Hitachi, Ltd.

Hitachi Control Systems, Inc.

Mitsubishi Electric Corporation

Hitachi Microcomputer Engineering, Ltd.

Hitachi Metals, Ltd.

Hitachi Information Control Systems, Inc.

Ryoichi Sasaki

Kazuo Takaragi

Hiroshi Yoshiura

Seiichi Susaki

Kunihiko Miyazaki

Mitsuru Iwamura

Michio Suzuki

Tsutomu Matsumoto

Takeshi Matsuki

Hisashi Toyoshima

Takayoshi Shiraishi

Shinichiro Miyaoka

Fusao Nakagawa

Tsutomu Nakamura

Isao Echizen

Yasuhiko Nagai

Tsukasa Saito

Shinobu Eikawa

Toshiyuki Moritsu

Mizuhiro Sakai

Shinichiro Harano

Motohisa Funabashi

Hiroshi Morita

Minoru Koizumi

Yutaka Fukui

Fumito Nakajima

Rikizo Watanabe

Tadashi Kaji

Yasuko Fukuzawa

Kuniaki Tabata

Ryo Hiraga

Hideaki Kobayashi

Mikihiko Onari

Hiroshi Koike

Mitsuo Kuriyama

Satoru Tezuka

Masao Shiga

Takahiro Akimoto

Shimpei Matsuda

Kenji Kataoka

Isao Masaoka

Akira Horiki

Shigeo Hattori

Seishin Kirihara

Hiroyuki Maezawa

Katsuyuki Umezawa

Rie Kobayashi

Noboru Mizuhara

Takatoshi Yoshioka

Hirokazu Aoshima

Nobuyuki Fujikura

Shinobu Koizumi

Hisao Itow

Akira Kito

Fumio Hataya

Munehiko Tonami

Hideo Noyama

Takashi Kagei

Koichi Yamano

Ryoya Ichioka

Singi Domen

Goro Ikeba

Nobuhiko Ido

Tomoaki Tsunoda

Hidehiro Oomae

Kazuyuki Hayashi

Takashi Akaosugi

Tomoaki Takagi

Kunihito Takeuchi

Yasuhiko Mori

Kohsuke Shinnai

Minoru Sugano

Keizou Mizuguchi

Hisanori Mishima

Keizou Mizoguchi

Kenzo Iioka

Masashi Amano

Koichi Taguchi

Kaori Kondoh

Hiroshi Isobe

Sadao Niinobe

Masasumi Kokawa

Nobuhiro Kurashiki

Masayoshi Hagiwara

Yasuo Masui

Yoshihisa Ikeda

Yasuhiro Nagai

Shunichi Yosioka

A programmable controller includes a parameter manager to manage a parameter including an operation mode setting indicating whether an operation mode of the programmable controller is an active mode or a debug mode, and a character string data outputter to output character string data based on a message output command included in a program in the programmable controller. The message output command includes a first argument specifying whether a command is to be executed when the operation mode is the active mode or to be executed when the operation mode is the debug mode. The character string data outputter outputs or does not output the character string data to a preset destination, based on a result of a comparison between the operation mode setting and the first argument.

Programmable controller, programmable controller system, and recording medium

A memory diagnosis apparatus to diagnose whether a fault occurs in a memory includes a diagnosis execution unit to divide the memory into a plurality of areas, select two or more base areas that are diagnostic targets from among the areas to carry out a memory diagnosis including a reading test and a writing test, and perform only the writing test in carrying out the memory diagnosis on a same base area for second or more times. The diagnosis execution unit is implemented by an arithmetic device that is a processing circuit that executes a memory diagnosis program stored in a storage device.

Memory diagnosis apparatus and memory diagnosis program

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

According to the present invention, techniques, including a method and system, for restoring and/or validating data and/or associated signature log entries are provided. One embodiment of the present invention provides a method for validating a restored message, having an entry generated in a signature log for a message, where the entry includes cryptographic information associated with the message. Next, when said message is lost, the restored message is generated responsive to a request; and the restored message is validated using the signature log. In another embodiment a method for validating a selected log entry by using a signature log having a plurality of recorded log entries is provided. The method includes: computing a cryptographic value for the selected log entry; and determining if the cryptographic value is part of another recorded log entry.

Method and system for recovering the validity of cryptographically signed digital data

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 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

According to the present invention, techniques, including a method and system, for restoring and/or validating data and/or associated signature log entries are provided. One embodiment of the present invention provides a method for validating a restored message, having an entry generated in a signature log for a message, where the entry includes cryptographic information associated with the message; Next, when said message is lost, the restored message is generated responsive to a request; and the restored message is validated using the signature log. In another embodiment a method for validating a selected log entry by using a signature log having a plurality of recorded log entries is provided. The method includes: computing a cryptographic value for the selected log entry; and determining if the cryptographic value is part of another recorded log entry.

To lighten the processing load of embedding a digital watermark in content data, a preliminary process (embedding strength map generating process) run by a preprocessing section and the main process (digital watermark embedding process) run by a man processing section are run mutually independently. Specifically, the preliminary process of the preprocessing section is run each time new content data is stored to the content data database, and the main process of the main processing section is run when a content delivery request is received from a receiving terminal (client).

Digital watermark data embedding method, and digital watermark data embeddability analyzing method

A multimedia data distributing system comprising an ID issuing center side device and a multimedia data distributor side device for distributing multimedia data as electronic data to a purchaser of the multimedia data. The multimedia data distributor device includes: an attribute information transmitting unit that transmits attribute information of the electronic data indicating the multimedia data to be distributed, to the ID issuing center side device; a watermark information embedding unit that embeds information specifying the ID number transmitted from the ID issuing center side device in response to the attribute information transmitted to the attribute information transmitting unit, as an watermark information in the electronic data indicating the multimedia data to be distributed; and a distribution unit that distributes the electronic data indicating the multimedia data, in which the information specifying the ID number is embedded as the watermark information by the watermark information embedding unit, to the purchaser of the multimedia data. The ID issuing center side device includes: an ID number generating unit that generates a unique ID number and registering the generated ID number in a database in a manner to correspond to the attribute information transmitted by the distributor of the multimedia data; and an ID number transmitting unit that transmits the information specifying the generated ID number to the multimedia data distributor device.

Method and system for distributing multimedia data with management information

To enable the control of rendering contents in part by using digital watermark technique: a contents serving center for embedding watermark in contentsembeds control information as digital watermarks within at least one of a plurality of blocks constituting electronic data by which contents are represented, thereby specifying the application of filtering to a part of the contents corresponding to the block; a contents distribution centerdistributes the watermark-including contents to a receiving terminalwhere checks the blocks of the received data to detect whether the control information as digital watermarks is embedded therein and applies the filtering to the block for which the embedded control information embedded has been detected in advance of reproducing the contents.

Contents rendering control method, contents reproducing equipment, and contents distribution equipment

Digital signature generating method and digital signature verifying method

An authentication system for authenticating a particular individual using a recording medium containing information for identifying the individual has a recording medium issuing apparatus including, a database for storing a feature value usable for identification of the individual to be authenticated with the recording medium, means for managing the database to store the feature value of the individual to be authenticated with the recording medium and for generating search information to retrieve the feature value of the individual from the database, means for generating cryptographic information by encrypting the thus generated search information using a private key based on public key cryptography, and means for recording the thus generated cryptographic information and certification information concerning the individual onto the recording medium; and a recording medium authenticating apparatus including, means for decrypting the cryptographic information recorded on the recording medium using a public key paired with the private key to decode the search information, and means for searching the database using the thus decoded search information to retrieve the feature value of the individual.

Method of physical individual authentication and system using the same

This invention provides a method for identifying a purchaser who purchased content from which an illegal copy was produced. A provider system encrypts purchased by the purchaser using a public key of a purchaser system and sends the encrypted content to the purchaser system. The purchaser system creates a digital signature of the content with the use of a private key of its own and embeds the created digital signature into the received content. When an illegal copy is found, the provider system verifies the digital signature, embedded in the illegal copy as a digital watermark, to identify the purchaser who purchased the content from which the illegal copy was produced.

Digital data authentication method

A distributed object system comprising at least one object distributing server, at least one client terminal and at least one server object execution server according to the present invention, including: an object distributing server for storing an object program to which an electronic signature is affixed; a client terminal including means for down-loading the object program from the object distributing server, means for verifying the electronic signature affixed to the object program, means for executing the client object program when the completeness of the object program is confirmed and the user of the client terminal beforehand permits execution of the client object program which is electronically signed by a signatory, and means for transmitting the electronic signature affixed to the object program to a server object execution server; and a server object execution server including means for verifying the signature received, and means for supplying services to the user of the client terminal when the completeness of the object program is confirmed and the user and the object program permit use of the services in advance, which makes it possible to prevent a client object which is down-loaded to a client terminal through a network and executed therein from carrying out unjustified processing (not intended by a user using the client terminal) by using authority of the user.

Distributed object system and service supply method therein

Growing community of inventors

Fujisawa, Japan

Ryoichi Sasaki