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BISS = Basic Interoperable Scrambling System, usually known as BISS, is a satellite signal scrambling system developed by the European Broadcasting Union and a consortium of hardware manufacturers.
Prior to its development, "ad-hoc" or "Occasional Use" satellite news feeds were transmitted without any encryption. This allowed anyone with the correct equipment to view the program material. Using BISS the transmission is protected by a 12 digit "session key" that is agreed by the transmitting and receiving parties prior to transmission. The key is entered into both the encoder and decoder , this key then forms part of the encryption of the digital TV signal and only receivers with the correct key will decrypt the signal.
BISS mode 0 : unscrambled (clear)•
BISS mode 1 : scrambled with session word (SW)•
BISS mode E : scrambled with encrypted session word(ESW)•
The session word is the key that is used in the receiver (IRD) to descramble the transmitted data.• Remark that BISS-E uses the same scrambling algorithm as BISS mode 1 but that there is an additional encryption on the session word
BISS mode 1•
BISS mode 1 uses a 12 digit hexadecimal key as session word. The session word has to be announced to all parties that are allowed to descramble the received data.• Example : 123456ABCDEF• The session word can easily be compromised, there is no protection when communicating it to the receive site(s).
BISS mode E•
BISS mode E : scrambled with encrypted session word(ESW)• This mode uses the ID (identifier) of the receiver(s) and a session word to calculate an encrypted session word(16 digits hex)• There are two possible IDs - buried ID- injected ID• By encrypting the session word there is an additional protection on the session word. The ESW can be communicated using a non-secure channel since in order to descramble the received signal both the ID and the ESW need to be known.
Calculation of encrypted session word
1.Define a SW
2. Get the IDExchange ESWEnter ESW in IRD(s)
3.Calculate ESW To calculate the ESW
4. the DES algorithm is used
Each receiver (IRD) holds a unique ID (cfr. serialnumber) that can be used to identify that specific receiver : this is called the buried ID. • If you want to do a transmission that is to be received by only one specific receiver, use the buried ID to calculate the encrypted session word
An identifier can be entered (injected) in a receiver (IRD), this injected ID can be entered in a single or a group of IRDs. • This allows a BISS-E protected transmission to a group of IRDs.
MPEG null packets are stripped from the incoming transport stream. Then the scrambling algorithm isapplied to the transport stream. • After that, MPEG null packets are multiplexed with the scrambled transport stream (stuffing) to arrive at the desired output rate
Operation BISS mode 1•
Connect the scrambler between the encoder and modulator.• Select output interface rate (must be equal or higher than output interface rate of the encoder)• Select BISS mode.• In case of BISS mode 1 with clear session word, enter the 12 digit session word.• Communicate the session word to the receive site(s).
Operation BISS mode Ewith buried ID•
Connect the scrambler between the encoder and modulator.• Select output interface rate (must be equal or higher than output interface rate of the encoder)• Select BISS mode.• In case of BISS mode E with buried ID, get the buried IDof the IRD and use this together with a session word tocalculated the encrypted session word (using the DES3 algorithm).• Communicate the ESW to the receive site
Operation BISS mode Ewith injected ID•
Connect the scrambler between the encoder and modulator.• Select output interface rate (must be equal or higher than output interface rate of the encoder)• Select BISS mode.• In case of BISS mode E with injected ID, get the injectedID of the IRD(s) and use this together with a session word to calculated the encrypted session word (using the DES3 algorithm).• Communicate the ESW to the receive site(s).