标题: 有线电视系统中对于频道保护的金匙分配方法
Key Distribution Schemes for Channel Protection on Pay-TV Systems
作者: 王坚权
Wang, Jian-Chyuan
谢续平
Shiuh-Pyng Shieh
资讯科学与工程研究所
关键字: 有线电视系统;频道保护;搅乱器;智慧卡;Pay-TV system;channel protection;scrambler;smart card
公开日期: 1997
摘要: 有线电视系统是指用户端藉由付费而能够收看电视节目的商业电视系统。
而在这里所谓的频道保护,目的在于保证只有付费的合法用户才能收看到
电视频道上的节目,而不合法的用户则没有能力收看。在许多实际的系统
中的做法,电视节目在传送到用户端之前已先经由搅乱器加以加密保护,
只有合法的用户才拥有解密金匙而正确地解回原来的电视节目。而为了更
安全的考量,这些金匙需要经常地加以更新。将更新的金匙各别地传送给
合法的用户是相当没有效率的做法。在本论文中,我们对于几种不同的情
况总共提出了三个金匙发送方法,目的都是将更新的金匙安全而有效率地
传送给合法的用户端。在这些方法中,都只需要一个或两个讯息的传送就
可达到所有用户更新金匙。而且只用到简单的运算,如对称型加解密运算
、单向函数以及XOR函数,适合实作于使用智慧卡的系统中。
A Pay-TV system is a commercial TV system, which charges its
subscribers for receiving the TV programs. The purpose of
channel protection is to insure that only the authorized
subscribers, who have paid the fee, can watch the TV programs,
while an unauthorized viewer can see nothing intelligible. In
many real systems, TV programs are scrambled before
broadcasting, and only the authorized subscribers will get the
keys to descramble the original TV programs correctly. For
higher security consideration, thekeys should be updated
constantly. It is a very inefficient way to send the updated
keys to each subscriber respectively. In this thesis, we
proposed three key distribution schemes for different situations
in order to efficiently and securely distribute the keys to the
authorized subscribers. In these schemes, only one or two
messages are transmitted for updating the keys, and only simple
computation functions, i.e. the symmetric key encryption/
decryption function, the one-way function and the XOR function,
are adopted for implementation in the smart card-based systems.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT860392065
http://hdl.handle.net/11536/62799
显示于类别:Thesis