|Pirateer's Scrambling & Descrambling Page - Scrambling Systems in Use Today -

System & Type Of Scrambling Used
Scrambling Method Used
Security Level
COMSAT SATGUARD
Dupresses horizontal synch, audio combined with complex digital 15.734-khz waveform
Moderately High Video And Audio
Analog Audio
Video Line Inversion, Individual Lines Specifically
Analog Video [SATELLITE]
TELEASE
Sine wave (94 khz) aded to video; audio is modulated on 15.6 khz (approximately) subcarrier
Moderate
Analog Audio
Analog Video [SATELLITE]
OAK SYSTEMS
Video may be inverted; synch missing
Audio High
1. Oak Orion
Color burst moved to nonstandard location; random video polarity sequences
Moderate Video
Digital Audio
Audio is digital, with data pulses in the horizontal blanking interval; audio may be further encrypted
Analog Video [SATELLITE]
2. Oak Polaris
Video lines shuffled, DES encrypted
Very High Audio
Audio in horizontal blanking interval digital, DES encrypted
Very High Video
Digital Audio
Digital Video [SATELLITE]
3. Oak (Sine wave)[CABLE]
Video modulated with 15.7 khz or 31.5 khz sine wave; audio on 62.5 khz subcarrier
Low to Moderate Video
Analog Audio
Analog Video
4. Oak SIGMA[CABLE]
Video randomly inverted on scene changes Synch omitted; vertical and horizontal synch intervals have digitized encrypted audio
Very High Audio
Analog Video
Decryption keys on seperate carrier [CABLE]
Digital Audio
GI STAR-LOK
Synch and color burst are removed and scanning lines diced and rotated according to DES algorithm
Very High Video
Digital Video
Audio is digital and DES encrypted
Digital Audio [SATELLITE]
MA-COM LINKABIT, INC
Video lines diced in variable size segments and DES encrypted
Very High Video
Very High Audio
1. VideoCipher I
Audio is digital and DES encrypted
Digital Video
Digital Audio [SATELLITE]
2. VideoCipher II
Video inverted synch removed; color burst relocated
Moderate Video
Analog Video
Audio is digital in the horizontal blanking intervals and DES encrypted
Very High Audio
Digital Audio [SATELLITE]
JERROLD STARCOM
Synch suppression pseudo random (6-10 db); audio clear
Low to Moderate Video
Audio Clear
1. Analog Video [CABLE]
TOCOM
Video randomly inverted; random synch supression and video may be compressed
Low to Moderate Video
Analog Video
Audio Clear
Audio Clear
Clear Audio [CABLE]
ZENITH
Video randomly inverted. Audio on subcarrier is synch suppressed
Moderate Video
SSAVI, z TAC
Analog Audio
Analog Video [CABLE](Over-The-Air)
HAMLIN
Random synch supression similar to SSAVI
Moderate Video And Audio
Analog Video
Analog Audio [CABLE]
SCIENTIFIC ATLANTA B-MAC
Video time compressed, luminance and chroma sent seperately
High Video
High Audio
Synch and data sent in random-width packets of digitized audio
Digital Video
Digital Audio [SATELLITE]
Non-NTSC format
High Audio
SINE WAVE
Video has interfering sine wave superimposed. Audio is on a 15 khz subcarrier
Moderately Low Video And Audio
Analog, From Various Manufacturers
Cable, Over-The-Air UHF
GATED SYNCH
Synch pulses suppressed by fixed amount
Low Video And Audio
Decoder Is Simple To Build
Analog, From Various Manufacturers
Cable, Over-The-Air UHF
OUTBAND
Synch pulses on seperate video carrier that is usually in FM broadcast band
Low Video
No Audio
[CABLE]
Audio May Be In Clear
Decoder Is Simple To Build
Analog Video And Audio
Main program video has synch pulses removed
Various Manufacturers [CABLE]
"NASA" SYSTEM
Horizontal lines shifted in groups
Moderate Video
Video polarity inverted in various lines
No audio unless encrypted
Analog Video [SATELLITE]
Audio may or may not be encrypted


Chart Courtesy Of: Video Scrambling & Descrambling for Satellite & Cable TV By: Rudolf F. Graf & William Sheets (Second Edition)(1998)


The Information Provided On This Page Is For Education Use Only & To Aid In The Understanding Of How Various Scrambling Systems Are Used & How They Are Operated . . .

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