Abstract: The present invention provides an electronic document authenticity assuring method in which a series of procedures concerning redactable signature are divided into procedures dependent on a document to be signed and procedures dependent on a redactable signature method. Further, the present invention provides program codes that realize the divided procedures and a system comprising apparatuses for implementing those program codes. According to the present invention, even when type of electronic document to be signed is changed or added to, it is sufficient to add a procedure dependent on a document to be signed, without changing procedures dependent on redactable signature methods. Similarly, even when a redactable signature method is to be changed or added, it is sufficient to add a procedure dependent on the redactable signature method without changing procedures dependent on document to be signed.

Abstract: An encryption processing part of a controller of each of user devices specifies components of content as encryption target parts, creates an encryption key creation key by reading out a public key, for each of the encryption target parts, of a second user who is allowed to view the encryption target part, raising a secret key of an administrator of the content data to the power of the public key thus read out, and calculating a remainder, encrypts random numbers each corresponding to each of the encryption target parts by using the encryption key creation key, creates an encryption key for each of the encryption target parts, and encrypts, by using the encryption key created for each of the encryption target parts, each of the encryption target parts corresponding to the encryption key.

Abstract: Disclosed are a motor vehicle drive control system, which easily detects accelerations, generated in the up and down, front and rear, and left and right of a motor vehicle body, in high degree of accuracy, and performs the stability control of a motor vehicle, and its sensor unit. Sensor units provided in four corners of the front and rear, and left and right of the motor vehicle body detect accelerations generated in X-, Y-, and Z-axis directions, and digital values of detection result are transmitted to a monitoring device as digital information via an electromagnetic wave. The monitoring device outputs this digital information to a stability control unit. The stability control unit performs the correction control of drive of a subthrottle actuator or a brake drive actuator on the basis of the acceleration values obtained.

Abstract: A need exists for a technology for guaranteeing the authenticity of an electronic document, and an information disclosure system, which can guarantee the authenticity of a disclosed document and delete information regarded as inappropriate for disclosure. An electronic document is divided into components, and a random number generated from a seed value is concatenated to each of the components. A hash value is calculated for each of the components with which the random numbers have been concatenated. The calculated hash values are further concatenated using a hash function to generate data to which an digital signature is applied.

Abstract: Disclosure of information is controlled selectively depending on users such that a plurality of users having different roles bearing no inclusive relation with one another can access the same area. Content is divided into a plurality of areas. For each of the areas obtained by division, secret keys (encryption/decryption keys in symmetric-key cryptography) are generated. The generated keys are encrypted using public keys in public-key cryptography, which are set in advance for the users depending on their respective roles. In the case where the content is to be disclosed to a plurality of users having different roles, the encryption of secret keys is performed separately for each user. These encrypted contents and encrypted secret keys are used to generate encrypted text.

Abstract: The present invention is to provide a semiconductor acceleration sensor capable of sensing accelerations in two directions parallel to the surface of a diaphragm and orthogonal to each other with respective proper sensitivities. A semiconductor acceleration sensor is constituted of diaphragm pieces extending from the center of the diaphragm surface to a wafer outer-circumferential frame section, respectively, along an X axis direction and a Y axis direction orthogonal to each other. On the upper surface of the diaphragm pieces, there are formed piezo resistors Rx1 to Rx4, Ry1 to Ry4, Rz1 to Rz4. In the diaphragm pieces disposed on a single line along the X axis direction and the diaphragm pieces disposed on a single line along the Y axis direction, the areas of cross section orthogonal to the axis are set according to a maximum value of acceleration, respectively, in the X axis direction or Y axis direction.

Abstract: The invention provides a tire with an electric power generation device for supplying sufficient electric power which has a simple and small-sized construction. An electric power generation device for converting strain occurring in a tire into electric energy includes at least one electric power generation element and a device body. The electric power generation element has at least two stretchable electrodes and a dielectric elastomer, arranged between the electrodes, and producing a potential difference between the electrodes according to the strain applied from the tire. The device body has an electrical condenser for accumulating electric energy produced by the electric power generation element. The length, in the circumferential direction of the tire, of the electric power generation element is set so that strain by contraction and strain by expansion that are caused by the rotating tire coming into contact with the ground surface are not simultaneously applied to the single power generation element.

Abstract: A transponder which does not require a power source used in an in-wheel motor system and a wheel therewith. The transponder comprises a data transmit/receive antenna, a data transmit/receive section, a sensor circuit, and a sensor power circuit. The sensor power circuit is constituted of a rectification circuit (energy converting means), a storage device and a charging coil and the input side of the rectification circuit is connected to a charging coil and the output side of the rectification circuit is connected to the storage device. The transponder is mounted on a motor rotor provided on an internal surface of a rim section in a tire constituting the wheel, and the charging coil is fixed so as to penetrate through a magnetic field produced by a motor stator.

Abstract: Content is divided into a plurality of partial contents. Next, each of the partial contents is encrypted using a browsing-control-use secret key. Also, an editing-control-use secret key and a partial-content validation key are generated, then generating the feature value for each of the partial content. Moreover, key-encrypted data is generated by encrypting the browsing-control-use secret key and the editing-control-use secret key corresponding to each of the browsable and editable partial contents, using the public key of a user. Finally, encrypted content is generated from the key-encrypted data, encrypted partial contents, and the partial-content validation key.

Abstract: Provided is a technology with which an electronic document including a plurality of elements such as texts and images may be partially encrypt and decrypt. An encryption-processing control unit receives a selection of electronic data included in an electronic document and a selection of an encryption key for encrypting the electronic data from among encryption keys stored in a storing unit. The encryption-processing control unit generates encrypted area data including partially encrypted data obtained by encrypting the selected electronic data with the selected encryption key, positional information for specifying a position of the selected electronic data in the electronic document, and decryption information including information that may specify a decryption key with which the partially encrypted data may be decrypted, and adds the encrypted area data to the electronic document.

Abstract: The invention provides a tire with an electric power generation device for supplying sufficient electric power which has a simple and small-sized construction. An electric power generation device for converting strain occurring in a tire into electric energy includes at least one electric power generation element and a device body. The electric power generation element has at least two stretchable electrodes and a dielectric elastomer, arranged between the electrodes, and producing a potential difference between the electrodes according to the strain applied from the tire. The device body has an electrical condenser for accumulating electric energy produced by the electric power generation element. The length, in the circumferential direction of the tire, of the electric power generation element is set so that strain by contraction and strain by expansion that are caused by the rotating tire coming into contact with the ground surface are not simultaneously applied to the single power generation element.

Abstract: An object of the invention is to allow cipher strength evaluation when available resources such as the complexity and the number of plaintext available for decryption have conditions, and to allow comparison of cipher strength under given conditions. The invention combines the exhaustive search with an algebraic method, sets conditions for resources such as the complexity and the number of plaintext available for decryption beforehand, and utilizes the linear dependency of a decryption equation for use in decryption to optimize a decryption method as the maximum number of available plaintext is secured. Thus, it reduces the complexity and allows efficient search of solutions for the decryption equation.

Abstract: An anti-lock brake system and a sensor unit for the system, where acceleration occurring in a wheel is easily detected with high accuracy to perform braking control of a motor vehicle. Sensor units (100) having acceleration sensors that detect acceleration occurring, with the rotation of tires (300), in X, Y, and Z directions including the tire rotating direction are provided on rotating bodies of rotation mechanism portions including each tire (300). The sensor units (100) transmit digital values of the detected result as digital information by an electromagnetic wave. The digital information is received by a monitor device (200) provided on each tire house, and an acceleration value obtained by calculation is outputted to a brake control unit (600).

Abstract: A road surface condition detection system capable of quickly and accurately detecting road surface conditions during vehicle running, an active suspension system and an anti-lock brake system using the road surface condition detection system, and a sensor unit for the road surface condition detection system are provided. A sensor unit, provided on a rotor of a rotation mechanism section of a wheel, has an acceleration sensor for detecting an acceleration occurring in the rotational direction of the wheel as the wheel rotates. A signal of the detected acceleration is received by a monitor device, the received signal is compared to a variation pattern of an acceleration signal for each road surface condition, the pattern being previously stored in a storage section to identify a road surface condition, and information of the identified condition is output. Drive control of the active suspension system and the anti-lock brake system is made based on the information of the road surface conditions.

Abstract: A method is provided for applying a redactable signature method capable of verification even after deletion (blacking-out) of a part of a signed electronic document to spreadsheet data. By giving an ID for a redactable signature to a cell to be processed in the processed data by a spreadsheet program, which part in the file corresponds to the cell to be processed can be easily determined when the data is outputted as a file.

Abstract: An object of the present invention is to provide a semiconductor acceleration sensor capable of sensing accelerations in two directions parallel to the surface of a diaphragm and orthogonal to each other with respective proper sensitivities. There is constructed a semiconductor acceleration sensor 10 constituted of diaphragm pieces 13a to 13d extending from the center of the diaphragm surface to a wafer outer-circumferential frame section 12a, respectively, along an X axis direction and a Y axis direction orthogonal to each other. On the upper surface of the diaphragm pieces, there are formed piezo resistors Rx1 to Rx4, Ry1 to Ry4, Rz1 to Rz4. In the diaphragm pieces 13a and 13b disposed on a single line along the X axis direction and the diaphragm pieces 13c and 13d disposed on a single line along the Y axis direction, the areas of cross section orthogonal to the axis are set according to a maximum value of acceleration, respectively, in the X axis direction or Y axis direction.

Abstract: An object of the present invention is to provide a power generating device which makes it possible to easily generate electric power in a rotating system, such as a wheel including a tire, without impairing the performance and reliability of the rotating system. In the case where the power generating device is mounted to a rotating body such as a tire, the direction of gravity applied to a weight is changed with the rotation of the rotating body to cause beams to be deflected, so that the positions of the deflected beams and the weight are fluctuated in synchronization with the period of the rotation to cause the position of a coil to be displaced. Thereby, the weight is vibrated in the vertical direction in synchronization with the period of the rotation of the rotating body to change the magnetic flux density crossing the coil. As a result, AC electromotive forces are generated in the coil to enable electric power to be generated.

Abstract: The present invention provides an electronic document authenticity assuring method in which a series of procedures concerning redactable signature are divided into procedures dependent on a document to be signed and procedures dependent on a redactable signature method. Further, the present invention provides program codes that realize the divided procedures and a system comprising apparatuses for implementing those program codes. According to the present invention, even when type of electronic document to be signed is changed or added to, it is sufficient to add a procedure dependent on a document to be signed, without changing procedures dependent on redactable signature methods. Similarly, even when a redactable signature method is to be changed or added, it is sufficient to add a procedure dependent on the redactable signature method without changing procedures dependent on document to be signed.

Abstract: A Feistel encryption apparatus having a plurality of steps of accepting unstirred text, stirring with an extended key, and calculating stirred text for encrypting plaintext step by step, the apparatus is allowed to utilize cryptanalysis conditions held at given predetermined steps, and decryption with higher order differences determined from stirred text at these steps is allowed. The invention can secure all the estimated extended keys including the last-step extended key to be right with a desired probability as well as it allows decryption by less complexity. The invention allows MISTY1 with six rounds without an FL function to be decrypted with 239 of selected plaintext and the complexity of 249 of an FO function. It also allows MISTY1 with seven rounds without the FL function to be decrypted with 239 of selected plaintext and the complexity of 2124 of the FO function.

Abstract: What are provided are a motor vehicle drive control system, which easily detect accelerations, generated in the up and down, front and rear, and left and right of a motor vehicle body, in high degree of accuracy, and performs the stability control of a motor vehicle, and its sensor unit. Sensor units 100 provided in four corners of the front and rear, and left and right of the motor vehicle body detect accelerations generated in X-, Y-, and Z-axis directions, and digital values of detection result are transmitted to a monitoring device 200 as digital information via an electromagnetic wave. The monitoring device 200 outputs this digital information to a stability control unit 700. The stability control unit 700 performs the correction control of drive of a subthrottle actuator 412 or a brake drive actuator 640 on the basis of the acceleration values obtained.