Fujitsu Corporation

3m Innovative Properties Company

Citizen Holdings Company, Ltd.

Fijitsu Limited

Fujitsu Broad Solution & Consulting Inc.

Ryota Akiyama

Makoto Yoshioka

Takayuki Hasebe

Naoya Torii

Seigo Kotani

Takaoki Sasaki

Mitsuhiro Azuma

Yuzuru Koga

Masayuki Ishizaki

Akio Munakata

Masahiko Takenaka

Kenichi Utsumi

Kiyoshi Kohiyama

Fumio Amano

Yasuaki Morimoto

Noboru Iwayama

Nobuhide Aoyama

Yoshiaki Uchida

Tetsuo Hosokawa

Hiroaki Kikuchi

Masamichi Ishibashi

Kiyotaka Ogawa

Kazuta Saito

Toshihiro Yabe

Ichiro Anzai

Yusuke Yamanaka

Takeshi Hatano

Gengo Tazaki

Kazutoshi Motohashi

Yoshikazu Tsuji

Hiroyasu Itoh

Toru Nakagawa

Seiichi Urita

Kiyokatsu Iijima

Shigeyuki Okubo

Takeaki Kawashima

To provide a method of producing segmented chips preventing the chips from being damaged by the chip jumping or by the contact of the neighboring chips while the back surfaces thereof are being ground. A method of producing segmented chips by grinding the back surface of a material to be ground which includes a plurality of chips segmented into individual chips by at least partly cutting the chips in the direction of thickness thereof along the boundaries of the chips, wherein the gaps among the individual chips are filled with a liquid adhesive, the material to be ground is laminated on a rigid support material in a manner that the back surface thereof is exposed, and the adhesive is cured or solidified to form a laminate of the material to be ground having the plurality of chips, the adhesive solid material and the rigid support material arranged in this order; the laminate is ground from the back surface side of the material to be ground, the rigid support member is removed from the laminate, a flexible adhesive sheet is adhered onto the adhesive solid material, and the individual chips are picked up and recovered.

Method of producing segmented chips

A process, a device, and a computer-readable medium storing a program, for encryption. A conversion table having regions each of which stores 2character codes associated with index values is provided, where i is a natural number predetermined for each region, the 2character codes are defined in a predetermined character encoding scheme, and the index values have a minimum necessary bit length for uniquely identifying the 2character codes within each region. First character codes constituting a plaintext are converted into index values by reference to respectively corresponding regions of the conversion table. Then, the index values are encrypted without changing the bit lengths, and the encrypted values are converted into second character codes associated with index values identical to the encrypted values by reference to the respectively corresponding regions of the conversion table, a sequence of the second character codes is outputted as an encrypted text.

Encryption process, encryption device, and computer-readable medium storing encryption program

It is an object of the present invention to provide a time management apparatus and a time management method for reducing the opportunity for a third party to intentionally tamper with time. In order to achieve this object, the present invention is provided with time management apparatus including an external time fetching part for fetching an external time within a predetermined time span, a local clock part for outputting a self-advance time, and a time difference judgment part for calculating a difference between the external time fetched by the external time fetching part and the self-advance time output by the local clock part, setting the external time to the local clock part in a case where the difference is less than a predetermined value, and not setting the external time to the local clock part in a case where the difference is equal to or more than a predetermined value.

Time management apparatus and time management method

The authentication system has a signing station and a certifying station. The signing station divides the data to be transmitted into a plurality of data, a hash unit creates a plurality of authenticators by applying a different one-way function to each of the data. In the certifying station, a separating unit divides the data into a plurality of data, a hash unit creates a plurality of authenticators by applying a different one-way function to each data, and a comparing unit compares the authenticators prepared anew with the authenticators separated from the received data and checks the authentication of the data from the comparison.

Authentication system, authentication method, signing apparatus, signing method, certifying apparatus, certifying method, and a computer-readable recording medium with a program making a computer execute the method recording therein

This invention provides an input switchover means for switching input routes according to the type of medium or communications, a software management means for decoding encrypted software information and for managing monetary charges according to the usage amounts of this software, an information conversion section for converting decoded data outputted from the previously mentioned software management means to visible or audible data, and an output route switchover means for outputting to the previously mentioned software management means encrypted software data, and for outputting to the previously mentioned information conversion section non-encrypted software information.

Software reproduction apparatus

A valid medium issuing system reads a key Ka corresponding to an ID number from a key management book at a request from the script storage system to issue a script medium (MO), decrypts a valid medium certificate in a storage medium delivered from the factory using a key Ka, and generates a script medium (MO). The script medium (MO) is transmitted to the script storage system, and the script storage system records a script document on the script medium (MO). In this process, a decrypting process of a valid medium certificate is performed using the same key Ka, and after confirming the script of the storage medium, the script is recorded. With this configuration, a script document is recorded only for the script.

Valid medium management system

A storage medium stores encrypted electronic data, a medium personal number which is unique for each storage medium and encrypted permission information. At least the medium personal number is written onto the storage medium in an un-rewritable form which a user computer cannot rewrite.

Storage medium for preventing an irregular use by a third party

A local time is modified according to a radio wave time received from a time calibration signal transmitting station, as well as corrected according to an authentic time that is received from a time server when the difference between the local time and the radio wave time is less than a predetermined value as well as when the difference is equal to or greater than the predetermined value for a predetermined number of successive times. The local time is corrected while taking into consideration a delay period included in receiving the authentic time.

Method and apparatus for time calibration

A storage apparatus, capable of record or reproduce of an optical information recording medium in which ROM information is recorded with phase pits and RAM information is recorded on top of a recording region of the phase pits, has a main controller that, when the output of the recording information detection system&#x2014;a system for detecting reflected light of a laser beam from the optical information recording medium and generating signals corresponding to ROM and RAM information&#x2014;simultaneously contains ROM and RAM signals corresponding to ROM and RAM information, performs negative feedback control of a semiconductor laser emission using ROM signal in the output of the recording information detection system and performs control so as to obtain read-out and played-back ROM signal from the output of an optical intensity detection system for detecting the intensity of the laser light.

Storage apparatus

A file processing unit comprises a first signature information producing unit that produces first signature information in accordance with a predetermined rule utilizing the data of a file designated by a file close request issued in an application used in a computer system, and a signature information storage control unit that stores the first signature information, correlated with the file designated by the file close request, in a storage unit.

File processing unit

A cryptographic communication method is provided in which a cryptographic communication is performed by an easy operation even if both enciphered data and unenciphered data are mixed to be handled. In the transmission side, a communication key is used for enciphering data to be transmitted, and in the reception side the same communication key as in the transmission side is used for decoding received data. In the transmission side, an individual key that is different from the communication key is used for enciphering the data to be transmitted, the enciphered data are decoded by using the individual key first, and then the decoded data are enciphered by using the communication key so that the enciphered file can be transmitted.

Cryptographic communication method, file access system and recording medium

In a signature creating apparatus, a clock generates a time stamp and in which time can be set only by a computer installed in a certificate authority center. Further, connecting sections connects an apparatus ID for specifying an apparatus and the time stamp and personal identification information for identifying an implementor to a plain-text so as to create data for the signature. A signature creating circuit encrypts the data for the signature using a signature creating key or the like and generates the signature. A connecting section connects the signature to the data for the signature and transmits the data as data after signature.

Apparatus to create and/or verify digital signatures having a secure time element and an identifier of the apparatus

A storage apparatus is capable of using a storage medium having at least a first region for storing therein data and a second region for storing therein both use permission discrimination information indicative of permission of a predetermined access operation and use limit information with respect to the storage medium. The storage apparatus comprises a reading unit for reading the use limit information from the second region of the storage medium prior to an access to the storage medium, a collating unit for collating use permission discrimination information provided for a comparison purpose with the use permission discrimination information read out from the second region of the storage medium in the case that the use limit information indicates an 'access not-allowed condition', and a writing unit for rewriting the use limit information into such information indicative of an 'access allowed condition' when it is confirmed by the collation that the former use permission discrimination information coincides with the latter use permission discrimination information read out from the second region. As a result, an unauthorized use of the storage medium is prevented, improving security.

Storage apparatus and access control method

The present invention relates to a contrivance for inserting watermark information into a moving image. The watermark information indicative of the ownership of the copyright of the moving image is inserted into the frames of the moving image at irregular intervals, the frames being of such a number that the watermark information is visually unperceivable in the moving image. In addition, the insertion positions of the watermark information in the frames are determined on the basis of random number values. Besides, restrictive information for the copying of the moving image is inserted together with the watermark information. When the moving image has been brought to a standstill into a static image, the watermark information can be visually perceived with ease, so that illegality such as piracy can be readily exposed. Thus, the present invention can provide a simple and inexpensive scheme for the copyright protection of the moving image.

Device for generating, detecting, recording, and reproducing a watermarked moving image having a copy preventing capability and storage medium for storing program or the moving image

When encoding software, two or more encoding algorithms are employed. Conversely, for software decoding processing, decoding algorithms are prepared that correspond to these two or more encoding algorithms. Then, in software encoding processing, encoded algorithm combination identification information is transferred to the software decoding processing along with the encoded software. During software decoding processing, opposite algorithms possessed by the decoding means are selected based on the previously mentioned algorithm combination identification information, and the previously mentioned encoded software is decoded.

Growing community of inventors

Kawasaki, Japan

Ryota Akiyama