How do satellite tv descramblers work? Each VC-II+ has a unique
ID number, which are given to programming services when you
subscribe to a channel or package. The programming service
broadcasts your ID number, and a special code that instructs your
descrambler to work when tuned to a subscribed channel.
Why are satellite tv descramblers digital? The real reason the
sound is digital is NOT to provide sound quality, but rather to
insure that unauthorized reception is not all that easy, and a
decoder can not be built from scratch. The scrambling system uses
a dual decryption key system, and is based on the USA DES
encryption standard (this is a military sensitive system, making
export of VCII type decoder’s illegal).
The scrambling method consists of:
The authorization center (in California) creates the master
data stream. This data stream contains a digitally derived key
based upon the serial number of EACH authorized decoder and a
"Tier bit" for EACH channel it is authorized to receive
(determined by PAYING for the service)
"SEED KEYS" in the receiver itself combine with the other half
of the key (transmitted by the authorization center) and create
the master key used to decode the audio and turn on the video
descrambling circuit
How much do the descramblers cost? A satellite tv descramblers
can cost you $300+ if you have to buy one yourself. However if you
subscribe to Dish Network or DIRECTV you do not need to purchase
them separately because they are included with the satellite tv
systems on offer. In fact the entire satellite system including a
dish, up to 4 receivers, remote control and installation can be
yours for free with a 12-month programming subscription.
To find out more about satellite tv descramblers and the
associated products and services visit the following links:
