Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Takatoshi Ono

Natsume Matsuzaki

Takefumi Inoue

Motoji Ohmori

Shunji Harada

Takeshi Saijo

Yasuo Okumura

Toshihisa Nakano

Yuichi Futa

Makoto Tatebayashi

Atsushi Yamashita

Tetsuya Inoue

Kiyomi Sakamoto

Atsushi Iisaka

Hiroki Murakami

Kiyotaka Sasanouchi

Kimiya Ikushima

Atsuko Miyaji

Norifumi Sata

Hidekazu Tanaka

Toru Arakawa

Masahiro Mizukami

Hiroyuki Togawa

Syunji Harada

Shigeru Yamada

Yoji Kumazaki

Takuo Osaki

Michiharu Honda

Hiroshi Kashiwa

The present disclosure provides an input device that puts signals into equipment in response to turning action and that can come down in thickness along an axis of a rotary shaft. The input device includes a knob configured to be turned, a rotary shaft configured to turn together with the knob, and a flange disposed around an outer peripheral surface of the rotary shaft. The flange is designed to regulate turning of the rotary shaft. The input device further includes an elastic component that is disposed around the outer peripheral surface of the rotary shaft and is fastened to the flange, a rotation controller that permits or inhibits turning of the elastic component, and a detector that detects a rotational state of the rotary shaft.

Input device

A lens actuator includes a carrier that is configured to retain a lens; a first AF coil that is disposed in the carrier while wound about an axis perpendicular to a lens retaining surface; first to fourth magnets that are disposed opposite the first AF coil in four directions parallel to the lens retaining surface; a first OIS coil that is disposed opposite the first magnet; and a second OIS coil that is disposed opposite the second magnet. A current is passed through the first AF coil to move the carrier in a vertical direction along an axis. The currents are passed through the first and second OIS coils to a movable unit in front-back and left-right directions. Therefore, weight reduction of the movable unit can be achieved to provide a lens actuator, in which electric power saving can be achieved.

Lens actuator

A trackball device including (i) a sphere, (ii) a support for rotatably supporting the sphere, (iii) a rotation detector for detecting rotation of the sphere, and (iv) a controller. The controller generates a specific output signal responsive to a signal from the rotation detector. The trackball device further includes an informer for generating auxiliary information that gives feedback of the situation to an operator according to how the sphere rotates. This structure can provide a trackball device having excellent user-friendliness. Because this trackball device gives feedback of the position of a pointer on a display to the operator, the operator doesn't have to look at the display. Thus, this trackball device is especially preferred for incorporation into a vehicle.

Trackball device and vehicle incorporating the same

A key management apparatus which can be used to encrypt/decrypt content data in a content playback device includes a storing unit for storing a secret key, a key information decrypting unit for decrypting encrypted key information and an updating unit operable to update the secret key with an algorithm stored therein, when the decrypted key information is key-updating information. Seed information can be received for use with the algorithm to provide a new secret key, and preliminary trigger information can be used to poll a group of appliances to request key information to determine any duplication of appliances.

Content playback apparatus method and program and key management apparatus and system

Provided is an elliptic curve exponentiation apparatus that can counter the DFA when an elliptic curve exponentiation technique is used. A computation result verification unitreceives, as a computation result, an exponentiation-result-point (X, Y) from an elliptic curve computation unitThe computation result verification unitcomputes X+a&#xd7;X+b, and computes Y, and outputs the received exponentiation-result-point when judging that Y=X+a&#xd7;X+b, and does not output the received exponentiation-result-point when not judging that Y=X+a&#xd7;X+b.

Elliptic curve exponentiation apparatus that can counter differential fault attack, and information security apparatus

The present invention provides a trackball and an in-vehicle device controller using the trackball. The trackball provides a stable operational feel and is easy to operate even in an environment in a vehicle where vibration and movement are present. The trackball includes a ball made of a non-magnetic material and having embedded therein bar members made of a magnetic material and arranged on three axes orthogonal to one another, a case enclosing the ball such that at least an upper portion of the ball is exposed, magnetic members fixed to the case on two axes penetrating through the center of the ball and orthogonal to each other so as to allow magnetic coupling to ends of the bar members, and another magnetic member fixed to the case on an axis penetrating through the center of the ball and orthogonal to the two axes so as to allow magnetic coupling to an end of one of the bar members.

Trackball and in-vehicle device controller using the trackball

In an exponentiation device, a relatively large table is generated outside of a coprocessor so as to enable high-speed exponentiation to be performed using the small window method. The selection of data from the table and transfer of data to the coprocessor are conducted in parallel with a multiple-length arithmetic operation performed in the coprocessor. So as to avoid bottlenecks occurring in the data transfer between a CPU and the coprocessor, two data banks are provided in the coprocessor for storing the data to be used in the arithmetic operation. By providing two banks in the coprocessor, it is possible to use one for transferring data while data stored in the other is being used in the arithmetic operation. When the operation using the stored data has been completed, the banks are switched, and the arithmetic operation is then repeated using the newly transferred data while at the same time conducting data transfer in readiness for the following operation.

Information security device, exponentiation device, modular exponentiation device, and elliptic curve exponentiation device

An information security device receives an input of prime q, and generates prime N that is larger than prime q. In the information security device, a partial information setting unit generates number u such that 2&#xd7;u&#xd7;q+1&#x2260;0 mod L(i=1, 2, . . . , n). A random number generating unit generates random number R'. A judgement target generating unit generates R=u+L&#xd7;L&#xd7; . . . &#xd7;L&#xd7;R&#x2032; and N=2&#xd7;R&#xd7;q+1, using number u and random number R&#x2032;. A primality judging unit judges the primality of number N, using numbers N and R generated by the judgement target generating unit.

Information security device, prime number generation device, and prime number generation method

An optical trackball device of the present invention includes a ball as an operating member, using a material that partially transmits light, and this ball is rotatably supported by a support member. Light emitted from a light emitter disposed beneath the ball is reflected on this ball. A detector detects the reflected light to identify rotation of the ball. Since the light from the light emitter is partially transmitted through the ball, the ball can be illuminated without providing an additional component. Accordingly, a location of the ball is easily recognizable even in a dark place.

Optical trackball device and electronic apparatus

A data usage controlling apparatus that reads a type 1 key from a storage unit and (a) main data, (b) a type 2 key that has been encrypted using the type 1 key, and (c) condition information that has been encrypted using the type 2 key from a recording medium, decrypts the condition information using the type 2 key, and controls usage of the read main data in accordance with the decrypted condition information. In accordance with usage of the main data, the decrypted condition information is updated, a new type 2 key is generated, and the stored type 1 key is updated. The updated condition information is encrypted using the new type 2 key and used to replace the encrypted condition information on the recording medium. The new type 2 key is encrypted using the updated type 1 key and used to replace the encrypted type 2 key on the recording medium.

Data usage controlling apparatus that prevents the unauthorized use of main data by updating a type 1 and a type 2 key used for protecting the main data in accordance with usage of the main data

A multi-word arithmetic device, capable of executing a variety of types of multi-word arithmetic required for elliptic curve cryptology, includes the following. A memory, formed from two dual-port memoriesand, temporarily stores n-word integers on which calculation is performed, and a calculation result. An arithmetic unitexecutes two or more types of calculation, including addition and multiplication, on each word, and outputs a one-word result. A memory input/output unitsupplies a maximum of three pieces of one-word data from the memoryto the arithmetic unit, while simultaneously storing a one-word calculation result from the arithmetic unitin the memory. A control unitcontrols the arithmetic unitand the memory input/output unitso as to have the arithmetic unit execute one of modular addition and Montgomery reduction on n words.

Multi-word arithmetic device for faster computation of cryptosystem calculations

In each digital content utilize session, a memory card generates conversion key information for specifying a data conversion, while a player generates inverse conversion key information for specifying an inverse data conversion. The memory card then performs the data conversion specified by the conversion key information on management information stored therein, and sends the converted management information and digital content stored therein to the player. The player performs the inverse data conversion specified by the inverse conversion key information on the converted management information to restore the management information, and utilizes the digital content in accordance with restrictions set in the restored management information to limit the use of the digital content.

DIGITAL DATA RECORDING DEVICE, DIGITAL DATA MEMORY DEVICE, AND DIGITAL DATA UTILIZING DEVICE FOR CONVERTING MANAGEMENT INFORMATION WHICH CONTAINS RESTRICTIVE INFORMATION USING A DIFFERENT KEY IN EACH MANAGEMENT INFORMATION SEND/RECEIVE SESSION

An exponent preprocessing unit preprocesses an n-bit exponent k and exponentiates a base A by the preprocessed exponent k. A bit string storing unit stores a bit string including a sign bit and the exponent k. A reading unit reads a bit pattern composed of the sign bit and a bit sequence made up of a predetermined number of bits. A bit pattern generating unit generates a new bit pattern from the read bit pattern. An operation pattern specifying unit specifies an operation pattern based on the read bit pattern. An operating unit performs an operation according to the specified operation pattern and writes the new bit pattern over the previous bit pattern. The reading unit reads a next bit sequence starting from a different bit in the bit string storing unit. A repeat controlling unit repeats these procedures n&plus;1 times.

Device, method, and storage medium for exponentiation and elliptic curve exponentiation

In a cryptography system, plaintext storage unit stores a plaintext. Encryption unit encrypts the plaintext to generate a ciphertext. First verification data generating unit generates first verification data, and second verification data generating unit generates second verification data. Decryption unit decrypts the ciphertext to generate a decrypted plaintext. First verification unit performs verification using the decrypted plaintext and the first verification data. Second verification unit performs verification using the first verification data, the ciphertext, and the second verification data. Display unit displays the results of the verifications.

ENCRYPTION DEVICE, DECRYPTION DEVICE, ENCRYPTION METHOD, DECRYPTION METHOD, CRYPTOGRAPHY SYSTEM, COMPUTER-READABLE RECORDING MEDIUM STORING ENCRYPTION PROGRAM, AND COMPUTER-READABLE RECORDING MEDIUM STORING DECRYPTION PROGRAM WHICH PERFORM ERROR DIAGNOSIS

A message receiving apparatus for receiving messages from a message transmitting apparatus generates first data for producing a display which urges a user of the message transmitting apparatus to input a message, and generates second data within the first data for specifying a conversion type for secret communication of the message. The message receiving apparatus sends the first data including the second data to the message transmitting apparatus and subsequently receives the message from the message transmitting apparatus. The message transmitting apparatus for transmitting messages to the message receiving apparatus receives the first data for producing the display and the accompanying second data for specifying the conversion type and produces the display according to the first data. On receiving the message inputted by the user in response to the display, the message transmitting apparatus converts the input message according to the second data and transmits the converted message to the message receiving apparatus.

Growing community of inventors

Aichi-ken, Japan

Takatoshi Ono