JP2000332745A5

JP2000332745A5 -

Info

Publication number: JP2000332745A5
Application number: JP1999140340A
Authority: JP
Filing date: 1999-05-20
Publication date: 2005-07-21
Anticipated expiration: 2019-05-20

Description

【００１６】
【課題を解決するための手段】
この発明に係る限定受信方式の送信装置は、秘匿化・多重化制御手段が多重化ビット列において、最大多重化遅延時間よりも大きな時間間隔でスクランブル鍵を更新するように制御するものである。 0016.
[Means for solving problems]
Transmitting device conditional access system according to the present invention, the concealment and multi duplexing control unit multiplexed bit stream, and controls to update the scramble key with a large time intervals than the maximum multiplexing delay time.

この発明に係る限定受信方式の送信装置は、パケット化・スクランブル手段がパケットの一部分を秘匿化するために使用したスクランブル鍵を格納するＥＣＭを特定するためのＥＣＭ特定番号をパケットのヘッダで通知するようにしたものである。 The conditional access transmission device according to the present invention notifies the ECM specific number for specifying the ECM that stores the scramble key used by the packetizing / scrambling means to conceal a part of the packet in the packet header. It is something like that.

この発明に係る限定受信方式の送信装置は、秘匿化・多重化制御手段が秘匿化についての優先度に基づいてパケットの秘匿特性を制御するようにしたものである。 Transmitting device conditional access system according to the invention is concealed and multi duplexing control means is adapted to control the concealment characteristics of the packets based on the priority of anonymity.

この発明に係る限定受信方式の送信装置は、秘匿化・多重化制御手段がコンテンツ毎の情報源符号化モード単位に設定された秘匿化についての優先度に基づいてパケットの秘匿特性を制御するようにしたものである。 Transmitting device conditional access system according to the present invention, ciphering and multi duplexing control means controls the concealment characteristics of the packets based on the priority of the anonymity set in source coding mode units for each content It is something like that.

この発明に係る限定受信方式の送信装置は、秘匿化・多重化制御手段が秘匿化についての優先度に基づき、暗号の種類、およびＣＢＣモードやＯＦＢモード等の暗号の利用モードを変えて暗号化するようにしたものである。 Transmitting device conditional access system according to the present invention, based on the priority of the concealment concealment and multi duplexing control unit, by changing the type of encryption, and the use mode of the CBC mode and OFB mode such cryptographic encryption It is intended to be transformed.

この発明に係る限定受信方式の送信装置は、秘匿化・多重化制御手段が秘匿化についての優先度に基づき秘匿化期間を制御するようにしたものである。
この発明に係る限定受信方式の送信装置は、多重化手段が、複数の情報源符号化ビット列を該情報源符号化ビット列毎に与えられた多重化遅延に基づく優先度に基づいてパケット単位に多重化して多重化ビット列を生成するようにしたものである。 Transmitting device conditional access system according to the invention is concealed and multi duplexing control means is adapted to control the ciphering period based on the preference for concealing.
In the transmission device of the limited reception method according to the present invention, the multiplexing means multiplexes a plurality of information source coded bit strings in packet units based on the priority based on the multiplexing delay given for each source coded bit string. It is designed to generate a multiplexed bit string.

【００７０】
【発明の効果】
以上のように、この発明によれば、秘匿化・多重化制御手段が多重化ビット列において最大多重化遅延時間よりも大きな時間間隔でスクランブル鍵を更新するように制御する構成としたので、受信側において古い鍵でスクランブルされたパケットと新しい鍵でスクランブルされたパケットとが混在するのが防止されるから、符号化ビット列の復号を確実に実施できて、限定受信方式における信頼性を高めることができるという効果を奏する。 [0070]
【Effect of the invention】
As described above, according to the present invention, since a configuration in which concealment and multi duplexing control means controls to update the scramble key with a large time intervals than the maximum multiplexing delay time in multiplexed bit sequence, reception Since it is prevented that packets scrambled with the old key and packets scrambled with the new key are mixed on the side, it is possible to reliably decrypt the encoded bit string and improve the reliability in the limited reception method. It has the effect of being able to do it.

この発明によれば、パケット化・スクランブル手段がパケットの一部分を秘匿化するために使用したスクランブル鍵を格納するＥＣＭを特定するためのＥＣＭ特定番号をパケットのヘッダで通知するように構成したので、当該パケットのスクランブル処理に使用されたスクランブル鍵を特定することができるから、古い鍵でスクランブルされたパケットと新しい鍵でスクランブルされたパケットとが受信側で混在しても符号化ビット列の復号を確実に実施できて、限定受信方式における信頼性を高めることができるという効果を奏する。 According to the present invention, the packetizing / scrambling means is configured to notify the ECM specific number for specifying the ECM for storing the scramble key used for concealing a part of the packet in the packet header. Since the scramble key used for scrambling the packet can be identified, the decryption of the coded bit string is ensured even if the packet scrambled with the old key and the packet scrambled with the new key are mixed on the receiving side. It has the effect of improving the reliability of the limited reception method.

この発明によれば、秘匿化・多重化制御手段が秘匿化についての優先度に基づいてパケットの秘匿特性を制御するように構成したので、各種コンテンツに応じて、あるいはコンテンツ毎の情報源符号化モードに応じて柔軟な秘匿特性を設定できるから、伝送するコンテンツの内容あるいは情報源符号化モードに応じた柔軟な秘匿機能を実現できるという効果を奏する。 According to the present invention, since the concealment and multi duplexing control unit is configured to control the concealment characteristics of the packets based on the priority for concealment, according to various content, or information source code of each content Since flexible concealment characteristics can be set according to the conversion mode, it is possible to realize a flexible concealment function according to the content of the content to be transmitted or the information source coding mode.

この発明によれば、秘匿化・多重化制御手段が秘匿化についての優先度に基づき、暗号の種類、およびＣＢＣモードやＯＦＢモード等の暗号の利用モードを変えて暗号化するように構成したので、コンテンツの内容または情報源符号化モード等に応じて秘匿の強度を適応的に制御することができるという効果を奏する。 According to the present invention, ciphering and multi duplexing control means based on the priority of concealment, type of encryption, and is configured to encrypt with different cipher modes of such CBC mode and OFB mode Therefore, there is an effect that the strength of concealment can be adaptively controlled according to the content or the information source coding mode.

この発明によれば、秘匿化・多重化制御手段が秘匿化についての優先度に基づき、秘匿化期間を制御するように構成したので、コンテンツの内容または情報源符号化モード等に応じて、一定の期間中、契約者のみ復号可能にすること、あるいは受信者すべてに復号可能にすること等を選別して実施することができるから、受信形態を柔軟に設定することができるという効果を奏する。 According to the invention, based on the priority of the concealment concealment and multi duplexing control unit, since it is configured to control the ciphering period, according to the content or source coding mode or the like of the content, Since it is possible to select and implement decipherability only for the contractor or decipherability for all the recipients during a certain period of time, it is possible to flexibly set the reception form. ..

Claims

Information source encoding means for encoding various contents;
Packetization and scramble means for storing an information source coded bit string output from the information source coding means in a packet and concealing a part of the packet to generate a packet string;
A multi-duplex unit that generates a multiplexed bit stream by multiplexing the packet unit a plurality of source coding bit string,
The transmitter as limited reception method and a concealment and multi duplexing control unit which controls the packetizing scrambling means and before Kio duplex unit,
The concealment and multi duplexing control means, in the multiplexed bit stream, the transmitting device of limited reception method and controls so than the maximum multiplexing delay time to update the scramble key with a large time interval.

2. The limited reception transmission apparatus according to claim 1, wherein the packetization / scramble means generates the variable length packet by storing the information source coded bit string in the payload of the variable length packet.

Information source encoding means for encoding various contents;
Packetization and scramble means for storing an information source coded bit string output from the information source coding means in a packet and concealing a part of the packet to generate a packet string;
A multi-duplex unit that generates a multiplexed bit stream by multiplexing the packet unit a plurality of source coding bit string,
The transmitter as limited reception method and a concealment and multi duplexing control unit which controls the packetizing scrambling means and before Kio duplex unit,
Transmission of a conditional access system characterized in that the packetization / scramble means notifies an ECM identification number for identifying an ECM storing a scramble key used for concealing a part of the packet by a packet header. apparatus.

4. The limited reception transmission apparatus according to claim 3, wherein the packetizing / scramble means generates the variable length packet by storing the information source coded bit string in the payload of the variable length packet.

And multiplex separating means you separates the multiplexed bit string multi duplex in a packet unit to the packet sequence for each content,
A packet decomposing / descrambling means for deciphering a concealed portion in the packet sequence and decomposing the packet to generate an information source encoded bit sequence;
In a reception apparatus of a limited reception system having an information source decoding unit that decodes an information source encoded bit string and reproduces content,
The packet disassembly / descrambling means refers to an ECM identification number, specifies a scramble key used to conceal a part of the packet, and releases the concealment of the concealed part of the packet. A receiving device of a receiving method.

Information source encoding means for encoding various contents;
Packetization / scramble means for storing an information source encoded bit string output from the information source encoding means in a packet and concealing a part of the packet;
A multi-duplex unit that generates a multiplexed bit stream by multiplexing the packet unit a plurality of source coding bit string,
The transmitter as limited reception method and a concealment and multi duplexing control unit which controls the packetizing scrambling means and before Kio duplex unit,
The concealment and multi duplexing control means, transmitting apparatus conditional access system and controlling the concealment characteristics of the packets based on the priority of anonymity.

Concealment and multi duplexing control means, limiting the claim 6, wherein the controlling the concealment characteristics of the packets based on the priority of the anonymity set in source coding mode units for each content A transmission device using a reception method.

Concealment and multi duplexing control unit, based on the priority of concealment, type of encryption, and claims 6 or, characterized in that encryption by changing the use mode of the CBC mode and OFB mode such encryption The transmission apparatus of the limited reception method according to claim 7.

Concealment and multi duplexing control unit, based on the priority of the concealment, the transmitter conditional access system according to claim 6 or claim 7, characterized in that controlling the ciphering period.

The limited reception according to any one of claims 6 to 9, wherein the packetization / scramble means generates the variable length packet by storing the information source coded bit string in the payload of the variable length packet. System transmitter.

The multiplexing means is characterized in that a plurality of information source encoded bit sequences are multiplexed in packet units based on a priority based on a multiplexing delay given for each information source encoded bit sequence, and a multiplexed bit sequence is generated. The transmission apparatus of the conditional access system according to claim 1, claim 3, or claim 6.