DVB-CSA-1 与 DVB-CSA-2
我需要 mpeg2-ts DVB 和广播专家的帮助。有人能告诉我这些算法之间的共同点有什么区别吗?
I need some help from mpeg2-ts DVB and broadcasting experts. Can someone tell me what is the difference between those algorithms in common.
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它们是两种不同的内容加扰方案。 AFAIK,CSA2 在发行中从未被大量使用(根本没有?)。贡献则是另一回事,CSA2 在那里得到了更广泛的采用。
广播加扰算法在 TS 100 289 以及 TS 103 127。看来 CSA3 现在也用于一些 IPTV 部署中。
They are two different content scrambling schemes. AFAIK, CSA2 has never been used much (at all?) in distribution. Contribution is a different story, and CSA2 has seen wider adoption there.
Scrambling algorithms for broadcast are defined in TS 100 289 and for IPTV in TS 103 127. It seems that CSA3 is now used in some IPTV deployments, too.
它们都有 64 位控制字。然而,在CSA1中,只有48位用于传输uniq密钥数据,其他16位可以根据它们计算出来。
CSA2 将所有 64 位作为密钥。
由于密钥更长,这使得 CSA2 更加安全。
There are 64 bits control words in either of them. However, in the CSA1 only 48 bits are used for transferring the uniq key data and other 16 bits can be calculated based on them.
CSA2 has all 64 bits as a key.
That makes CSA2 more secure as a key is longer.