Newtec AZ110 - Page 95

Features
User Manual for AZ110 Broadcast Satellite Modulator with ASI interface
version 3.2
94
SHAPING THE FUTURE SATELLITE OF COMMUNICATIONS
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
8.3.4.2 64-bit Keys
A similar process is used for the computation of encrypted content keys in the 64-
bit mode. The computation of the encrypted content key from a given content key
is depicted in the following figure.
DES
Encryp
Encrypted
Content Key
Group Key
Content Key
64 bits
64 bits
64
bits
Key
Data in
Data out
Figure 52 - Process to Encrypt a Content Key with a Specific Group Key in 64-bit Mode
The DES algorithm used is the one described in the FIPS-46-3 standard from the
NIST.
The following lines provide a few examples of key computations for reference:
Example 1:
Content Key: 278da56a0f06aa1f
Group Key: fb5f9c585dd359aa