1

I am bit confused between video scrambling and video encryption. I know both are the ways to make the safe delivery of the content and both have de-scrambler and de-crypt and use a key as well but in DVB broadcast we use scrambling at CAS level and not encryption like in MPEG2TS we send ECM info for scrambling.

So, my query is what is the exact difference between them, when to use what and why?

I know its a very common question but the googling is not giving much answers.

Can anyone help?

4

2 回答 2

2

在广播电视的情况下。

加扰是为数据流生成一个称为控制字的 48 位密钥。

并且加密用于在传输到接收器期间保护控制字：控制字被加密为授权控制消息（ECM）。

因此首先使用控制字对数据进行加扰，然后通过生成 ecms 使用加密对其进行保护

于 2013-08-22T11:48:47.183 回答
0

加密基本上是将信号转换为不可读的格式。像 emm 和 ecm 这样的密钥是加密的。加扰是限制音频/视频内容访问的过程

于 2014-12-15T11:43:26.763 回答