CN1353909A - 保障控制字安全的方法和设备 - Google Patents
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Abstract
按照本发明的一个实施例,提供了一种保障控制字安全的方法。这种方法包括在一个解扰器集成电路内接收加扰数字内容(42)。这种方法还包括在解扰器集成电路内接收一个加密控制字输入(41)、利用一个存储在解扰器集成电路的一个寄存器电路内的密钥对加密控制字解密(44)和在解扰器集成电路内利用经解密的控制字对加扰数字内容解扰(45)。
Description
互见相关申请
本申请要求享受1999年3月30日递交的美国临时申请U.S.No.60/126,805“保障控制字安全和降低机顶盒成本的方法”(“Method For Securing Control Words and Cost Reducing a SetTop Box”)的权益。
发明背景
1.发明领域
本发明与数字设备有关。具体地说,本发明涉及对数字设备内的数字内容进行解扰的设备和方法。
2.一般背景
模拟通信***正在迅速地为它们相应的数字通信***所代替。当前计划数字电视在2002年对美国所有用户开放,到2006年完全普及。在大多数主要城市已经开始在有限的基础上进行高清晰度电视(HDTV)广播。类似,互联网和万维网的蓬勃发展引起了可下载的诸如MP3格式音频文件之类的视听文件和其他内容的相应增长。
与迅速转向数字通信***的同时,部分也是由于数字通信***的迅速发展,在数字录取设备方面取得了重大的进展。通用数字盘片(DVD)刻录机、数字VHS盒式磁带录像机(D-VHS VCR)、CD-ROM刻录机(例如CD-R和CD-RW)、MP3录取设备和基于硬盘的记录设备这些都是有代表性的数字录取设备,能够进行高质量的录制和拷贝,而没有已知的在模拟情况下的逐代退化(即相继拷贝之间的质量变差)的问题。转向数字通信***和数字录取设备的发展势必使诸如电影和音乐产业之类的内容供应商特别关注防止有版权的或受保护的资料未经许可和不受控制拷贝的问题。
因此,诸如陆地广播、电缆和直接广播卫星(DBS)公司以及具有提供可下载内容的互联网站点的公司之类的业务经营方倾向引进一些保护方案。作为拷贝保护技术工作组(CPTWG)中工业委员会分组的数据隐蔽分组(DHSG)的5C组(5C组由Sony、Hitachi、Toshiba、Matsushita和Intel五个公司的代表组成)和数据传输讨论组(DTDG)已经提出两种这样的拷贝保护***。CPTWG代表了内容供应商、计算机和民用电子产品的制造厂家的利益。
DTDG的数字信息传输拷贝保护(DTCP)提案针对的是保护在通过诸如IEEE 1394串行总线之类的数字信息传输媒体连接的数字设备之间传输的拷贝受保护的数字内容。基于设备情况,这个提案采用对称密钥密码技术对应允设备的一些组件编码。这使得在传输数字内容前可以对任何数字设备进行验证,确定设备是否为应允的。数字内容本身在传输前加以编码,从而使非法拷贝内容只能得到格式难于理解的拷贝。
DHSG提出了一种基于水印技术的对内容编码的方法。虽然DHSG提案主要针对数字电影和录像内容的拷贝保护问题,特别是针对在应用于DVD***的情况,但是可以预料它也适用于通过数字广播和网络以电子方式分销的任何数字内容的拷贝保护。用户看不见的水印技术使得到的内容以一种极其难精确辨认内容怎样编码的方式标记,因此很难除去或改变水印而不破坏内容。DHSG确定了这样的技术应实现的三种主要的检测和控制情况:重放,录取和逐代拷贝的控制。可以预料,这种水印技术使内容供应商可以至少规定内容是“不准拷贝”、“一次拷贝”还是“自由拷贝”的。“不准拷贝”用来标记内容不允许拷贝的数字内容,而“自由拷贝”表明内容能自由拷贝,可以用辅助信息加以标记。这不同于不加标记的内容。最后,“一次拷贝”用来表明数字内容只允许拷贝一次。在进行拷贝时,原来的“一次拷贝”内容和新拷贝得的内容都用“不准拷贝”加以标记。当然,还有一些其他类型的拷贝管理命令可以限制播放或重放这样的数字内容,例如,限制播放或观看的具体时间、持续时间或次数。
因此,即使是今天,诸如机顶盒、数字电视、数字放音机之类的数字设备的功能也扩展到超出它们的历来的条件接入(CA)的范围,也就是超出了只是将内容去扰成一个供实时观看和/或收听的CA明文格式的范围,而现在还包括对录取和重放这样的数字内容的限制和条件。例如,当前通常通过适当的服务/内容供应商的授权或为数字设备提供密钥可以允许对以后需解扰再能观看或收听的加扰内容进行拷贝。
传统的用于收费电视的条件接入***源于不存在反向信道的单向广播***。例如,在诸如机顶盒之类的条件接入单元内的诸如智能卡之类的密码处理器通常灌注有自动许可接入节目的信息和功能。
例如,有着收费电视接入控制应用程序的智能卡通常接收一些许可享有某些特定服务的权利的EMM。一般,一些服务或组密钥同时传送,如果这个机顶盒允许观看IPPV节目,还可以发送信用和费消限制的信息。
在调谐到一个节目上时,智能卡接收一些描述智能卡许可接入这个节目所需的权利的ECM。黑客可以试图伪造EMM和ECM来观看节目而不支付必需的预订费。不仅是EMM和ECM可以伪造,而且硬件也可能受到攻击。对软件和硬件的一起攻击使智能卡可以对加扰的节目解密而不需要节目供应商的授权。
智能卡一旦就位,很难改变它的功能。一些向智能卡下载新的代码的机制也容易受到黑客的攻击,他们可以设法利用同样的机制将盗取的代码装入智能卡来偷看节目。一种对接入控制***进行升级的“安全”方式是取下现有的智能卡而换上新的智能卡。然而,这可能是不经济的,在逻辑上也是困难的。
发明概要
按照本发明的一个实施例,提供了一种保障控制字安全的方法。这种方法包括在一个解扰器集成电路内接收加扰数字内容。这种方法还包括:在解扰器集成电路内接收一个加密控制字,用一个存储在解扰器集成电路的一个寄存器电路内的密钥对这个加密控制字解密,以及在解扰器集成电路内用解密后的控制字对加扰数字内容进行解扰。
附图简要说明
本发明将结合附图以非限制性的例子进行说明。在这些附图中,同样的标注所指的是类似的构件,其中:
图1为采用本发明的数字设备的一个实施例的示范性娱乐***的方框图;
图2为有着智能卡的条件接入单元的实施例;
图3为安全地将控制字从智能卡传送给条件接入单元的方法的实施例;
图4和5为对数据加密和解密的方法的实施例;
图6为解扰器集成电路的实施例的方框图;
图7为数据转发服务器、网络连接和解码器的实施例;
图8为解码器的另一个实施例;
图9示出了一些可以为解码器或条件接入单元提供的服务的实施例;以及
图10示出了请求和接收控制字或服务密钥的方法的实施例。
详细说明
图1为采用了本发明的拷贝管理***的实施例的娱乐***100的方框图。娱乐***100包括一个从一个或多个服务供应商接收含有节目数据的数字比特流的数字设备110。这样的服务或内容供应商可以包括陆地广播公司、电缆广播公司、直接卫星广播(DBS)公司、通过互联网提供下载内容的公司或任何类似这样的内容和/或服务供应商。节目数据可以包括***信息、权利控制消息、权利管理消息、内容及其他数据,各简要说明如下。***信息可以包括有关节目名称、广播时间、信源、提取和解码的方法的信息,以及为数字接收机及其他设备提供控制怎样和什么时候可以重放、转发和/或录取节目数据的信息的拷贝管理命令。这些拷贝管理命令也可以和通常由条件接入单元用来控制对特定的信道或服务的接入的权利控制消息(ECM)一起发送。权利管理消息(EMM)可以用来将诸如权利、接入参数和解扰密钥之类的特许信息提供给数字接收机111。正如所知的那样,解密密钥通常为一个恢复加密数据所需的代码,可以随所授予的权利而改变。最后,节目数据流内的内容可以包括可以是加扰或明文格式的音频和视频数据。
数字设备110包括一个数字接收机111,用来处理输入比特流、从中提取节目数据和提供可观看格式的节目数据。数字设备110可以通过传输媒体120与娱乐***100内的其他组件连接。传输媒体120用来在数字设备110与娱乐***100内的其他组成部分之间传输控制信息和包括节目数据的数据。
娱乐***100可以包括一个与传输媒体120连接的音频***130。也可以通过传输媒体120将诸如D-VHS VCR之类的数字VCR 140与数字设备110和娱乐***100的其他组件连接。
也可以通过传输媒体120将硬盘记录设备150与数字设备110和其他组件连接。显示器160可以是一个高清晰度电视显示器、监视器或其他能处理数字视频信号的装置。最后,可以将控制器170与传输媒体120连接。控制单元170可以用来协调和控制娱乐***100的一些或各个组成部分。
数字节目的内容可以用加扰形式发送。为了使条件接入单元可以恢复加扰内容和使人可以观看明文形式的内容,该单元必须具有一些必要的与加扰内容关联的接入要求。接入要求包括说明条件接入单元为了对加扰内容解码必须具有的那些功能件的消息。例如,可能需要用某个密钥来观看该内容。或者,也可能需要一个与给定的内容供应商关联的服务标签。还可能需要诸如特定的去扰方法之类的技术要求,作为接入要求的一部分。与一个特定节目关联的接入要求可以与节目一起发送给条件接入单元。
在一个条件接入单元接收一个加扰节目时,要将这个节目的接入要求要与这个条件接入单元实际上所具有的权利相比较。为了使条件接入单元可以显示明文形式的加扰内容,节目的接入要求必须与条件接入单元的权利匹配。这些权利可以表明例如这个条件接入单元有资格观看来自诸如HBO之类的服务供应商的内容。权利还可以包括一个或多个对内容解扰所需的密钥。权利还可以规定条件接入单元可以对节目解扰的时间期限。因此,接入要求和权利形成接入控制***的确定一个解码器是否授权观看一个特定节目的一部分。
接入要求和权利可以为用户提供多种支付费用、获准接入加扰内容的选择。这些选择可以包括按播放支付(PPP)、按观看支付(PPV)、冲激式按观看支付(IPPV)、基于时间经历支付、按时间支付(PPT)、购回不准拷贝电影、个人加扰和区域性按观看支付。冲激式按观看支付的特点是允许通过以前下载入机顶盒的信用量购买按观看支付的电影。购买记录可以存储起来,通过电话转给计费中心。基于时间经历的允许接入在过去一段时间(例如1997年3月至12月)内传送的内容。接入要求和权利还可以为用户提供不同的存储加扰内容的选择权。
接入要求可以用一些分组标识符(PID)传送给条件接入单元。每个PID可以含有与一个给定的服务或性能关联的接入要求。传送给一个条件接入单元的内容也可以包括许多PID,因此使一些专用的计费功能、技术功能或其他专用功能可以在本机执行。
在发送内容前,可以给用户若干准予接入要存储到媒体上的内容的选择。可以要求用户购买接入和观看内容的权利。因此,如果用户想要录取内容以便以后恢复和观看,那么用户购买的接入要求也必需与内容一起存储起来。
用于条件接入单元的有一些不同类型的保安体系结构:1)植入式保安;2)分离式保安;以及3)外部保安。采用植入式保安,内容去扰和密钥管理都在诸如机顶盒之类的条件接入单元内执行。采用分离式保安,去扰在机顶盒内执行,但是密钥管理在机顶盒外用一个诸如智能卡之类的加密处理器执行。采用外部保安,内容去扰和密钥管理都在外部例如按NRSS-A和NRSS-B条件接入规范进行。电缆产业通过开放的电缆处理具有一个NRSS-B的修改版本,称为“部署点(Point-of-Deployment)”(POD)模块。POD模块具有与NRSS-B相同的形状因数。它包括在带外信道上发送和接收消息的功能。外部保安型也可以是分离型的,例如用一个PCMCIA形状因数的卡对内容解扰和用一个智能卡进行密钥管理。
此外,还可以对经CA解扰的传送流加以拷贝保护。拷贝受保护的内容将再通过CA模块(NRSS-A、NRSS-B或POD)接口和主机加扰。CA部件和主机需要商定对内容重新加密所用的密钥。在一个实施例中,在接口的两侧安全地共享各种参数,因此每一方得出相同的拷贝保护密钥。CA模块也可以得出它自己的密钥,用主机内解扰器集成电路的唯一密钥对拷贝保护密钥加密。CA模块可以通过EMM或其他方法(例如制造厂加载程序)接收到这个解扰器集成电路的唯一密钥。
如图2所示,具有本发明的拷贝管理***的数字接收机111的一个实施例包括一个智能卡接口420。虽然智能卡接口420可以建入数字接收机111内,但可以设想数字接收机有一个诸如PCMCIA槽或通用业务总线(USB)槽之类的扩展槽,用来接纳一个包括接口420的卡或装置。这个实施例的数字接收机111包括一个CPU 430和一个解扰器集成电路440。
智能卡接口420接受一个含有用于对加扰节目内容解扰的加密控制字的智能卡。智能卡410可以将这些控制字以加密形式发送给智能卡接口420。如果内容原先除密钥外还用控制字加扰,智能卡410可以利用单元401独有的一个加密控制密钥对控制字加密。条件接入单元401对控制字解密后,就用明文的控制字对节目内容解扰。
因此,图2示出了分离式保安体系结构和外部保安体系结构的一个实施例。在分离式保安体系结构中,条件接入单元401是一个机顶盒或其他类型的数字设备,诸如图1中所示的设备110。在外部保安体系结构中,条件接入单元401是一个NRSS-B条件接入单元。外部加密处理器410,例如诸如ISO 7816智能卡之类,接收对节目解扰所需的控制字(CW)。智能卡410在加密块414内用传送解扰器集成电路(IC)440独有的密钥对这些CW加密。
智能卡410将经加密的CW通过接口420传送给机顶CPU 430。机顶盒401内的传送解扰器IC 440用存储在寄存器450内的解扰器IC独有密钥对CW解密。然后,解密块460交替地将经解密的这些CW写入设置在传送解扰器芯片440内的解扰器470的ODD(奇)和EVEN(偶)密钥寄存器。解扰器470于是在适当时候将奇/偶CW加到加扰内容480上,输出经解扰的节目内容490。
因此,从智能卡到机顶盒的控制字传送是安全的,因为控制字是以加密形式传送的。控制字安全地保持在机顶盒内,因为控制字并不由非保安处理器430解密。控制字只是在实际使用控制字的解扰器IC440内解密,因此控制字决不会暴露,也就不可能被黑客获得。
此外,对控制字解密所用的密钥是以硬件形式存储在IC 440的寄存器450内。寄存器450不可能受到黑客的攻击,除非是用探针探测硅片,毁坏寄存器。可以用逐个穷举来试探存储在IC 440的寄存器450内的密钥。然而,如果密钥足够长,这种攻击措施可以认为是没有希望的。此外,这密钥可以只对一个特定的单元401有效,而其他单元不能用它来对控制字解密,因为控制字是由智能卡用一个所关联的条件接入单元401独有的密钥加密的。因此,加密控制字从智能卡410到条件接入单元401的传输是安全的,不容易被被黑客盗取。
保安芯片440执行控制字的所有保安处理。这个保安芯片没有CPU,没有固件,也没有软件。没有复杂的密钥体系。一个非基于CPU的解扰器芯片接收加密控制字,用一个唯一密钥予以解密。没有指令、代码、散列法和软件要装入解密块。解密完全由只用一个密钥函数的硬件电路执行。
这个唯一密钥可以在制造期间编程输入寄存器450。例如,在一个实施例中,解扰器IC有一个非易失性的只能写一次的唯一密钥寄存器450。在制造机顶盒、TV或NRSS-B模块401时,对唯一密钥寄存器450编程。在这个实施例中,没有办法读出或盖写装入寄存器450的原来密钥。可以将主机(401)的序号与装入这个主机的解扰器IC的唯一密钥之间的关联情况记录下来。
在制造机顶盒401和安装智能卡410时,智能卡410可以在配对的时候接收与单元401关联的唯一密钥。此后,智能卡就与特定的主机401配对。以后,如果智能卡410被置换或移到一个新的主机上,智能卡可以接收在权利管理消息(EMM)内的解扰器IC唯一密钥。也可以将新的带有已经编程输入的唯一密钥的智能卡交付给用户。
图3示出了一种将CW从智能卡传送到条件接入单元的方法。在步骤40,控制字在智能卡内用一个存储在智能卡的寄存器电路内的密钥加密。存储在智能卡的寄存器电路内的密钥与存储在解扰器集成电路的寄存器电路内的密钥是关联的。在步骤41,接收来自智能卡的加密控制字。这种方法包括在解扰器集成电路内接收一个含有节目数据的数字比特流的步骤42,节目数据包括***信息和加扰数字内容。在步骤44,加密控制字用一个存储在解扰器集成电路的寄存器电路内的密钥解密。在解扰器集成电路内用经解密的控制字对加扰数字内容解扰(步骤45)后,输出经解扰的数字内容(步骤46)。
图4、5和6示出了加密块414和解密块460执行的加密和解密的一些实施例。这些操作根据存储在寄存器412和450内的唯一密钥对CW进行变换。可以采用诸如DES、M6或DVB普通加扰算法之类的加密算法。在图4、5和6示出的这些实施例中,采用了三重DES。如图6所示,解扰器IC 440在解密块460内用三重DES对控制字解密。然后,经解密的控制字由解扰器470用来对节目内容480解扰,输出明文的节目内容490。
然而,由于CW的加密和解密对机顶盒来说是本机性的,因此有可能逐步部署越来越强健的加密。例如,可以最初部署单DES,而以后可以逐步采用二重或三重DES,这不影响已经上场的机顶盒和智能卡配对单元。唯一密钥的密钥长度至少可以达到象解扰控制字那样长,以减小黑客对唯一密钥攻击成功的可能性。
在如图7所示的另一个可供选择的实施例中,智能卡可以用一个单向或双向网络720的数据转发器710替代。数据转发器代替本机密码微型控制器维护解码器701的接入权利。数据转发器710可以根据存储在解扰器IC 740内的唯一密钥发给服务密钥。加密的服务密钥可以就地存储在主机701内,以便从一个信道转移到另一个信道。这些密钥以加密形式存储,在需要时装入解扰器IC 740。密钥只有在解扰器IC740内利用存储在寄存器750内的解扰器IC的唯一密钥解密。在一个实施例中,服务密钥直接用作对内容解密的控制字。在另一个实施例中,服务密钥用来对在带内与内容一起接收的控制字解密。
服务密钥可以是加密的,可以利用在上面描述的图2、4、5和6的实施例中对控制字所用的算法之一解密。用来对服务密钥加密和解密的算法可以与对节目内容加扰和解扰所用的算法不同。例如,M6用智能卡或数据转发器的密钥服务器内的软件执行比较容易。此外,每个服务密钥可以利用不同的公开和专有的加密算法进行加密。这些不同的专有算法可以被认为是使克隆硬件无效的防盗措施。
数据转发器710可以通过一个信道或EMM内基本服务等级传送服务密钥。服务密钥加密后就地存储在解码器401内,在调谐到不同的信道时由非保安处理器730按需要使用。由于机顶盒与数据转发器相比装备量要高得多,因此机顶盒中省去诸如智能卡之类的密码处理器可以大大降低在一个网络内实现一个收费电视***的成本。
虽然这个实施例在单向(非IPPV)广播网内工作,但是它也可以在双向、交互型网内实现,在这种网内请求特定服务的密钥,诸如购买IPPV或VOD或任何其他非预订性的服务。返回信道721请求密钥,因为同意接入新的业务的权限由数据转发器710实施而不是在本机进行控制的密码处理器。
为了避免由于有许多用户同时购买IPPV节目所引起的数据转发器超载问题,可以确定一个免费预览期,将IPPV节目在实际观看前投放市场。在这个实施例中,各个节目或电影的服务密钥可以由单元701请求,提前传送。例如,诸如具有一个例如DOCSIS或带外发射机/接收机的电缆***的交互型网络可以从单元701向数据转发器710传送这种请求。或者,机顶盒单元701也可以请求每个要接入的节目的当前解密服务密钥。
在网络数据转发服务器710处的控制器处理这种对节目密钥的请求(RPK)。这种请求可以含有解码器的单元地址和标识要观看的信道所需的信息(所有可以从MPEG***获得的和节目信息已经由非保安处理器处理)。这种请求如果必要的话可以加密,以保证支付和防止否认受到服务,例如IPPV或VOD请求。
收到这个消息后,密钥服务器710就在接入控制表(列有每个单元的权利)中查出解码器701,验证解码器的权限。如果是授权的,控制器就将服务密钥(用位于解扰器IC的解码器唯一密钥加密)发送给这个单元。图8示出了可以请求和接收服务密钥的解码器701的一个可供选择的实施例。
在这个实施例中,服务密钥可以是对于一定的时间段有效的。解码器701可以在浏览其他服务时将这个密钥存储起来,这允许解码器用仍然有效的密钥重新接入这个服务而不需要再次请求密钥。在这个实施例中,密钥以它的单元的专用加密形式(就好象它由密钥服务器通过网络发来的)存储在运行解码器的非保安处理器730的存储器735内。
由于所用的是非保安的通用主机处理器的存储器和处理能力而不是一个独立的密码处理器,因此大大地降低了成本。不仅可以省去密码处理器,而且主机处理器在处理作为密码处理器的通信上的总开销也是很小的。
服务密钥可以是在节目的持续时间内有效,也可以是在一段时间(例如6小时)内有效。使用较长时间的密钥将减少在解码器701与数据转发器710之间的事务,因为一旦密钥存储在解码器701内,以后解码器就可以从解码器的存储器读出密钥。根据当前服务密钥的持续时间,下一个密钥可以与当前密钥一起提供。或者,解码器也可以在检测到当前服务密钥的有效时期的末尾后请求下一个服务密钥。在一个实施例中,服务密钥在用户的预订期限内有效。
服务密钥必须予以适当标识,使它可以用于要调谐的信道。在机顶盒701调谐到一个信道上时,它从存储器735内查出适当的加密服务密钥写入解扰器IC 740的奇/偶MPEG密钥寄存器。如在图2的实施例中那样,秘密的唯一密钥信息可以在制造解码器701时编程输入IC740。
在一个实施例中,服务密钥可以包括56比特、112比特或168比特密钥。表1示出了对于不同的密钥长度的存储要求。
表1:存储独立的服务密钥的字节数
具有独立密钥的信道数 | 信道ID(3字节) | 16字节的三重DES加密的服务密钥 | 16字节的三重DES加密的服务密钥 | 总字节数 |
当前 | 下个 | |||
20 | 60 | 320 | 320 | 700 |
50 | 150 | 800 | 800 | 1,750 |
100 | 300 | 1600 | 1600 | 3,500 |
200 | 600 | 3200 | 3200 | 7,000 |
400 | 1200 | 6400 | 6400 | 14,000 |
服务可以按节目单销售或按节目组销售。可以有若干服务等级。例如,可以有基本服务等级、提供较多服务的中等服务等级和提供不同优质服务的高等服务等级,如图9所示。在这个实施例中,每个服务等级可以给有一个独立的密钥。
从上面的表1可见,如果一个用户预订了一些服务等级的20个不同的类型,那就需要有60个字节存储ID、320个字节存储当前有效服务密钥、320个字节存储下一个时期(或计费期)有效的服务密钥,总共需要700个字节。
通常,ECM需要将接入一个信道所需的接入条件与这个信道或服务ID信息和控制字(密钥)的信息一起传送。在这个实施例中,ECM可以简化。需要纳入ECM的只有信道或服务ID信息,可能还有节目ID,如果是IPPV或VOD节目的话。这是因为不需要执行除了识别来自存储器的适当加密密钥和将它写入解扰器IC的适当寄存器之外的ECM处理。
图10示出了一种请求和接收服务密钥的方法的实施例。在步骤1010和1015,从数据转发器不断地向解码器发送节目信息。然后,在步骤1020,有一个观众选择一个要观看的信道,在步骤1025,解码器向数据转发器请求一个服务密钥。在步骤1030,数据转发器检验解码器的预订状态。如果这个解码器是预订的,就在步骤1055,数据转发器向解码器提供服务密钥。而如果这个解码器不是预订的,就在步骤1035,解码器要求这个观众进行预订。在步骤1040,观众决定预订。在步骤1045,解码器向数据转发器发送一个要购买的请求。在步骤l050,数据转发器向解码器发送一个加密的服务密钥。
因此,在这个实施例中,解码器包括一个有着一个唯一密钥的解扰器IC。服务密钥用解扰器IC唯一密钥加密后传送给解码器701,以加密形式存储在解码器内。或者,也可以是解码器在本机没有存储服务密钥的情况下每当调谐到一个信道上时请求一个服务密钥。通常由保安密码处理器保存的权利由控制机构(例如数据转发器内的密钥服务器)保存。解码器701内的非保安处理器730可以接收一个告诉它授权解扰的是什么的消息(例如一个ECM或EMM),使它可以适当地向观众显示可观看的选项。处理器730于是可以请求所选信道的服务密钥。在这个实施例中,没有植入的“保安”固件或软件。由于使用了上述的的硬件解密电路,就不需要一个执行加密功能13的植入CPU的内核或固件。这使一些条件接入应用可以下载给非保安处理器。服务密钥是加密的单元密钥。它可以是一个公开的非对称密钥或秘密的对称密钥。
其他的一些优点包括不需要使用由一个具有一个有着以硬件植入的唯一密钥的解扰器IC的解码器提供的密码处理器的收费电视应用。解码器可以向网络供应商请求服务密钥或控制字。本机接入控制可以由非保安处理器执行,因为关键性的“保安”功能隔离在解扰器IC内。
在以上说明中,本发明是结合一些具体的示范性实施例进行说明的。然而,在不背离如在所附权利要求书中所提出的更为明确的本发明的精神和范围内显然可以对这些实施例进行各种修改和替换。因此,本说明书和这些附图都是说明性的而不是限制性的。
Claims (33)
1一种对数字内容去扰的方法,所述方法包括:
在一个解扰器集成电路内接收加扰数字内容;
在解扰器集成电路内接收一个加密控制字;
利用一个存储在解扰器集成电路内的密钥对加密控制字解密;以及
在解扰器集成电路内利用经解密的控制字对加扰数字内容解扰。
2.权利要求1的方法,其中所述数字内容是包含在一个电视传输内的内容。
3.权利要求1的方法,其中所述数字内容是从互联网下载的内容。
4.权利要求1的方法,其中所述控制字利用三重DES解密。
5.权利要求1的方法,其中所述加密控制字是从一个智能卡接收的。
6.权利要求5的方法,所述方法还包括在智能卡内利用一个存储在智能卡的一个寄存器电路内的密钥对所述控制字加密,其中存储在智能卡的寄存器电路内的密钥与存储在解扰器集成电路的寄存器电路内的密钥关联。
7.权利要求1的方法,其中所述加密控制字是从一个通过一个网络与解扰器集成电路连接的控制实体接收的。
8.权利要求7的方法,其中所述控制实体是从包括数据转发服务器、上行链路和广播电台的组中选出的。
9.权利要求7的方法,其中所述控制字由控制实体利用一个与存储在解扰器集成电路的寄存器电路内的密钥关联的密钥加密。
10.权利要求1的方法,其中所述加密控制字是从一个模块接收的。
11.权利要求10的方法,其中所述模块是从包括NRSS-A模块、NRSS-B模块、POD模块和其他CA部件的组中选出的。
12.一种对数字内容解扰的设备,所述设备包括:
在一个解扰器集成电路内接收加扰数字内容的装置;
在解扰器集成电路内接收一个加密控制字的装置;
利用一个存储在解扰器集成电路内的密钥对加密控制字解密的装置;以及
在解扰器集成电路内利用经解密的控制字对加扰数字内容解扰的装置。
13.权利要求12的设备,其中所述数字内容是包含在一个电视传输内的内容。
14.权利要求12的设备,其中所述数字内容是从互联网下载的内容。
15.权利要求12的设备,其中所述控制字利用三重DES解密。
16.权利要求12的设备,其中所述加密控制字是从一个智能卡接收的。
17.权利要求16的设备,所述设备还包括在智能卡内利用一个存储在智能卡的一个寄存器电路内的密钥对控制字加密,其中存储在智能卡的寄存器电路内的密钥与存储在解扰器集成电路的寄存器电路内的密钥关联。
18.权利要求12的设备,其中所述加密控制字是从一个通过一个网络与解扰器集成电路连接的控制实体接收的。
19.权利要求18的设备,其中所述控制实体是从包括数据转发服务器、上行链路和广播电台的组中选出的。
20.权利要求12的设备,其中所述控制字由控制实体利用一个与存储在解扰器集成电路的寄存器电路内的密钥关联的密钥加密。
21.权利要求20的设备,其中所述加密控制字是从一个模块接收的。
22.权利要求18的设备,其中所述模块是从包括NRSS-A模块、NRSS-B模块、POD模块和其他CA部件的组中选出的。
23.一种对数字内容解扰的设备,所述设备包括:
一个解扰器集成电路;
一个在解扰器集成电路内接收加扰数字内容和在解扰器集成电路内接收加密控制字的接收器;
一个利用一个存储在解扰器集成电路内的密钥对加密控制字解密的解密器;以及
一个在所述解扰器集成电路内利用经解密的控制字对加扰数字内容解扰的解扰器。
24.权利要求23的设备,其中所述数字内容是包含在一个电视传输内的内容。
25.权利要求23的设备,其中所述数字内容是从互联网下载的内容。
26.权利要求23的设备,其中所述控制字利用三重DES解密。
27.权利要求23的设备,其中所述加密控制字是从一个智能卡接收的。
28.权利要求27的设备,所述设备还包括在智能卡内利用一个存储在智能卡的一个寄存器电路内的密钥对控制字加密,其中存储在智能卡的寄存器电路内的密钥与存储在解扰器集成电路的寄存器电路内的密钥关联。
29.权利要求23的设备,其中所述加密控制字是从一个通过一个网络与解扰器集成电路连接的控制实体接收的。
30.权利要求29的设备,其中所述控制字由控制实体利用一个与存储在解扰器集成电路的寄存器电路内的密钥关联的密钥加密。
31.权利要求23的设备,其中所述加密控制字是从一个模块接收的。
32.权利要求31的设备,其中所述模块是从包括NRSS-A模块、NRSS-B模块、POD模块和其他CA部件的组中选出的。
33.权利要求29的设备,其中所述控制实体是从包括数据转发服务器、上行链路和广播电台的组中选出的。
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PCT/US2000/005111 WO2000059222A1 (en) | 1999-03-30 | 2000-02-29 | Method and apparatus for securing control words |
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CNB008083061A Expired - Lifetime CN100361529C (zh) | 1999-03-30 | 2000-02-29 | 保障控制字安全的方法和设备 |
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CN (1) | CN100361529C (zh) |
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AU (1) | AU3505700A (zh) |
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- 2000-02-29 JP JP2000608608A patent/JP4991051B2/ja not_active Expired - Lifetime
- 2000-02-29 AT AT00913651T patent/ATE268973T1/de not_active IP Right Cessation
- 2000-02-29 KR KR1020017012383A patent/KR100735761B1/ko active IP Right Grant
- 2000-02-29 AU AU35057/00A patent/AU3505700A/en not_active Abandoned
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2004
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2007
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101019427B (zh) * | 2004-09-16 | 2010-11-03 | 通用仪表公司 | 提供对数字内容授权访问的***和方法 |
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CN101827246A (zh) * | 2009-02-13 | 2010-09-08 | 耶德托存取公司 | 从智能卡向有条件访问模块安全提供控制字 |
CN107734389A (zh) * | 2017-10-31 | 2018-02-23 | 成都德芯数字科技股份有限公司 | 信息处理方法及数字接收设备 |
Also Published As
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WO2000059222A1 (en) | 2000-10-05 |
ATE268973T1 (de) | 2004-06-15 |
US20100235624A1 (en) | 2010-09-16 |
JP4991051B2 (ja) | 2012-08-01 |
US20040151314A1 (en) | 2004-08-05 |
US20150312525A1 (en) | 2015-10-29 |
CN100361529C (zh) | 2008-01-09 |
US8533459B2 (en) | 2013-09-10 |
DE60011405D1 (de) | 2004-07-15 |
US9467658B2 (en) | 2016-10-11 |
KR20010110715A (ko) | 2001-12-13 |
US9210382B2 (en) | 2015-12-08 |
US20130322625A1 (en) | 2013-12-05 |
US7302058B2 (en) | 2007-11-27 |
AU3505700A (en) | 2000-10-16 |
EP1163798B1 (en) | 2004-06-09 |
US7925016B2 (en) | 2011-04-12 |
US6697489B1 (en) | 2004-02-24 |
JP2002540736A (ja) | 2002-11-26 |
EP1163798A1 (en) | 2001-12-19 |
DE60011405T2 (de) | 2005-06-16 |
KR100735761B1 (ko) | 2007-07-06 |
US20100020963A1 (en) | 2010-01-28 |
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