Hitachi, Ltd.

Yokohama National University

Fujitsu Corporation

Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Sumitomo Electric Industries, Limited

Nippon Telegraph and Telephone Corporation

Victor Company of Japan, Limited

Amano Corporation

Toshiba Energy Systems & Solutions Corporation

National University Corporation Yokohama National University

Tsutomu Matsumoto

Ryoichi Sasaki

Kunihiko Miyazaki

Seiichi Susaki

Mitsuru Iwamura

Kazuo Takaragi

Takeshi Matsuki

Hiroshi Yoshiura

Hisashi Oguma

Toshiyuki Moritsu

Mizuhiro Sakai

Koichi Suzuki

Takayuki Hasebe

Naoya Torii

Hiroki Ueda

Kazuomi Oishi

Jun Yajima

Yoshikazu Isoyama

Youichi Takashima

Yoichi Hata

Masayuki Kanda

Kazuo Ohta

Kazumaro Aoki

Katsuhiko Sekiguchi

Tadahiro Sato

Hisashi Toyoshima

Tomokazu Moriya

Kenichi Shimomai

Hirokazu Aoshima

Shigeki Katayama

Hideo Noyama

Takayuki Deno

Masato Tanabe

Takeshi Kamata

Hideki Gotoh

Kazuto Fukushima

Toyohito Asanuma

Kunihito Takeuchi

Hiroki Mitsumoto

Fumitaka Tsuji

Kenji Yoichizono

Katsunari Yoshioka

Hiroshi Asami

Hisanori Mishima

Tsuyoshi Toyama

Keisuke Ichikawa

Yosuke Maekawa

Camille Gay

Masato Hata

A device includes a first interface unit connected to a first controller area network (CAN) bus, a second interface unit connected to a second CAN bus, and a control unit configured to identify, in a case where transmission of a CAN frame is started, a CAN bus detected to be in a dominant state first after end of arbitration from the first CAN bus or the second CAN bus, as a CAN bus to which a transmission source device of the CAN frame is connected.

Device and method

A connector system is provided with a first connector including a first transmission line, and a second connector including a second transmission line. The second connector includes a processing unit configured to perform an information transmission process of creating information regarding verification, and transmitting the information to the first connector. The first connector includes: a switch configured to, in a state where the first connector and the second connector are connected to each other, select whether or not to electrically connect the first transmission line and the second transmission line to each other; a verification unit configured to perform a verification process of verifying the second connector, based on the information received from the second connector; and a control unit configured to control the switch, based on a result of the verification process.

Connector system, connector, and connection method

Disclosed is a system for detecting an attack, which includes a server and a plurality of vehicles capable of wirelessly communicating with each other. Each of the vehicles has a sensor, a sensor information acquisition unit, a traffic information reception unit, and a transmission unit that transmits the sensor information and the traffic information to the server. The server has a reception unit that receives the sensor information and the traffic information from the vehicles, a verification unit that verifies whether the sensor information and the traffic information are inconsistent with each other, and a notification unit that notifies, when the sensor information and the traffic information are inconsistent with each other, the vehicles of the inconsistency.

System and method for detecting attack when sensor and traffic information are inconsistent

A communication system includes a first communication device that determines, using identification information on a frame, whether to receive the frame, and a second communication device that belongs to a network identical to the first communication device. A report frame includes a detection of an attack on the network and target identification information that is identification information included in a frame used to perform the attack. When the first communication device receives a report frame from the second communication device, the first communication device sets the frame including the target identification information to be an authentication processing target. Upon transmitting a transmission frame set to be the authentication processing target, the first communication device transmits authentication information generated from the transmission frame along with the transmission frame.

Communication system, communication method, and communication device

Each of ECUs counts the number of messages transmitted for each of CAN IDs. A transmission node that has transmitted a main message produces an MAC from a data field and the CAN ID in the main message and a counter value corresponding to the CAN ID, and transmits the MAC as an MAC message. A reception node that has received the main message produces an MAC from the data field and the CAN ID contained in the main message and the counter value corresponding to the CAN ID, and determines whether the MAC matches the MAC contained in the MAC message. By so doing, verification whether the main message is valid or not can be made. According to this configuration, message authentication by the MAC can be made without changing a CAN protocol.

Message authentication method in communication system and communication system

According to one embodiment, when sending a transmission target main data, an authentication-tag generator unitgenerates an authentication tagby using a main dataand a key datastored in a key-data storage unit. A transmitter/receiver unitadds the authentication tagto the main datasends as a transmission data. When receiving the received data, the transmitter/receiver unitdivides the received data into a main dataand an authentication tag. The authentication-tag generator unitgenerates an authentication tagfor comparison. A received-data authentication unitdetermines whether or not those the received authentication tagand the authentication tag for comparisonmatch with each other. A different key data is used every time upon the authentication-tag generation and use time of each key data during a set period is restricted.

Protective-control measuring system and device and data transmission method

According to the invention, techniques for authenticating that a digitally signed document is genuine. Specific embodiments according to the present invention can determine whether a digital signature was generated by a digital signature generator, or if the digital signature was generated by a third party posing as the digital signature generator. Specific embodiments can provide independent verification of digital signer identity based upon prior signed messages, time/date stamps, and the like. Techniques according to the present invention can be embodied in methods, apparatus, computer software and systems.

Digital signing method

An electronic document authenticity assurance technique and an information disclosure system both of which can compatibly realize the assurance of the authenticity of disclosure documents and the deletion of information inappropriate for disclosure. An electronic document is divided into constituent elements and an electronic signature is affixed to an arbitrary subset of a set including all the constituent elements. Otherwise, an electronic signature is affixed to data obtained by binding each of the constituent elements to information specifying the relationship between a respective one of the constituent elements and the structure of the electronic document. Otherwise, the hash values of the respective constituent elements are calculated and an electronic signature is affixed to data obtained by binding the calculated hash values together. Otherwise, random numbers generated for the respective constituent elements are bound together, then the hash values of the respective random-numbered constituent elements are calculated, and then an electronic signature is affixed to data obtained by binding the calculated hash values together.

Electronic document authenticity assurance method and electronic document disclosure system

A card settlement method using a mobile information terminal provided with an IC card read/write function and a wireless communication function for the settlement of a transaction in a business establishment, comprising a step of having a customer using a business establishment wirelessly connect to an authorization server through a network by the mobile information terminal, a step of having the customer load his or her IC card in the mobile information terminal, read the information stored in this IC card, and send it to the authorization server, a step of having the authorization server decide on the authorization of the current transaction from authentication information stored in the IC card and proving the legitimacy of the card, settlement information containing at least a card number, and personal identification information input from the customer and proving the legitimacy of the customer, a step of sending a temporary password issued from a settlement server to the mobile information terminal for display after the authorization of the current transaction, a step of inputting the temporary password and the current transaction information from a business establishment side settlement terminal and sending it to the settlement server, and a step of having the settlement server settle the transaction with the password and the transaction information satisfying the settlement conditions.

Card settlement method and system using mobile information terminal

A time stamping system for electronic documents has a document preparation device and a time stamp issuing server. The document preparation device includes an electronic document reading device that reads an electronic document. A digest value computer computes a digest value based on the read document. A transmitter transmits the computed digest value to the time stamp server with a request for a time stamp. A receiver receives the requested time stamp from the time stamp server and an electronic writer writes the received time stamp into the electronic document.

Time stamping system for electronic documents and program medium for the same

A time stamp generating system has a time distribution server for generating time data depending on time and a user PC for holding time certification objective digital data. The time distribution server generates time data corresponding to a time point and distributes the time data. The user PC calculates time stamp generating data by using the time certification objective data as an input, acquires the time data generated by the time distribution server, and processes the time data on the basis of the time stamp generating data to obtain a time stamp.

Time stamp generating system

When an LPP (land pre-pit) is formed between shallow grooves or shallow pits, the LPP is formed on a land existing between the shallow grooves or the shallow pits. Further, the LPP is formed in a position displaced from a centerline of the land in the radial direction by a predetermined amount. Furthermore, a laser beam power utilized for forming a shallow groove or a shallow pit adjacent to the LPP is reduced so as to be lower than a regular laser beam power.

Optical disc having land pre-pits and variable groove depths

Digital signature generating method and digital signature verifying method

A plurality of round processing parts ( ) are provided each of which contains a nonlinear function part ( ), and each nonlinear function part ( ) comprises: a first key-dependent linear transformation part ( ) which performs a linear transformation based on a subkey; a splitting part ( ) which splits the output from the first key-dependent linear transformation part into n pieces of subdata; a first nonlinear transformation part ( ) which nonlinearly transforms those pieces of subdata, respectively; a second key-dependent linear transformation part ( ) which linearly transforms those nonlinearly transformed outputs based on a subkey and outputs n pieces of transformed subdata; a second nonlinear transformation part ( ) which nonlinearly transforms those transformed subdata; and a combining part ( ) which combines the nonlinearly transformed outputs. An n&times;n matrix, which represents the linear transformation in the second key-dependent linear transformation part ( ), is formed by n vectors whose Hamming weights are equal to or larger than T&minus;1 for a security threshold T, thereby increasing the invulnerability against differential cryptanalysis and linear cryptanalysis.

Data converter and recording medium on which program for executing data conversion is recorded

Growing community of inventors

Yokohama, Japan

Tsutomu Matsumoto