Conditional access

Short description: System used to prevent non-paying customers from accessing content that requires payment

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Conditional access (CA) is a term commonly used in relation to software and to digital television systems. Conditional access is an evaluation to ensure the person who is seeking access to content is authorized to access the content. Access is managed by requiring certain criteria to be met before granting access to the content.

## Contents

* 1 In software
* 2 In digital television
* 2.1 Conditional access in North America
* 2.2 Conditional access systems
* 2.2.1 Analog systems
* 2.2.2 Digital systems
* 3 See also
* 4 References
* 5 External links

## In software

Conditional access is a function that lets an organization manage people's access to the software in question, such as email, applications, and documents. It is usually offered as SaaS (Software-as-a-Service) and deployed in organizations to keep company data safe. By setting conditions on the access to this data, the organization has more control over who accesses the data and where and in what way the information is accessed.

When setting up conditional access, access can be limited to or prevented based on the policy defined by the system administrator. For example, a policy might require that access is available from certain networks, or access is blocked when a specific web browser is requesting the access.

## In digital television

Under the Digital Video Broadcasting (DVB) standard, conditional access system (CAS) standards are defined in the specification documents for DVB-CA (conditional access), DVB-CSA (the common scrambling algorithm) and DVB-CI (the Common Interface).[1] These standards define a method by which one can obfuscate a digital-television stream, with access provided only to those with valid decryption smart-cards. The DVB specifications for conditional access are available from the standards page on the DVB website.

This is achieved by a combination of scrambling and encryption. The data stream is scrambled with a 48-bit secret key, called the control word. Knowing the value of the control word at a given moment is of relatively little value, as under normal conditions, content providers will change the control word several times per minute. The control word is generated automatically in such a way that successive values are not usually predictable; the DVB specification recommends using a physical process for that.

In order for the receiver to unscramble the data stream, it must be permanently informed about the current value of the control word. In practice, it must be informed slightly in advance, so that no viewing interruption occurs. Encryption is used to protect the control word during transmission to the receiver: the control word is encrypted as an entitlement control message (ECM). The CA subsystem in the receiver will decrypt the control word only when authorised to do so; that authority is sent to the receiver in the form of an entitlement management message (EMM). The EMMs are specific to each subscriber, as identified by the smart card in his receiver, or to groups of subscribers, and are issued much less frequently than ECMs, usually at monthly intervals. This being apparently not sufficient to prevent unauthorized viewing, TPS has lowered this interval down to about 12 minutes. This can be different for every provider, BSkyB uses a term of 6 weeks. When Nagravision 2 was hacked, Digital+ started sending a new EMM every three days to make unauthorized viewing more cumbersome.

The contents of ECMs and EMMs are not standardized and as such they depend on the conditional access system being used.[2]

The control word can be transmitted through different ECMs at once. This allows the use of several conditional access systems at the same time, a DVB feature called simulcrypt, which saves bandwidth and encourages multiplex operators to cooperate. DVB Simulcrypt is widespread in Europe; some channels, like the CNN International Europe from the Hot Bird satellites, can use seven different CA systems in parallel.

The decryption cards are read, and sometimes updated with specific access rights, either through a conditional-access module (CAM), a PC card-format card reader meeting DVB-CI standards, or through a built-in ISO/IEC 7816 card reader, such as that in the Sky Digibox.

Several companies provide competing CA systems; ABV, VideoGuard, Irdeto, Nagravision, Conax, Viaccess, Synamedia, Mediaguard (a.k.a. SECA) are among the most commonly used CA systems.

Due to the common usage of CA in DVB systems, many tools to aid in or even directly circumvent encryption exist. CAM emulators and multiple-format CAMs exist which can either read several card formats or even directly decrypt a compromised encryption scheme. Most multiple format CAMs and all CAMs that directly decrypt a signal are based on reverse engineering of the CA systems. A large proportion of the systems currently in use for DVB encryption have been opened to full decryption at some point, including Nagravision, Conax, Viaccess, Mediaguard (v1) as well as the first version of VideoGuard.

### Conditional access in North America

In Canada and the United States, the standard for conditional access is provided with CableCARDs whose specification was developed by the cable company consortium CableLabs.

Cable companies in the United States are required by the Federal Communications Commission to support CableCARDs. Standards exist for two-way communication (M-card), but satellite television has separate standards. Next-generation approaches in the United States eschew such physical cards and employ schemes using downloadable software for conditional access such as DCAS.

The main appeal of such approaches is that the access control may be upgraded dynamically in response to security breaches without requiring expensive exchanges of physical conditional-access modules.

### Conditional access systems

Conditional access systems include:

#### Analog systems

* EuroCrypt
* Nagravision
* Videocipher
* VideoCrypt

#### Digital systems

CA ID | Name | Developed by | Introduced (year) | Security | Notes

|
|
|
|
|

0x4AEB | Abel Quintic | Abel DRM Systems | 2009 | Secure |
0x4A64, 0x4AF0, 0x4AF2, 0x4B4B, 0x4B4C | ABV CAS | ABV International Pte. Ltd | 2006 | Secure (Farncombe Certified) | CA, DRM, Middleware & Turnkey Solution Provider For DTH, DVBT/T2, DVBC, OTT, IPTV, VOD, Catchup TV, Audience Measurement System, EAD etc.
0x4AFC | Panaccess | Panaccess Systems GmbH | 2010 | Secure (Farncombe Certified) | CA for DVB-S/S2, DVB-T/T2, DVB-C, DVB-IP, OTT, VOD, Catchup etc.
0x4B19 | RCAS or RIDSYS cas | RIDSYS, INDIA | 2012 | Secure | CA for DVB-C, IPTV, OTT, VOD, Catchup etc.
0x4B30, 0x4B31 | ViCAS | Vietnam Multimedia Corporation (VTC) | Unknown | Secure (Farncombe Certified) |
0x4800 | Accessgate | Telemann | Unknown  |  |
0x4A20 | AlphaCrypt | AlphaCrypt | Unknown  |  |
N/A | B-CAS ARIB STD-B25 (Multi-2) | Association of Radio Industries and Businesses (ARIB)  | 2000  |  | CA for ISDB. Used in Japan only
0x1702, 0x1722, 0x1762 | reserved for various non-BetaResearch CA systems | Formally owned by BetaTechnik/Beta Research (subsidiary of KirchMedia). Handed over to TV operators to handle with their CA systems. | Unknown  |  |
0x1700 – 0x1701, 0x1703 – 0x1721, 0x1723 – 0x1761, 0x1763 – 0x17ff, 0x5601 – 0x5604 | VCAS DVB | Verimatrix Inc. | 2010  |  |
0x2600

0x2610

| BISS

BISS-E

| European Broadcasting Union | 2002

2018

| Compromised, BISS-E secure |
0x27A0-0x27A4  | ICAS (Indian CAS)  | ByDesign India Private Limited  | 2015  | Advanced Embedded Secure  |
0x4900 | China Crypt | CrytoWorks (China) (Irdeto) | Unknown  |  |
0x22F0 | Codicrypt | Scopus Network Technologies (now part of Harmonic) | Unknown  | Secure |
0x4AEA | Cryptoguard | Cryptoguard AB | 2008 | Secure |
0x0B00 | Conax Contego | Conax AS | Unknown  | Secure |
0x0B00 | Conax CAS 5 | Conax AS | Unknown  | Compromised | Pirate cards has existed
0x0B00 | Conax CAS 7.5 | Conax AS | Unknown  | Secure |
0x0B00, 0x0B01, 0x0B02, 0x0BAA | Conax CAS 7 | Conax AS | Unknown  | Compromised | Cardsharing
0x0B01, 0x0B02, 0x0B03, 0x0B04, 0x0B05, 0x0B06, 0x0B07 | Conax CAS 3 | Conax AS | Unknown  | Compromised | Pirate cards has existed
0x4AE4 | CoreCrypt | CoreTrust(Korea) | 2000 | S/W & H/W Security | CA for IPTV, Satellite, Cable TV and Mobile TV
0x4347 | CryptOn | CryptOn | Unknown  |  |
0x0D00, 0x0D02, 0x0D03, 0x0D05, 0x0D07, 0x0D20 | Cryptoworks | Philips CryptoTec | Unknown  | Partly compromised (older smartcards) |
0x4ABF | CTI-CAS | Beijing Compunicate Technology Inc. | Unknown  |  |
0x0700 | DigiCipher and DigiCipher II | Jerrold/GI/Motorola 4DTV | 1997  | Compromised | DVB-S2 compatible, used for retail BUD dish service and for commercial operations as source programming for cable operators.

Despite the Programming Center shutting down its consumer usage of DigiCipher 2 (as 4DTV) on August 24, 2016, it is still being used for cable headends across the United States, as well as on Shaw Direct in Canada.

0x4A70 | DreamCrypt | Dream Multimedia | 2004  |  | Proposed conditional access system used for Dreambox receivers.
0x4A10 | EasyCas | Easycas | Unknown  |  |
0x2719,0xEAD0 | InCrypt Cas | S-Curious Research & Technology Pvt. Ltd., Equality Consultancy Services | Unknown  |  |
0x0464 | EuroDec | Eurodec | Unknown  |  |
0x5448,0x6448  | Gospell VisionCrypt  | GOSPELL DIGITAL TECHNOLOGY CO., LTD.  | Unknown  | Secure  |
0x5501 | Griffin | Nucleus Systems, Ltd. | Unknown  |  |
0x5581 | Bulcrypt | Bulcrypt | 2009 |  | Used in Bulgaria and Serbia
0x0606 | Irdeto 1 | Irdeto | 1995 | Compromised (Cardsharing and MOSC available) |
0x0602, 0x0604, 0x0606, 0x0608, 0x0622, 0x0626, 0x0664, 0x0614 | Irdeto 2 | Irdeto | 2000
0x0624, 0x0648, 0x0650, 0x0639 | Irdeto 3 | Irdeto | 2010 | Compromised (Cardsharing available) |
0x0692, 0x06A4, 0x06B6, 0x069F, 0x06AB, 0x06F1 | Irdeto Cloaked | Irdeto | Unknown | Secure |
0x4AA1 | KeyFly | SIDSA | 2006  | Partly compromised (v. 1.0) |
0x0100 | Seca Mediaguard 1 | SECA | 1995  | Compromised |
0x0100 | Seca Mediaguard 2 (v1+) | SECA | 2002  | Partly compromised (MOSC available) |
0x0100 | Seca Mediaguard 3 | SECA | 2008 |  |
0x1800, 0x1801, 0x1810, 0x1830 | Nagravision | Nagravision | 2003 | Compromised |
0x1801 | Nagravision Carmageddon | Nagravision | Unknown  | Combination of Nagravision with BetaCrypt
0x1702, 0x1722, 0x1762, 0x1801 | Nagravision Aladin | Nagravision | Unknown  |
0x1801 | Nagravision 3 - Merlin | Nagravision | 2007 | Secure |
0x1801 | Nagravision - ELK | Nagravision | Circa 2008 | IPTV
0x4A02 | Tongfang | Tsinghua Tongfang Company | 2007  | Secure |
0x4AD4 | OmniCrypt | Widevine Technologies | 2004 |  |
0x0E00 | PowerVu | Scientific Atlanta | 1998  | Compromised | Professional system widely used by cable operators for source programming
0x0E00 | PowerVu+ | Scientific Atlanta | 2009
0x1000 | RAS (Remote Authorisation System) | Tandberg Television | Unknown  |  | Professional system, not intended for consumers.
0x4AC1 | Latens Systems | Latens | 2002 |  |
0xA101 | RosCrypt-M | NIIR | 2006 |  |
0x4A60, 0x4A61, 0x4A63 | SkyCrypt/Neotioncrypt/Neotion SHL | AtSky/Neotion[3] | 2003 |  |
Unknown | T-crypt | Tecsys  | Unknown  |  |
0x4A80 | ThalesCrypt | Thales Broadcast & Multimedia[4] | Unknown  |  | Viaccess modification. Was developed after TPS-Crypt was compromised.[5]
0x0500 | TPS-Crypt | France Telecom | Unknown  | Compromised | Viaccess modification used with Viaccess 2.3
0x0500 | Viaccess PC2.3, or Viaccess 1 | France Telecom | 1996  |
0x0500 | Viaccess PC2.4, or Viaccess 2 | France Telecom | 2002 |
0x0500 | Viaccess PC2.5, or Viaccess 2 | France Telecom | 2003  |
0x0500 | Viaccess PC2.6, or Viaccess 3 | France Telecom | 2005 |
0x0500 | Viaccess PC3.0 | France Telecom | 2007  |
0x0500 | Viaccess PC4.0 | France Telecom | 2008 |
Unknown  | Viaccess PC5.0 | France Telecom | 2011 | Secure |
Unknown  | Viaccess PC6.0 | France Telecom | 2015  |
0x0930, 0x0942 | Synamedia VideoGuard 1 | NDS (now part of Synamedia) | 1994 | Partly compromised (older smartcards) |
0x0911, 0x0960 | Synamedia VideoGuard 2 | NDS (now part of Synamedia) | 1999 | Secure |
0x0919, 0x0961, 0x09AC, 0x09C4, 0x091F, 0x0944, 0x09AA | Synamedia VideoGuard 3 | NDS (now part of Synamedia) | 2004 | Secure
0x0927, 0x09BF, 0x0910, 0x0913, 0x098C, 0x098D, 0x098E, 0x0911, 0x0950, 0x09BB, 0x0987, 0x0963, 0x093B, 0x09CD | Synamedia VideoGuard 4 | NDS (now part of Synamedia) | 2009 | Secure
0x56D0 | Onnet CA/DRM | Onnet Systems India Pvt. Ltd. | 2021 | Secure | CA/DRM, IPTV Middleware, OTT, Interactive Services, STB Middleware, AR/VR
0x4AD0, 0x4AD1 | X-Crypt | XCrypt Inc. | 2010  | Secure |
0x4AE0, 0x4AE1, 0x7be1 | DRE-Crypt | Cifra | 2004 | Secure |
Unknown  | PHI CAS  | RSCRYPTO  | 2016  | Secure  |

## See also

* Access control, the same principle applied outside of television.
* B-CAS
* CableCARD
* Card sharing
* Compression Networks
* Conditional-access module
* DigiCipher 2
* Digital rights management
* Pirate decryption
* PowerVu
* Smart card
* Television encryption
* Viaccess
* Videocipher
* VideoGuard
* Pairing Smartcard

## References

1. ↑ "Security" (in en-US). https://dvb.org/solutions/security/.
2. ↑ Conditional-access systems for digital broadcasting 2016-10
3. ↑ "Skycrypt". 2008-01-17. http://sat.uz/2008/01/17/skycrypt.html.
4. ↑ "What means ThalesCrypt? - AfterDawn". https://www.afterdawn.com/glossary/term.cfm/thalescrypt.
5. ↑ "TPSCrypt". 2008-01-17. http://sat.uz/2008/01/17/tpscrypt.html.

## External links

* CAS history in Spanish
* CA ID list on dvbservices.com

* v
* t
* e

Broadcast encryption and digital rights management

Conditional access|

* CableCARD
* Conditional access system
* Renewable security

DVB|

* Common Interface
* CSA
* Conditional-access module
* DVB-CPCM
* FTV
* Syndication

Smart cards and encryption|

* BISS
* Cisco Videoscape
* Conax
* Cryptoworks
* Digicipher
* HDCP
* KeyFly
* Nagravision
* PowerVu
* RAS
* SECA Mediaguard
* Viaccess
* VideoGuard

Digital video disc|

* Content Scramble System (CSS)
* Advanced Access Content System (AACS)
* BD+

DRM|

* Authorized domain
* B-CAS
* Broadcast flag
* Hardware restriction

Data security|

* Card sharing
* FTA
* Pirate decryption

Analogue broadcast encoding|

* EuroCrypt
* Videocipher
* VideoCrypt

See also free-to-view and pay television

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