Preventing replay attacks on digital information distributed by network
service providers
    9.
    发明授权
    Preventing replay attacks on digital information distributed by network service providers 失效
    防止网络服务提供商分发的数字信息的重播攻击

    公开(公告)号:US6005938A

    公开(公告)日:1999-12-21

    申请号:US767535

    申请日:1996-12-16

    摘要: A technique for preventing replay attacks on digital information distributed by network service providers. At the beginning of a subscription period for a service, a network service provider sends entitlement messages to the subscriber which provide the subscriber for the service with a session key and authorization information. The authorization information specifies a service and a period of time. When an encrypted instance of a service is distributed on the network, it is accompanied by a series of entitlement control messages. Each of the messages includes a value which can be used with the session key to obtain a control word for decrypting the encrypted instance and a time specifier. The subscriber equipment which decrypts the instance of the service does so only if the time specifier in the entitlement control message specifies a time within the time period specified by the authorization information.

    摘要翻译: 一种防止网络服务提供商分发的数字信息的重放攻击的技术。 在服务的订阅周期开始时,网络服务提供商向订户发送授权消息,为订户提供会话密钥和授权信息。 授权信息指定服务和一段时间。 当服务的加密实例在网络上分发时,伴随着一系列授权控制消息。 每个消息包括可以与会话密钥一起使用以获得用于解密加密实例的控制字和时间说明符的值。 仅当授权控制消息中的时间指定者在授权信息指定的时间段内指定时间时,解密服务实例的用户设备才会这样做。

    Configuration of presentations of selectable TV services according to usage
    10.
    发明授权
    Configuration of presentations of selectable TV services according to usage 有权
    根据用途配置可选电视服务

    公开(公告)号:US08739212B2

    公开(公告)日:2014-05-27

    申请号:US13596689

    申请日:2012-08-28

    IPC分类号: H04N5/445

    摘要: The present invention provides a method and system for accessing services in a television system. In one implementation, a DHCT presents a user a menu containing a plurality of selectable link representations corresponding to separate services or applications offered by the cable television system. The user navigates the menu with a remote device and selects a desired service by choosing the selectable link representation corresponding to the desired service or application. The DHCT receives the user input, translates the selectable link command into an executable call, and activates the service or application corresponding to the selected link representation from the menu chosen by the user.

    摘要翻译: 本发明提供一种用于在电视系统中访问服务的方法和系统。 在一个实现中,DHCT向用户呈现包含对应于由有线电视系统提供的单独的服务或应用的多个可选择链接表示的菜单。 用户使用远程设备导航菜单,并通过选择与期望的服务或应用相对应的可选择链接表示来选择期望的服务。 DHCT接收用户输入,将可选择的链接命令转换成可执行的呼叫,并从用户选择的菜单中激活与所选择的链接表示相对应的服务或应用。