Hitachi, Ltd.

Hitachi Chubu Software, Ltd.

Hitachi Control Systems, Inc.

Other

Hitachi Research Institute

Fujitsu Corporation

Tokyo, Japan

Kazuo Takaragi

Ryoichi Sasaki

Hiroshi Yoshiura

Chikashi Okamoto

Kunihiko Miyazaki

Seiichi Susaki

Mitsuo Usami

Yasuko Fukuzawa

Hiroyuki Kurumatani

Kazutaka Tsuji

Chizuko Yasunobu

Takeshi Matsuki

Hisashi Toyoshima

Soichi Furuya

Hiroshi Matsumoto

Dai Watanabe

Hiroyuki Yagi

Yasuhiro Tsunemi

Tsutomu Nakamura

Tsutomu Matsumoto

Seiichi Domyo

Mitsuru Iwamura

Masashi Takahashi

Hisayoshi Sato

Asahiko Isobe

Seiji Miyazaki

Fusao Nakagawa

Hideki Tokuyama

Takeshi Saito

Shigeru Hirahata

Makoto Aikawa

Akira Sato

Kenji Sameshima

Tsukasa Saito

Yasuhiro Ishii

Shojiro Asai

Yusuke Hino

Takayoshi Shiraishi

Yutaka Otsu

Toshiyuki Moritsu

Mizuhiro Sakai

Asahiko Sobe

Mayuko Shimizu

Hiroo Okamoto

Satoshi Miyazaki

Atsushi Tanaka

Takaharu Noguchi

Masahiro Mimura

Akinobu Shimada

Minoru Koizumi

Kenta Takahashi

Masafumi Nozawa

Manabu Sasamoto

Yoshiyuki Nakayama

Naoya Torii

Toshiaki Arai

Masaru Ohki

Hiroyuki Koreeda

Kazuaki Tanaka

Yoshimichi Kudo

Masato Arai

Kenjiro Mori

Kenji Kataoka

Hiroyuki Maezawa

Yasuhiko Nagai

Shinji Itoh

Tokuhiro Tsukiyama

Fujio Fujita

Shinobu Koizumi

Hiroyoshi Tsuchiya

Toshifumi Nishimura

Katsuharu Kakuse

Kiyoshi Yata

Hajime Morito

Singi Domen

Rei Itsuki

Hikari Namba

Masahiro Yamashita

Hisanori Mishima

Kunihito Takeuchi

Masakatsu Nishigaki

Takeshi Tanida

Tooru Kawai

Masahiro Mambo

Eiji Okamoto

Yasushi Kuba

Kazuo Hashimoto

Nobuhiro Kurashiki

Yoichi Shibata

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

A method and a device for managing a computer network, especially a technique for ensuring the security of a network. A computer network system in which computers are connected to each other through transmission lines, each computer stores the data which constitutes a moving type software exclusively used for security and transmitted together with a message when the computer transmits the message to another computer of the system, and executes the moving type software by using the stored data upon receiving a message from another computer.

Method and a device for sterilizing downloaded files

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

In a method of mounting a planar electronic circuit chip onto a flexible sheet together with another planar electronic element, the electronic circuit part and the another electric element are selected so that the planar surface of the another electric element is greater than the planar surface of the electronic circuit chip, and the another electric element and the electronic circuit chip are mounted on the sheet so that the planar surface of the another electric element and the planar surface of the electronic circuit chip are in parallel with the sheet surface, and the planer surface of the electronic circuit chip is accommodated within the planar surface of the another electric element as viewed in a direction perpendicular to the sheet surface.

Method of mounting electronic circuit chip

A unique code generating apparatus for generating, according to biometric information representing a physical or behavioral feature of a user, a unique code as a unique value for the biometric information includes a statistic information generating section for conducting statistical analysis for a feature of biometric information for registration and generating statistic information, a statistic information table generating section for summarizing the statistic information for each biometric information, setting a unique code for each statistic information, and generating a statistic information table unique to the biometric information, a unique code extracting section for applying to the statistic information table the statistic information generated by the statistic information generating section according to biometric information for collation and extracting an associated unique code from the table, and an output processing section for outputting the unique code extracted by the unique code extracting section to an output interface.

Unique code generating apparatus, method, program and recording medium

A symmetric-key cryptographic technique capable of realizing both high-speed cryptographic processing having a high degree of parallelism, and alteration detection. The invention includes dividing plaintext composed of redundancy data and a message to generate plaintext blocks each having a predetermined length; generating a random number sequence based on a secret key, generating a random number block corresponding to one of the plaintext blocks from the random number sequence, outputting a feedback value obtained as a result of operation on the one plaintext block and the random number block, the feedback value being fed back for using the operation on another plaintext block, and performing an encryption operation using the one plaintext block, random number block, and feedback value.

Method and apparatus for symmetric-key decryption

The technology includes the steps of: associating material-object identification code identifying each individual material object with material-object information representing information about material object identified by identification code and storing identification code and material-object information in material-object information database in each of business categories; sending code and information stored in database in each business category; integrating items of information having same code with each other among codes and items of information received from database in each business category to generate integrated material-object information, associating identification code with integrated material-object information identified by code and storing identification code and integrated material-object information in integrated database; requesting to send integrated material-object information associated with given identification code; reading requested integrated material-object information from integrated database and sending integrated information to requester of integrated material-object information; and receiving and outputting sent integrated material-object information.

Database integration management method and apparatus and processing program, medium therefor

A method is adopted in a control apparatus for controlling ID information stored in a storage medium in conjunction with a terminal for reading the ID information from the storage medium and used to catalog information for the storage medium into a memory employed in the control apparatus. In an operation to catalog information into the memory of the control apparatus, the terminal receives the information, reads the ID information from the storage medium and transmits the information and the ID information to the control apparatus and the control apparatus catalogs the information and the ID information in the memory by associating the information with the ID information. In an operation to examine information already cataloged in the memory employed in the control apparatus, the terminal reads the ID information from the storage medium and transmits the ID information to the control apparatus; and the control apparatus transmits the information already cataloged in the memory and associated with the ID information to the terminal for displaying the information.

Terminal for use in a system interfacing with storage media

A method of checking a sheet as to forgery thereof, the sheet being provided with an electronic circuit chip from or in which information can be read out or written and having visible information. The method includes a step of encrypting the visible information of the sheet and storing the encrypted visible information in the electronic circuit chip, and a step of determining discriminatively the authenticity of the sheet by comparing the visible information of the sheet with the information stored in the electronic circuit chip.

Method of checking authenticity of sheet with built-in electronic circuit chip

A non-contact identification semiconductor device is provided with a semiconductor chip including a receiving circuit that receives an inquiry to the non-contact identification semiconductor device, a memory that stores identification information of multiple bits and a sending circuit that sends the identification information. An antenna coupled to said semiconductor chip receives the identification information from said semiconductor chip and transmits the identification information outside of said non-contact semiconductor. The long side length of the semiconductor chip is not greater than 0.5 mm in plane dimension, and the identification information is stored by a pattern printed by an electron beam.

Semiconductor devices and manufacturing method therefor

In a buffer and a state included in a pseudorandom number generating apparatus, the state has the configuration of assuming that the unit length of data processing is n, the state has a size of 3&#xd7;n bits, and the buffer has a capacity of 32&#xd7;n bits, and according to clock control, a state transformation section (state transformation function) for conducting a state alteration from time t to time t+1 uses a nonlinear function F (having an n-bit input and an n-bit output) twice, or two different nonlinear functions F and G respectively once. The state transformation section has such a configuration that a nonlinear function such as a round function of a block cipher sufficiently evaluated as to the cryptographic security and implementation.

Pseudorandom number generating apparatus or encryption or decryption apparatus using the same

Techniques of improving the safety of an information processing system at low cost are provided, the information processing system having an OS provided with an access control function based upon discretionary access control for preventing illegal accesses to files. A method and apparatus for providing the information processing system with functions and areas usable only by a specific user different from a system administrator. The areas are provided with an access control function in order to prevent the access control function from being tampered.

Trusted computer system

A symmetric-key cryptographic technique capable of realizing both high-speed cryptographic processing having a high degree of parallelism, and alteration detection. The invention includes dividing plaintext composed of redundancy data and a message to generate plaintext blocks each having a predetermined length, generating a random number sequence based on a secret key, generating a random number block corresponding to one of the plaintext blocks from the random number sequence, outputting a feedback value obtained as a result of operation on the one plaintext block and the random number block, the feedback value being fed back for using in the operation on another plaintext block, and performing an encryption operation using the one plaintext block, random number block, and feedback value.

Growing community of inventors

Ebina, Japan

Kazuo Takaragi