the energy assist system, and a layout section configured to lay out and arrange the units on a virtual space and display the units on a display screen according to the generated configuration information.

Energy assist system selection supporting apparatus, capacity selecting apparatus, power consumption calculating apparatus, and layout generating apparatus

Growing community of inventors

Tokyo, Japan

Tetsuya Okuda