SHAPING THE FUTURE SATELLITE OF COMMUNICATIONS
8.2 BISS
The Basic Interoperable Scrambling System (BISS) is used on digital contribution
circuits (satellite, DSNG, etc.) which uses MPEG compression, the DVB-S and
DVB-S2 modulation schemes and the DVB Common Scrambling Algorithm with
fixed keys.
BISS-E uses encrypted Session Keys and allows centrally-managed Conditional
Access.
8.2.1 Overview
The Basic Interoperable Scrambling System (BISS) is based on the DVB-CSA
specification [1], and the use of fixed clear keys called Session Words (SWs).
BISS specification Mode 1, in Newtec Equipment, is used for DSNG.
BISS specification Mode E (BISS with Encrypted keys – referred to as BISS-E)
introduces an additional mechanism to accept the insertion of Encrypted Session
Words (ESWs) while, at the same time, conserving interoperability. This
mechanism is backward compatible with BISS specification Mode 1.
The following definitions are used:
• Scrambler relates to the overall mechanisms required to meet
the DVB-CSA specification;
• Session Word (SW) relates to the word assigned during a
transmission by the Management Centre;
• Unit relates to the Newtec Equipment;
• Management Centre refers to an organization controlling or
managing the conditional access system;
• Decryption function refers to a logical function used to
decrypt the Encrypted Session Words, with the help of a key;
• Interoperable function refers to a decryption function that is
embedded in all units containing BISS functionality.
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