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Satellite TV receivers & systems support forums
Satellite Systems - What to Buy - What to install
How is it possible to scramble channels with multiple encryptions?
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<blockquote data-quote="speculatrix" data-source="post: 51471" data-attributes="member: 177030"><p>I think the way it works, having seen some of the CI/CAM documents, is that the actual encryption algorithm is the same for the commonly used ones , but the method by which the keys are exchanged between the cards and the cams, and the updated keys are passed to the cams, is specific to each system (via, ird, sec, con... etc). This is how the old ird*o freecam can do so much. </p><p>The signal stream from the satellite identifies to the cam what type of card should be used and how to use it. A freecam and the matrix and so on remap the card commands and then when it gets the keys applies the appropriate algorithm or variation of it.</p><p></p><p>s*y/NDS use a non-standard system and they are able to change it, and thus when anyone gets close they can tweak it. They learned some hard lessons from the old analogue days.</p><p></p><p>naturally, there's a lot of secrecy, both by the companies who make the encryption systems, and by the [cough] unofficial decryption people, and you have to sign quite a lot of paperwork to get access to the core decryption information, but you can find some data on it from the ETSI, the BSI and other standards sites without having to pay anything.</p><p></p><p>Paul</p></blockquote><p></p>
[QUOTE="speculatrix, post: 51471, member: 177030"] I think the way it works, having seen some of the CI/CAM documents, is that the actual encryption algorithm is the same for the commonly used ones , but the method by which the keys are exchanged between the cards and the cams, and the updated keys are passed to the cams, is specific to each system (via, ird, sec, con... etc). This is how the old ird*o freecam can do so much. The signal stream from the satellite identifies to the cam what type of card should be used and how to use it. A freecam and the matrix and so on remap the card commands and then when it gets the keys applies the appropriate algorithm or variation of it. s*y/NDS use a non-standard system and they are able to change it, and thus when anyone gets close they can tweak it. They learned some hard lessons from the old analogue days. naturally, there's a lot of secrecy, both by the companies who make the encryption systems, and by the [cough] unofficial decryption people, and you have to sign quite a lot of paperwork to get access to the core decryption information, but you can find some data on it from the ETSI, the BSI and other standards sites without having to pay anything. Paul [/QUOTE]
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Satellite Systems - What to Buy - What to install
How is it possible to scramble channels with multiple encryptions?
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