Newtec EL170 - Page 175

Features
User Manual for EL170/970/470 IP Satellite Modulator/
Demodulator/Modem
version 4.2
174
SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
In the section below, all keys or data are represented in
hexadecimal. For the algorithms, they are represented with the
most significant byte (bit) first.
9.13.4.1 128-bit Keys
The computation of the encrypted content key from a given content key is depicted
in the following figure.
AES
Encryp
Encrypted
Content Key
Group Key
Content Key
128 bits
128 bits
128
bits
Key
Data in
Data out
Figure 120 - Process to Encrypt a Content Key with a Specific Group Key in 128-bit
Mode
The following lines provide a few examples of key computations for reference:
Example 1:
Content Key: e81816b87e5cf9c4e81816b87e5cf9c4
Group Key: d9d47fae81fad3154384d79cf1278306
Encrypted Content Key: be9c253b8e707ee851ba5ce6dd388753
Example 2:
Content Key: 1234567890abcdef1234567890abcdef
Group Key: d9d47fae81fad3154384d79cf1278306
Encrypted Content Key: d52e1da09a29691f85f9d5da74e07bed
Example 3:
Content Key: 1234567890abcdef1234567890abcdef
Group Key: 06450f0aaa9b9655ee9c4073097c7b08
Encrypted Content Key: 9df1586017ee2b0417eebf86ac6d4627