Cipher method and system for multicast service
    1.
    发明申请
    Cipher method and system for multicast service 审中-公开
    密码方式和组播业务系统

    公开(公告)号:US20070005958A1

    公开(公告)日:2007-01-04

    申请号:US11220587

    申请日:2005-09-08

    IPC分类号: H04L9/00

    摘要: A cipher method and system for multicast service. A group includes multiple user equipment, each having a respective key. The keys are orthogonal to one another. A content provider provides a raw message to the user equipment of the group. A BM-SC server has a key set composed of the respective keys of all user equipment of the group to encipher the raw message to thus obtain an enciphered message for broadcast. All user equipment of the group receives and deciphers the enciphered message with the respective keys. When a user equipment leaves the group, the key set held by BM-SC is updated by removing the key of the leaving user equipment.

    摘要翻译: 一种多播服务的密码方法和系统。 组包括多个用户设备,每个用户设备具有相应的密钥。 键彼此正交。 内容提供商向组的用户设备提供原始消息。 BM-SC服务器具有由组的所有用户设备的各个密钥组成的密钥组,以加密原始消息,从而获得用于广播的加密消息。 该组的所有用户设备都使用相应的密钥接收并解密加密的消息。 当用户设备离开组时,通过删除离开用户设备的密钥来更新由BM-SC保存的密钥集。

    Method for an OMA multimedia exchange
    2.
    发明申请
    Method for an OMA multimedia exchange 审中-公开
    OMA多媒体交换方法

    公开(公告)号:US20080091608A1

    公开(公告)日:2008-04-17

    申请号:US11785937

    申请日:2007-04-23

    IPC分类号: H04K1/00

    摘要: A method for an Open Mobile Alliance (OMA) multimedia exchange allows a sender to send a multimedia data to a receiver via a rights issuer. The method begins by registering to the rights issuer and sending a pubic key from the sender to the rights issuer. Next, a right object and a content object are sent from the sender to the rights issuer, wherein the right object records a content key encrypted by a private key of the sender. Then, the public key is used by the rights issuer to decrypt the content key, and the right object and the content object are packaged into a DRM content format (DCF) object. Finally, an OMA download is used over the Air (OMA download OTA) to send the DCF object from the rights issuer to the receiver.

    摘要翻译: 一种用于开放移动联盟(OMA)多媒体交换的方法允许发送者经由权利发行者向接收者发送多媒体数据。 该方法开始于向发行者注册并从发送方发送公钥到发行者。 接下来,将右对象和内容对象从发送方发送到权利发行者,其中权利对象记录由发送者的私钥加密的内容密钥。 然后,权限发行者使用公开密钥对内容密钥进行解密,将对象和内容对象打包成DRM内容格式(DCF)对象。 最后,通过Air(OMA下载OTA)使用OMA下载将DCF对象从发行者发送到接收方。