SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
9.13.3 Operation of AES
9.13.3.1 Setting a Key for the Transmission
Starting point: The encryptor sends clear data to the decryptor. Both have their
encryption mode set to “Off” or no encryption.
Steps:
1. The odd content key is entered in the decryptor;
2. The decryptor encryption mode is set to “On”;
3. The odd content key is entered in the encryptor.;The encryptor encryption mode
is set to “On”.
9.13.3.2 Changing Keys Seamlessly
Starting point: The encryptor sends encrypted data to the decryptor. The odd key
is active. Both have their encryption mode set to “On”.
Steps:
1. The even content key is entered in the decryptor;
2. The even content key is entered in the encryptor;
3. The encryptor is toggled to use the even key.
An alternative is to turn the encryptor off, change the keys on
encryptor and decryptor and turn the encryptor back on. The
drawback is that the content is in clear for the time needed to
change all the keys.
9.13.3.3 Adding a Receiver to the Network
Starting point: The encryptor sends encrypted data to several descriptors all using
the same content key.
Steps:
1. Simply send the correct content key to that new receiver;
2. Turn on the decryptor of the new receiver.
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