Abstract: A portable device includes an acceleration sensor capable of detecting accelerations in three-axis directions. When a GPS radio wave is receivable by a GPS module, the portable device stores, using an MCU, a correlation between a body vibration frequency detected by the acceleration sensor and speed information grasped by processing a signal included in the GPS radio wave in a flash ROM. When a reception state of the GPS radio wave does not satisfy a predetermined standard, the portable device estimates running speed using the MCU on the basis of the body vibration frequency detected by the acceleration sensor 38 and the correlation stored in the flash ROM.

Abstract: An audio data processing device including: a first processor; and a second processor which is connected to the first processor wherein the first processor includes: an audio data acquisition which acquires audio data of digital data; an omitting section which omits a bit corresponding to low volume which is hard to be heard by human ears from the audio data; and a transmitter which transmits the audio data in which the bit corresponding to the low volume is omitted by the omitting section from the first processor to the second processor; wherein the second processor includes: a receiver which receives the audio data transmitted from the first processor; and a reproduction data generator which generates audio reproduction data necessary to reproduce the audio data based on the received audio data.

Abstract: A personal identity authenticating system where the registrant/cardholder and the registrar are assigned specific identifiers and secret keys and public keys that are mapped to the identifiers at the authentication support station (ASS). Personal identity to which the registrar identifier is attached is encrypted wit the registrant/cardholder's secret key. Personal identity data is embedded as an encrypted watermark image data by means of the registrar's secret key. Both encrypted identity and watermarked image data are recorded on the IC card. When authentication is required, the identity data with the registrar identifier is decrypted with the cardholder's public key that is supplied by the ASS. The registrar's public key is obtained from the ASS by using the decrypted registrar identifier. The registrar's public key permits the personal identity to be retrieved from the watermarked image data. Internal authentication is executed by matching between personal identity strings and image data.

Abstract: In step S101, an electrical signal output from an CCD is converted into a digital signal. In step S103, digital data output from an analog-to-digital converter are recorded in RAM. In step S104, the data recorded on RAM are subjected to various image correction. In steps S105 through S110, the data corrected in step S104 are compressed in accordance with a JPEG compression scheme. In step S106, there is determined a location in which characteristic data are to be embedded. In step S107, characteristic data are produced from image data. In step S108, encrypted data are formed by encrypting characteristic data. In step S109, encrypted characteristic data are embedded into image data.

Abstract: A personal identity authenticating system where the registrant/cardholder and the registrar are assigned specific identifiers and secret keys and public keys that are mapped to the identifiers at the authentication support station (ASS). Personal identity to which the registrar identifier is attached is encrypted wit the registrant/cardholder's secret key. Personal identity data is embedded as an encrypted watermark image data by means of the registrar's secret key. Both encrypted identity and watermarked image data are recorded on the IC card. When authentication is required, the identity data with the registrar identifier is decrypted with the cardholder's public key that is supplied by the ASS. The registrar's public key is obtained from the ASS by using the decrypted registrar identifier. The registrar's public key permits the personal identity to be retrieved from the watermarked image data. Internal authentication is executed by matching between personal identity strings and image data.

Abstract: An audio data processing device disclosed herein comprises: a first processor; and a second processor which is connected to the first processor, wherein the first processor comprises: an audio data acquisition which acquires audio data of digital data; an omitting section which omits a bit corresponding to low volume which is hard to be heard by human ears from the audio data; and a transmitter which transmits the audio data in which the bit corresponding to the low volume is omitted by the omitting section from the first processor to the second processor; wherein the second processor comprises: a receiver which receives the audio data transmitted from the first processor; and a reproduction data generator which generates audio reproduction data necessary to reproduce the audio data based on the received audio data.

Abstract: A personal identity authenticating system where the registrant/cardholder and the registrar are assigned specific identifiers and secret keys and public keys that are mapped to the identifiers at the authentication support station (ASS). Personal identity to which the registrar identifier is attached is encrypted with the registrant/cardholder's secret key. Personal identity data is embedded as an encrypted watermark image data by means of the registrar's secret key. Both encrypted identity and watermarked image data are recorded on the IC card. When authentication is required, the identity data with the registrar identifier is decrypted with the cardholder's public key that is supplied by the ASS. The registrar's public key is obtained from the ASS by using the decrypted registrar identifier. The registrar's public key permits the personal identity to be retrieved from the watermarked image data. Internal authentication is executed by matching between personal identity strings and image data.

Abstract: Conventional credit cards are exposed to risks that someone else signs in imitation of the signature of the cardholder or counterfeits the card, which is relatively easy to do. By the disclosed invention, a personal identity authenticating system of extremely high security for payment with an IC card or the like can be built. The registrant/cardholder and the registrar are assigned their specific identifiers and their secret keys and public keys are managed, mapped to the identifiers at the authentication support station (ASS). Personal identity to which the registrar identifier is attached is encrypted with the registrant/cardholder's secret key. In addition, personal identity is embedded as an encrypted digital watermark into image data by means of the registrar's secret key. Both encrypted identity data and watermarked image data are recorded on the IC card.