DigiCipher 2: Difference between revisions
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'''DigiCipher 2''', or simply '''DCII''', is a proprietary standard format of digital signal transmission and it doubles as an [[encryption]] standard with MPEG-2/MPEG-4 signal [[video compression]] used on many [[communications satellite]] [[television]] and audio signals. The DCII standard was originally developed in 1997 by [[General Instrument]], which then became the Home and Network Mobility division of [[Motorola]], then bought by [[Google]] in Aug 2011, and lastly became the Home portion of the division to [[Arris Group|Arris]].<ref>{{cite web|url=https://www.engadget.com/2013/04/17/arris-closes-deal-to-buy-motorola-home-cable-and-internet-biz-fr/|title=Arris closes deal to buy Motorola Home cable and internet biz from Google |
'''DigiCipher 2''', or simply '''DCII''', is a proprietary standard format of digital signal transmission and it doubles as an [[encryption]] standard with MPEG-2/MPEG-4 signal [[video compression]] used on many [[communications satellite]] [[television]] and audio signals. The DCII standard was originally developed in 1997 by [[General Instrument]], which then became the Home and Network Mobility division of [[Motorola]], then bought by [[Google]] in Aug 2011, and lastly became the Home portion of the division to [[Arris Group|Arris]].<ref>{{cite web|url=https://www.engadget.com/2013/04/17/arris-closes-deal-to-buy-motorola-home-cable-and-internet-biz-fr/|title=Arris closes deal to buy Motorola Home cable and internet biz from Google|website=engadget.com|date=17 April 2013 }}</ref> |
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The original attempt for a North American digital signal encryption and compression standard was DigiCipher 1, which was used most notably in the now-defunct [[PrimeStar]] medium-power [[direct broadcast satellite]] (DBS) system during the early 1990s. The DCII standard predates wide acceptance of [[Digital Video Broadcasting|DVB]]-based digital terrestrial television compression (although not cable or satellite DVB) and therefore is incompatible with the DVB standard. |
The original attempt for a North American digital signal encryption and compression standard was DigiCipher 1, which was used most notably in the now-defunct [[PrimeStar]] medium-power [[direct broadcast satellite]] (DBS) system during the early 1990s. The DCII standard predates wide acceptance of [[Digital Video Broadcasting|DVB]]-based digital terrestrial television compression (although not cable or satellite DVB) and therefore is incompatible with the DVB standard. |
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Approximately 70% of newer first-generation [[digital cable]] networks in North America use the [[4DTV]]/DigiCipher 2 format.<ref name="auto">{{cite web|title=North American MPEG-2 Information|url=http://www.coolstf.com/mpeg/#dcii}}</ref> The use of DCII is most prevalent in North American digital [[cable television]] [[set-top box]]es. DCII is also used on Motorola's 4DTV digital [[satellite television]] [[tuner (television)|tuner]] and [[Shaw Direct]]'s DBS receiver. |
Approximately 70% of newer first-generation [[digital cable]] networks in North America use the [[4DTV]]/DigiCipher 2 format.<ref name="auto">{{cite web|title=North American MPEG-2 Information|url=http://www.coolstf.com/mpeg/#dcii}}</ref> The use of DCII is most prevalent in North American digital [[cable television]] [[set-top box]]es. DCII is also used on Motorola's 4DTV digital [[satellite television]] [[tuner (television)|tuner]] and [[Shaw Direct]]'s DBS receiver. |
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The DigiCipher 2 encryption standard was reverse engineered in 2016.<ref>{{cite web|title=How Do I Crack Satellite and Cable Pay TV? [33c3]|url=https://media.ccc.de/v/33c3-8127-how_do_i_crack_satellite_and_cable_pay_tv}}</ref> |
The DigiCipher 2 encryption standard was reverse engineered in 2016.<ref>{{cite web|title=How Do I Crack Satellite and Cable Pay TV? [33c3]|date=27 December 2016 |url=https://media.ccc.de/v/33c3-8127-how_do_i_crack_satellite_and_cable_pay_tv}}</ref> |
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==Technical specifications |
==Technical specifications== |
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DigiCipher II uses QPSK and BPSK at the same time. The primary difference between DigiCipher 2 and DVB lies in how each standard handles SI [[metadata]], or System Information, where DVB reserves packet identifiers from 16 to 31 for metadata, DigiCipher reserves only packet identifier 8187 for its [[Program and System Information Protocol|master guide table]] which acts as a ''look-up table'' for all other metadata tables. DigiCipher 2 also extends the MPEG ''program number'' that is assigned for each service in a transport stream with the concept of a [[virtual channel]] number, whereas the DVB system never defined this type of remapping preferring to use a registry of ''network'' identifiers to further differentiate ''program numbers'' from those used in other transport streams. There are also private non-standard additions to DVB that add virtual channel remapping using ''logical channel numbers''. Also unlike DVB, all text used in descriptors can be compressed using standard [[Huffman coding]] which saves on broadcast bandwidth and loading times. |
DigiCipher II uses QPSK and BPSK at the same time. The primary difference between DigiCipher 2 and DVB lies in how each standard handles SI [[metadata]], or System Information, where DVB reserves packet identifiers from 16 to 31 for metadata, DigiCipher reserves only packet identifier 8187 for its [[Program and System Information Protocol|master guide table]] which acts as a ''look-up table'' for all other metadata tables. DigiCipher 2 also extends the MPEG ''program number'' that is assigned for each service in a transport stream with the concept of a [[virtual channel]] number, whereas the DVB system never defined this type of remapping preferring to use a registry of ''network'' identifiers to further differentiate ''program numbers'' from those used in other transport streams. There are also private non-standard additions to DVB that add virtual channel remapping using ''logical channel numbers''. Also unlike DVB, all text used in descriptors can be compressed using standard [[Huffman coding]] which saves on broadcast bandwidth and loading times. DigiCipher II uses [[Dolby Digital|Dolby Digital AC-3]] audio for all channels, although MPEG-1 Level 2 audio is not supported.<ref name="auto"/> |
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DigiCipher II uses [[Dolby Digital|Dolby Digital AC-3]] audio for all channels, although MPEG-1 Level 2 audio is not supported. |
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==External links== |
==External links== |
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[[Category:Cryptographic protocols]] |
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[[Category:Television terminology]] |
[[Category:Television terminology]] |
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[[Category:Conditional-access television broadcasting]] |
[[Category:Conditional-access television broadcasting]] |
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[[Category:Digital rights management systems]] |
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[[Category:Telecommunications-related introductions in 1997]] |
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[[Category:Audiovisual introductions in 1997]] |
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Latest revision as of 13:25, 14 December 2023
 | This article needs additional citations for verification. (September 2014) |
DigiCipher 2, or simply DCII, is a proprietary standard format of digital signal transmission and it doubles as an encryption standard with MPEG-2/MPEG-4 signal video compression used on many communications satellite television and audio signals. The DCII standard was originally developed in 1997 by General Instrument, which then became the Home and Network Mobility division of Motorola, then bought by Google in Aug 2011, and lastly became the Home portion of the division to Arris.[1]
The original attempt for a North American digital signal encryption and compression standard was DigiCipher 1, which was used most notably in the now-defunct PrimeStar medium-power direct broadcast satellite (DBS) system during the early 1990s. The DCII standard predates wide acceptance of DVB-based digital terrestrial television compression (although not cable or satellite DVB) and therefore is incompatible with the DVB standard.
Approximately 70% of newer first-generation digital cable networks in North America use the 4DTV/DigiCipher 2 format.[2] The use of DCII is most prevalent in North American digital cable television set-top boxes. DCII is also used on Motorola's 4DTV digital satellite television tuner and Shaw Direct's DBS receiver.
The DigiCipher 2 encryption standard was reverse engineered in 2016.[3]
Technical specifications
[edit]DigiCipher II uses QPSK and BPSK at the same time. The primary difference between DigiCipher 2 and DVB lies in how each standard handles SI metadata, or System Information, where DVB reserves packet identifiers from 16 to 31 for metadata, DigiCipher reserves only packet identifier 8187 for its master guide table which acts as a look-up table for all other metadata tables. DigiCipher 2 also extends the MPEG program number that is assigned for each service in a transport stream with the concept of a virtual channel number, whereas the DVB system never defined this type of remapping preferring to use a registry of network identifiers to further differentiate program numbers from those used in other transport streams. There are also private non-standard additions to DVB that add virtual channel remapping using logical channel numbers. Also unlike DVB, all text used in descriptors can be compressed using standard Huffman coding which saves on broadcast bandwidth and loading times. DigiCipher II uses Dolby Digital AC-3 audio for all channels, although MPEG-1 Level 2 audio is not supported.[2]
External links
[edit]References
[edit]- ^ "Arris closes deal to buy Motorola Home cable and internet biz from Google". engadget.com. 17 April 2013.
- ^ a b "North American MPEG-2 Information".
- ^ "How Do I Crack Satellite and Cable Pay TV? [33c3]". 27 December 2016.