SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
9.13.3.8 Multi-stream Transmissions to Different Groups of Receivers
If receivers are only part of one group and all receivers of the same group receive
the same content, the group key is well adapted to this case.
It can also happen that the group of receivers shall differ for each stream. But as
one receiver can receive several streams, groups must be defined per stream. In
this case two options are possible:
• Send the (encrypted) keys of each stream only to the relevant receivers. The
sending should be unit-casted as other receivers with the same group key could
decrypt the stream key too;
• Define one group key per receiver and to send the encrypted content keys to
those receivers only. This solution has the advantage that a message
intercepted cannot be used on another receiver (unless group keys are known
publicly).
9.13.3.9 Deleting Keys
EL170/470/970 >> Unit >> Control >> AES
A command “Erase All Keys” is implemented to erase all AES-related keys on that
device. This command erases (i.e. writes a 0xFFF…FF value):
• The group key;
• The content keys that are in use.
The content keys stored in device configurations are NOT erased.
A factory reset will erase all keys stored in the device.
9.13.4 Generating Encrypted Content Keys
Newtec distributes a simple web-based java script to compute
encrypted keys for a specific device.
Use the Newtec Service Desk tool to receive a copy:
> Browse to http://customersupport.newtec.eu .
> Fill in your Username and Password
> Create a ticket
As response of your request you will receive the script from our
support team.
In case you don't have a Username and Password yet for the
Newtec Service Desk tool: request a login to
customersupport@newtec.eu.
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