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1. 发明公开

EP1253762A1 Process for managing a symmetric key in a communication network and devices for the implementation of this process 审中-公开
标题翻译：用于在通信网络中管理的对称密钥和用于实施该方法的方法的装置
公开(公告)号：EP1253762A1
公开(公告)日：2002-10-30
申请号：EP02006985.2
申请日：2002-03-27
申请人： Thomson Licensing S.A.
发明人： Andreaux, Jean-Pierre , Diehl, Eric M. , Durand, Alain M.
IPC分类号： H04L29/06
CPC分类号： H04L63/0435 , H04L12/2803 , H04L63/0457 , H04L63/062 , H04N21/23476
摘要： The communication network comprises a device of a first type (1) furnished with a source of data to be broadcast over the network and at least one device of a second type (2) intended to receive the said data. The symmetric key management process comprises the following steps:

the source device (1) determines a first symmetric key (Kc) and transmits it securely (E1{PUB2}(Kc)) to at least one receiver device (2);
a receiver device (2) receives the first symmetric key (Kc), encrypts it (E2) with the aid of a second symmetric key (Kn), known to the receiver devices (2) of the network and transmits it to the source device;
the source device (1) recovers the encryption (E2{Kn}(Kc)) of the first symmetric key (Kc) and stores it.

Before transmitting the data (CW) to at least one reception device (2), the source device (1) encrypts (E3) these data with the aid of the first symmetric key (Kc), then it transmits these encrypted data (E3{Kc}(CW)), accompanied by the first encrypted symmetric key (E2{Kn}(Kc)), to at least one receiver device (2).
The receiver device (2) decrypts the first symmetric key (Kc) with the aid of the second key (Kn) which it possesses, then it decrypts the encrypted data with the aid of the first symmetric key thus recovered.
The invention also pertains to devices for implementing the process.
摘要翻译：所述通信网络包括配备有数据的源的第一类型（1）的装置将被广播通过网络和用于接收所述数据的第二类型（2）中的至少一个设备。对称密钥管理过程包括如下步骤：源设备（1）bestimmt一个第一对称密钥（KC），安全地发送它（E1äPUB2ü（KC））到至少一个接收机设备（2）; 接收机设备（2）接收第一对称密钥（KC），与第二对称密钥的帮助（KN），已知的接收器装置加密它（E2）（2）所述网络的，并将其发送到信源装置 ; 源装置（1）回收第一对称密钥（KC），并将其存储的加密（E2äKnü（KC））。与所述第一对称密钥（KC）的辅助数据（CW）发送到至少一个接收装置（2），源设备（1）加密（E3）合成数据之前，然后将其发送论文加密数据（E3äKcü（ CW））由所述第一加密的对称密钥（E2äKnü（KC））陪同到至少一个接收机设备（2）。接收机设备（2）解密所述第一对称密钥（KC）与所述第二密钥（Kn）的哪它具有，那么它解密与所述第一对称密钥的辅助下加密数据由此回收的帮助。因此，本发明涉及一种用于实施该方法的设备。

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