摘要:
To easily ensure that appropriate recognition information is used. A remote control system (1) includes a DVR (13) and a remote control (11) that controls the DVR (13) via a wireless communication path. The remote control (11) which is one apparatus out of the DVR (13) and the remote control (11) obtains, by a wireless reception unit (114), recognition information used by the apparatus to uniquely recognize the other apparatus, via another communication path (a communication path through a TV (12)) different from the wireless communication path connecting the apparatus and the other apparatus. When a connected apparatus recognized via the wireless communication path is identified by the obtained recognition information, the remote control (11) sets, by a control circuit (115), the connected apparatus as the DVR (13) which is the other apparatus to enable communication with the connected apparatus.
摘要:
To easily ensure that appropriate recognition information is used. A remote control system (1) includes a DVR (13) and a remote control (11) that controls the DVR (13) via a wireless communication path. The remote control (11) which is one apparatus out of the DVR (13) and the remote control (11) obtains, by a wireless reception unit (114), recognition information used by the apparatus to uniquely recognize the other apparatus, via another communication path (a communication path through a TV (12)) different from the wireless communication path connecting the apparatus and the other apparatus. When a connected apparatus recognized via the wireless communication path is identified by the obtained recognition information, the remote control (11) sets, by a control circuit (115), the connected apparatus as the DVR (13) which is the other apparatus to enable communication with the connected apparatus.
摘要:
A communication apparatus includes: a memory (418) that holds CA information A (301a) including (ú@) a CA certificate A (106a) indicating that an AP server certificate A (402a) that indicates the validity of an application server (401) is valid and (úA) a URL B (302b) indicating the URL of a download server B (406b) where CA information B (301b) including the next valid CA certificate B (106b) is stored; a server authentication unit (416) that verifies the AP server certificate A (402a) using the CA certificate A (106a); and a CA information update unit (417) that obtains the CA information B (301b) from the download server B (406b) indicated by the URL B (302b), wherein when the CA certificate A (106a) becomes revoked, the server authentication unit (416) thereafter authenticates the application server (401) using the CA certificate B (106b) included in the CA information B (301b) obtained by the CA information update unit (417).
摘要:
A communication apparatus with a memory (418) holding CA information A(301a) including (i) a CA certificate A(106a) indicating that an AP server certificate A(402a) (that indicates the validity of an application server (401)) is valid and (ii) a URL B(302b) indicating the URL of a download server B(406b) where CA information B(301b) including the next valid CA certificate B(106b) is stored. The communication apparatus also having a server authentication unit (416) verifying the AP server certificate A(402a) using the CA certificate A(106a), and having a CA information update unit (417) obtaining the CA information B(301b) from the download server B(406b) indicated by the URL B(302b), wherein, when the CA certificate A(106a) becomes revoked, the server authentication unit (416) authenticates the application server (401) using the CA certificate B(106b) included in the CA information B(301b) obtained by the CA information update unit (417).
摘要:
A transmission device, which continues consistent secure communication, even if a frame counter is reset due to a power cut off, includes a transmission frame counter that counts a value monotonically incremented for each packet transmission and holds the value as a frame counter value. The transmission device includes a transmission unit that adds the frame counter value held in the transmission frame counter to a packet, and transmits the packet to the reception device, and a storage circuit that stores the frame counter value. The transmission frame counter (i) stores the counted and held frame counter value into the storage circuit for each stored-frame-counter updating increment that is a natural number greater than an increment by which the frame counter value is monotonically incremented, and holds, as a new frame counter value, the stored frame counter value added with the stored-frame-counter updating increment, when the transmission device is reset.
摘要:
An apparatus for recording and reproducing digital data according to the present invention, includes: a group converter; a controller; a recording converter; a recording unit; a reproducing unit; a reproducing converter; and a group reverse converter, wherein the group converter includes: a block management data generator for receiving the management data from the controller and generating block management data with respect to the corresponding blocked data, the block management data having a variable-length and containing information concerning each blocked data; a group management data generator for receiving the management data and generating group management data containing information concerning the entire grouped data; and a grouped data generator for receiving the blocked data, the block management data, and the group management data, and generating grouped data by arranging the blocked data, the block management data, and the group management data in a predetermined order.
摘要:
A method for transmitting data when a system detects the amount of data which can be transferred, and divides the data to be transferred into a plurality of data blocks to form a list. A transfer device refers to the list and carries out input and output processing between a VTR or a network and a memory. Thus, the data can be efficiently transmitted at high speed with high reliability and independent of system configuration. Additionally, the data can be rearranged in the course of its transmission.
摘要:
Input digital data are formatted into a data block composed of a predetermined amount of data, subjected to error correction encoding process, and recorded on a predetermined number of continuous tracks of a recording medium. In the error correction encoding process, the data block is subjected to an inter-track error correction encoding, an outer error correction encoding and an inner error correction encoding. In the inter-track error correction encoding, each information element to be coded is produced by symbols collected from the data which are to be recorded on different tracks of the continuous tracks. The error correction encoded data in the data block are distributed to a first predetermined recording area of each track of the continuous tracks, and parity code words produced by the inter-track error correction encoding are distributed to a second predetermined recording area of each track of the continuous tracks.
摘要:
A transmission device can continue secure communication having a consistency between a frame counter of a transmission device and a frame counter of a reception device without bothering a user, even if the frame counter is reset due to battery exchange, power cut off, or the like. The transmission device includes: a transmission frame counter (20) that counts a value monotonically incremented for each packet transmission and holds the value as a frame counter value; a transmission unit that adds the frame counter value held in the transmission frame counter (20) to a packet, and transmits the packet to the reception device (200); and a transmission frame counter storage circuit (23) that stores the frame counter value. The transmission frame counter (20) (i) stores the counted and held frame counter value into the transmission frame counter storage circuit (23) for each stored-frame-counter updating increment that is a natural number greater than an increment by which the frame counter value is monotonically incremented, and (ii) holds, as a new frame counter value, the frame counter value stored in the transmission frame counter storage circuit (23) added with the stored-frame-counter updating increment, when the transmission device (100) is reset.
摘要:
A communication system includes a device and a server connected to the Internet, which transfers communications between the device and a terminal connectable to the Internet via the server. The device periodically transmits a notice packet to the server. The server transmits a connection request packet to the device in reply to the notice packet when a transfer to the device is requested from the terminal. The device transmits a TCP connection request to the server when receiving the connection request packet from the server. The server accepts the TCP connection request transmitted from the device to the server in reply to the connection request packet, to establish the TCP connection. Thus, the server transfers communications between the terminal and the device on the TCP connection after the TCP connection is established.