Abstract: The invention provides a traction control system and sensor unit thereof which easily and highly accurately senses accelerations generated vertically, longitudinally and laterally in a wheel to control the drive of the vehicle. A sensor unit provided with an acceleration sensor sensing accelerations generated in association with rotation in the X, Y and Z directions including the rotation direction is disposed in a body of rotation of a rotation mechanism section including each tire NO, and the sensing result, a digital value, is transmitted as digital data by use of radio wave. The digital data is received by a monitor apparatus disposed in each tire house and is subjected to arithmetic processing. The acceleration value thus obtained is outputted to a drive control unit.

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: An electronic data disclosure system including a submitter device, an electronic disclosure device, and a reader device is provided. The submitter device is configured to execute the steps of, creating submission data and transmitting the submission data to the electronic disclosure device. The electronic disclosure device is configured to execute the steps of receiving the submission data from the submitter device, giving a digital signature to the submission data received and disclosing the submission data to which the digital signature has been given. The reader device is configured to execute the steps of obtaining the submission data disclosed by the electronic disclosure device, to which the digital signature has been given, displaying the submission data to which the digital signature has been given, performing signature verification of the submission data to which the digital signature is given and displaying a result of the signature verification.

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: 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: 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 10 is mounted to a rotating body such as a tire, the direction of gravity applied to a weight 113 is changed with the rotation of the rotating body to cause beams 111 to be deflected, so that the positions of the deflected beams 111 and the weight 113 are fluctuated in synchronization with the period of the rotation to cause the position of a coil 121 to be displaced. Thereby, the weight 113 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 121. As a result, AC electromotive forces are generated in the coil 121 to enable electric power to be generated.

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: 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: An original signature can be verified even if a signed image data is properly altered in its portion. The digital image data is divided into a plurality of configurational elements, and each of the feature values of the elements are calculated, so that the signature is created by combining the feature values. In case the configurational elements are to be deleted, they are substituted by substitutive data, and only the feature values are stored. The verification is created by using the stored feature values as the substituted elements and by using the calculated feature values as the remaining elements, so that the signature is verified with the signature attached to the digital image data.

Abstract: An intra-vehicle LAN system combining electric power supply includes a main controller having control signal generation device for generating a control signal used to control each of on-vehicle electric equipments and outputting the control signal to an electric power supply line through which electric power is supplied to the electric equipments and an electric equipment control unit being provided between the electric power supply line and each of the electric equipments to detect the control signal transmitted through the electric power supply line and to control each of the electric equipments. In this system, the generated control signal contains an ID for specifying each of the electric equipments.

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: 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: An intra-vehicle LAN system combining electric power supply includes a main controller having control signal generation device for generating a control signal used to control each of on-vehicle electric equipments and outputting the control signal to an electric power supply line through which electric power is supplied to the electric equipments and an electric equipment control unit being provided between the electric power supply line and each of the electric equipments to detect the control signal transmitted through the electric power supply line and to control each of the electric equipments. In this system, the generated control signal contains an ID for specifying each of the electric equipments.

Abstract: A network system of on-vehicle electric devices in which a central control unit mounted on a vehicle and a plurality of on-vehicle electric devices are connected includes one transmitter-receiver and a plurality of electrical device controllers. The one transmitter-receiver is mounted on the vehicle, is connected to the central control unit in a wired manner and includes and antenna for transmitting/receiving therethrough a signal in a wireless manner. The plurality of electric device controllers are provided in on-to-one correspondence to the plurality of on-vehicle electric devices. Each of the electric device controllers includes and antenna for transmitting/receiving therethrough a signal to/from the transmitter-receiver in a wireless manner as to control corresponding one of the on-vehicle electric devices on the basis of the received signal or to process a signal generated by the corresponding one of the on-vehicle electric devices to transmit the processed signal to the transmitter-receiver.