Fujitsu Corporation

Fujitsu Advanced Engineering Limited

Takashi Yoshioka

Masahiko Takenaka

Tetsuya Izu

Bintatsu Noda

Kiyohide Yamashita

Fumitsugu Matsuo

Fumiaki Chiba

Souichi Okada

Takayuki Hasebe

Hiroshi Tsuda

Seigo Kotani

Hirohisa Naito

Takumi Kishino

Yasutsugu Kuroda

Yasuyuki Higashiura

Etsuo Ono

Akira Miyazaki

Takato Ohashi

Naoshi Kayashima

Takeaki Terada

Keizo Sato

Hiroki Inoue

Shuichi Takayama

A signature device including a storage unit configured to store moving image data, and a processor configured to extract original metadata from moving image data for the image data of each of a plurality of images forming the moving image data, the original metadata including location data of the image data and identification data of the moving image data, to encode the image data of each of the images into still image data in accordance with an image format, to write the still image data into a first area, to write the original metadata extracted by the extractor into a second area, the first area and the second area being included in a storage area of a still image data file in which the still image data is filed, and to generate summary data for the still image data file.

Signature device and signature method

A stream data management method includes: storing in a sequence header of the top original moving image information a terminal ID indicating a terminal which generated original moving image information and date-and-time information which is guaranteed by a third party, storing in a sequence header of the next original moving image information a characteristic value of the last partial information of the preceding original moving image information, generating signature-related information of the original moving image information, generating cutout moving image information to which a sequence header is added, generating signature-related information of the cutout moving image information, and verifying originality and actual time of cutout stream data based on the cutout moving image information, the signature-related information of the cutout moving image information, and the signature-related information of the original moving image information.

Stream data management program, method and system

Preliminarily sharing internal-transmission-secret-key-information used in e-mail addressed to an internal-network, between transmitting and receiving-terminals, and generating external-transmission-secret-key information used in an e-mail addressed to an external-network and external-transmission-public-key-information corresponding to the external-transmission-secret-key-information, in transmitting a mail, generating verification-information by encrypting first characteristic-amount-target-information including a characteristic-amount-target-item included in an outgoing-mail and adding, to the outgoing-mail header, the verification-information and characteristic-amount-target-item-information corresponding to the characteristic-amount-target-item, and, in receiving a mail, generating second characteristic-amount-target-information including a characteristic-amount-target-item indicated by the characteristic-amount-target-item-information added to the incoming-mail, decrypting the verification-information, generating third characteristic-amount-target-information, and verifying whether the second and the third coincide.

Detection method for fraudulent mail, detection program therefor, and detection device therefor

A digital signature program includes computer-executable instructions for giving a numerical value in a state where header information necessary for playback of each partial data item may be added to the partial data item resulting from the division to a one-way function to generate an output value sequence of the one-way function concerning the multiple partial data items. The program also includes computer-executable instructions for generating binary trees concerning the streaming data, having leaves including only the output values in the output value sequence; and computer-executable instructions for using an output value indicating a root of the generated binary trees to generate a digital signature of a signer for the streaming data.

Digital signature system and digital signing method

A digital signature apparatus including, a converting unit that converts, based on a first video image frame being independently replayable, a predicted frame being not independently replayable into a second video image frame being independently replayable, an encoding unit that encodes the first or second video image frame into an image data according to an image format, a transfer unit that transfers, when receiving the predicted frame, the predicted frame to the converting unit, and transfers, when receiving the first or second video image frame, the received video image frame to the encoding unit, and a digest information generating unit that generates a digest information for each of image data encoded by the encoding unit.

Digital signature apparatus and method

A verification devicereceives extracted and sanitized datathat has been sanitized to protect the privacy of person A. The verification device, extracts from among MCU-hash storage dataand for MCUand MCUamong MCUs obtained by dividing the extracted and sanitized data, an MCUhash and an MCUhash. The verification devicegenerates an MCUhash to an MCUhash and from the MCUhash to the MCUhash, generates a JPEG frame hash. The verification device 101 then compares a JPEG hashand the JPEG hashto verify the authenticity of the extracted and sanitized data

Verification method, verification device, and computer product

A method includes: generating object information that indicates an object designated from among a header item, text, and attached information of a received email, or feature amount information based on the object information and a predetermined function, when a source is an address in an internal network, decrypting verification information added to the received email using secret key information shared in the internal network, when the source is an address over an external network, decrypting the verification information using public key information shared with the source, and verifying whether or not the received email is a spoofed mail based on the object information or the feature amount information, and the decrypted verification information.

Detecting method and device

A signature management apparatus and method of cutting-out streaming data. The signature management apparatus includes a signature-related information preparing device which prepares signature-related information for streaming data, a signature-related information storage device which partitions a sequence header of the streaming data into stream header information needed for reproduction of the streaming data and user header information which a user can freely use for storage, and stores the signature-related information within the user header information in a form that allows no start code to emerge.

Signature management method and signature management device

An E-mail information management apparatus acquires a plurality of predetermined information from a mail header and a mail body and signature related information as signature target information, produces feature variable information and electronic signature data, and stores the signature target information, the variable information and the electronic signature data, as signature header information in a header portion of the E-mail.

E-mail information management apparatus, and E-mail information management method

A still image verifying apparatus includes, a storage unit that stores a plurality of pieces of summary information generated respectively from a plurality of pieces of still image data, a recording unit that records edited image data obtained by performing an edit process on still image data, and a still image decoding unit that generates decoded still image data by retrieving from the recording unit. The apparatus includes a still image determining unit that determines whether the generated decoded still image data matches the edited image data, a digest generating unit that generates summary information by retrieving from the recording unit, a digest information verifying unit that retrieves summary information corresponding to the edited image data and compares the generated summary information with the retrieved summary information and an edited still image verifying unit that verifies the authenticity of the edited image data.

Still image verifying apparatus and method

An electronic document management program, an electronic document management method and an electronic document management apparatus acquire a plurality of pieces of part identification information respectively identifiably expressing a plurality of parts of document information and a digital signature corresponding to the document information, acquire the preparation type, the preparer's name and the time and date of preparation of the document information as tracing information of the document information, manage the part identification information, the digital signature and the tracing information in association with each other and present information relating to the tracing information to the user in response to a request from the user. Additionally, they acquire new document information and tracing information according to a directive from the user.

Program, method and apparatus for managing electronic documents

It is an object to provide a mechanism that can efficiently collect and accumulate unspecified large number of information as much as possible for marketing activities and that can make use of the information. An information collection program includes: an information receiving step that receives information provided from an information provider; an information collecting/managing step that manages the received information in association with the information provider; an information analyzing step that analyzes the managed information; an analysis information managing step that manages the analyzed information; a feedback information receiving step that receives evaluation based on a result of utilizing the analyzed information as feedback information; and an evaluating step that gives an evaluation point to the information provider or the provided information based on the received feedback information.

Information collection program, information collection apparatus, and information collection method

A signature generating device includes a receiving unit that receives a sequence of data; a summary data generating unit that generates summary data of the data upon reception of each of the data by the receiving unit; an obtaining unit that obtains, when the number of data included in a sequence of the generated summary data reaches a given number, the sequence of the summary data as a block; a setting unit that sets, as a signature subject, a current block constituted by the sequence of the summary data, and the summary data selected from at least one block contiguous to the current block; a digital signature generating unit that generates a digital signature concerning data summarized for the current block; and a sending unit that sends the generated digital signature, the signature subject associated with the digital signature, and the data summarized for the current block.

Signature generating device and method, signature verifying device and method, and computer product

An electronic image data verification program disclosed herein is capable of detecting presence or absence of a change, specifying a changed portion (the position of a change) if present, and making the presence or absence and the changed portion provable to third parties, by generating partial signature information separately from electronic image information to be registered, by dividing and maintaining the partial signature information, and by clearly separating functions/roles of the electronic image information (original information) and the partial signature information (verification information). The present invention comprises: a partial signature information generation sectionthat uses partial information of electronic image information, to generate partial signature information for specifying presence or absence of a change to the electronic image information and a changed portion if a change has been made; a registration sectionthat registers the electronic image information and the partial signature information generated from the electronic image information; a storage section; and a partial signature verification sectionthat uses the electronic image information and the partial signature information registered by the registration section, to verify presence or absence of the change to the electronic image information, or a changed portion if a change has been made to the electronic image information.

Growing community of inventors

Kawasaki, Japan

Takashi Yoshioka