Conditional access

I want to introduct something about CG125, 70cc/90ccECMs at once. This allows the use of several
100cc Engine, Motorcycle, (BD100-4), Air Cooled,conditional access systems at the same time, a DVB
4-Stroke, Single Cylinder, Drum Brake, Gasolinefeature called simulcrypt, which saves bandwidth and
Powered, Hand Clutch, Gear Shift, Kick/Electric Start,encourages multiplex operators to cooperate. DVB
Honda Type, Japan Standard. BD100-4, MotorcycleSimulcrypt is widespread in Europe; some channels, like
100cc, 2/4-stroke, Air Cooled, Single Cylinder, Kickthe CNN International Europe from the Hot Bird
Electric Start, Hand Clutch, Five Gear Shift, Spoke Ringsatellites, can use 7 different CA systems in parallel.
Wheel, Drum Brake, CG125, Honda Type, JapanThe decryption cards are read, and sometimes
Standard Specifications: 1) Dimensions (L x W x H)updated with specific access rights, either through a
(mm): 2,020 x 730 x 1,070 2) Ground clearance (mm):Conditional Access Module (CAM), a PC card-format
140 3) Net weight (kg): 96 4) Max loading (kg): 140 5)card reader meeting DVB-CI standards, or through a
Engine type: 150FMG (single air-cool 2 stroke) 6)built-in ISO 7816 card reader, such as that in the Sky
Displacement (ml): 97 7) Start method: electric / kick 8)Digibox.
Ignition: CDI 9) Brakes (front / rear): drum / drum 10)Several companies provide competing CA systems;
Tires (front / rear): 3.00-18, 130/90-15 11) Max speedVideoGuard, Irdeto Access, Nagravision, Conax,
(km/h):Viaccess, Latens, Verimatrix and Mediaguard (a.k.a.
It has been suggested that Conditional access systemSECA) are among the most commonly used CA
be merged into this article or section. (Discuss)systems.
Conditional Access (abbreviated CA) is the protectionDue to the common usage of CA in DVB systems,
of content by requiring certain criteria to be met beforemany tools to aid in or even directly circumvent
granting access to this content. The term is commonlyencryption exist. CAM emulators and multiple-format
used in relation to digital television systems, mostCAMs exist which can either read several card
notably satellite television.formats or even directly decrypt a compromised
Conditional access in DVBencryption scheme. Most multiple format CAMs and all
Under the DVB, conditional access system standardsCAMs that directly decrypt a signal are based on
are defined in the specification documents forreverse engineering of the CA systems. A large
DVB-CA (Conditional Access), DVB-CSA (theproportion of the systems currently in use for DVB
Common Scrambling Algorithm) and DVB-CI (theencryption have been opened to full decryption at
Common Interface). These standards define a methodsome point, including Nagravision, Conax, Viaccess and
by which a digital television stream can be obfuscated,Mediaguard (v1).
with access provided only to those with validConditional access in the USA
decryption smart cards. The DVB specifications forIn the United States cable systems, the standard for
Conditional Access are available from the standardsconditional access is provided with CableCARDs
page on the DVB website.whose specification was developed by the cable
This is achieved by a combination of scrambling andcompany consortium CableLabs. Cable companies in
encryption. The data stream is scrambled with anthe US are required by the Federal Communications
8-byte secret key, called the control word. KnowingCommission to support CableCARDs, but standards
the value of the control word at a given moment is ofexist only for one way communication and do not
relatively little value, because it changes veryapply to satellite television. Next generation approaches
frequently, about every 10 seconds. The control wordin the United States eschew such physical cards and
is generated automatically and randomly, in such aemploy schemes using downloadable software for
way that successive values are not predictable; theconditional access such as DCAS. The main appeal of
DVB specification recommends using a physicalsuch approaches is that the access control may be
process for that.upgraded dynamically in response to security breaches
In order for the receiver to unscramble the datawithout requiring expensive exchanges of physical
stream, it must be permanently informed about theconditional access modules. Another appeal is that it
current value of the control word. In practise, it must bemay be inexpensively incorporated into non-traditional
informed slightly in advance, so that no viewingmedia display devices such as Portable media players.
interruption occurs. Encryption is used to protect theSee also
control word during transmission to the receiver: theAccess control, the same principle applied outside of
control word is encrypted as an entitlement controltelevision.
message (ECM). The CA subsystem in the receiverCableCARD
will decrypt the control word only when authorised toCard sharing
do so; that authority is sent to the receiver in the formCompression Networks
of an entitlement management message (EMM). TheConax
EMMs are specific to each subscriber, as identified byDigicipher 2
the smart card in his receiver, or to groups ofDigital rights management
subscribers, and are issued much less frequently thanDownloadable...(and so on) To get More information ,
ECMs, perhaps at monthly intervals. This beingyou can visit some products about parkikng space
apparently not sufficient to prevent unauthorizedsensor, silicone cllapsible filter, . The CG125, 70cc/90cc
viewing, TPS has lowered this interval down to about100cc Engine, Motorcycle, (BD100-4), Air Cooled,
12 minutes.4-Stroke, Single Cylinder, Drum Brake, Gasoline
The contents of ECMs and EMMs are notPowered, Hand Clutch, Gear Shift, Kick/Electric Start,
standardized and as such they depend on theHonda Type, Japan Standard products should be
conditional access system being used.show more here!
The control word can be transmitted through different