SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
The AES encryption mechanism can work in two different modes:
• The first mode is called the global protection mode. In this mode, all different
DVB-S2 streams are encrypted with the same content key. One pair of odd and
even content keys or one pair of odd and even encrypted content keys can be
entered in the modulator.
EL170/470/970 >> Modulator >> Control>> Modulation >> AES
>> Global
Figure 118 - Global Content Keys
His second mode is called protection per stream. In this mode, all different DVB-
S2 streams are encrypted with a different content key. This means that different
sets of content keys must be entered in the modulator for each different stream
that needs to be encrypted. On most Newtec devices, a total of four pairs of odd
and even content keys or pairs of odd and even encrypted content keys can be
linked to the ISI-values of the streams that need to be encrypted. On the AZ810
Stream Aggregator, specifically designed for 6 streams, up to 6 key pairs can be
used, one for each possible stream.
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