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4.10.3.
Scrambling Control Groups (SCG)
This table lists all Scrambling Control Groups used in the device. Programs connected to the same SCG are scrambled at the same
time with the same control word (encryption key). Each SCG can contain one or more program. Programs are connected to SCGs at
page Phase2 (see 3.11.7 on page 57).
Name
: Only used in GUI to easily identify the scrambling groups. Therefore groups should have descriptive names to enable easy
identification at Phase2 when connecting programs to SCGs.
•
Algorithm
(scrambling algorithm) option values:
# disabled
: scrambling for this SCG is actually disabled
# DVB-CSA-1
: common scrambling algorithmus with reduced entropy, 48 bit keys
# DVB-CSA-2
: common scrambling algorithmus with full length keys, 64 bit keys
# DVB-CISSA
: common IPTV software-oriented scrambling algorithm
# ATIS-IDSA
: ATIS – IIF default scrambling algorithm
# AES-ECB
: advanced encryption standard electronic code book mode
# AES-CBC
: advanced encryption standard cipher block chaining mode
•
Scrambling Policy
option values:
# All ECMGs
: Programs connected to this SCG are scrambled only if all ECMGs are
connected
# Any ECMG
: Programs connected to this SCG are scrambled as long as at least one
ECMG is connected
# Always
: Programs are scrambled always. If all ECMG connections are lost, no one
is able to descramble.
•
Fallback
: (Fallback rule) in case Scrambling Policy (defined above) is not fulfilled. Option values:
# Revert to clear : Stop scrambling. Subscribers will receive programs as unscrambled. Also
non-subscribers are able to view the content.
# Keep last CW : Scrambling is continued using the last CW and the last received ECM.
Subscribers are able to continue the descrambling.
•
Crypto Period (sec)
Min. period in seconds for one control word (encryption key). Also ECM generator can specify a
minimum period it supports and in this case larger of these two values is used.
•
Status
(scrambling status) shown as traffic lights, to provide a quick visual feedback.
