Tema: Re: SKY HD nebeliko
Autorius: Deivis <deivis @ autos . lt>
Data: 2014-06-30 13:34:59
Ant senų veikia taip pat kaip pas šarintojus, nes seni aparatai nepalaiko HD, o 
dingo tik HD šiuo metu. Visi imtuvai, kurie turėjo HD jau galėjo atsinaujinti 
ir taip pat atnaujinti kodavimo algoritmą kortose.
Šiaip kuo labiau į pabaigą tuo paprasčiau parašė :)



budulis vulgaris pretended :
> Nu nelabai ten pasisekė populiariai paaiskinti - taip ir nesupratau,
> kodėl ant senų aparatų visvien nauja schema veikia, o pas sharintojus
> nebeveikia :)
>
> 2014-06-28 23:55, Deivis rašė:
>> Šiek tiek info iš forumų, kuri populiariai paaiškina kas keitėsi ir kaip
>> keičiasi kodavimas nekeičiant imtuvų esamiems vartotojams:
>> 
>> 
>> Sky's new pairing doesn't introduce any significant differences to the
>> existing NDS data, that data is still encrypted so only a genuine card
>> can decrypt it, but what it does do is add an additional layer of
>> encryption between the box/card to prevent their cards from being used
>> in card servers like oscam or CCcam (what your c line uses to decrypt
>> channels).
>> 
>> A new HD box running the latest firmware is able to take the incoming
>> NDS data [ECMs/EMMs] from the MPEG (video) stream and further encrypt it
>> before sending it to the card.
>> 
>> An old HD box (or an SD box) just continues as it did before, extracting
>> the NDS data from the MPEG stream and feeding it to the card.
>> 
>> This design allows Sky to alter NOTHING to the existing NDS code, which
>> is essential to (a) prevent loggers/hackers from running comparators
>> over logs from the then/now data streams and (b) allow older boxes to
>> work as before.
>> 
>> Remember, the change has NOT happened at the NDS level, it has happened
>> at the firmware level of both the new HD boxes and the existing cards.
>> 
>> It's the boxes that are instructed to use the pairing algorithm [or not]
>> for a particular channel(s) [or more accurately, entitlement group/level]
>> 
>> If you place a card in a new HD box, the card will be instructed to
>> accept the newly encrypted data using the sky box's pairing key...
>> 
>> If you then move the card back to oscam, it will continue to expect that
>> encrypted data for that channel(s) and try to decrypt it...
>> Of course, as the incoming data is NOT encrypted (coming from oscam for
>> example) you'll get nothing worthwhile back..
>> 
>> So what happens when you put a card back in oscam or put it back in an
>> SD box or an old HD box and leave it..?
>> If the card is unable to verify it's running in a new HD box [after x
>> amount of time (or cycles) or following a new install/pairing process],
>> it reverts back to the original system we all know and love, which is of
>> course easy for most to share.
>> [I'm sure their lawyers have reminded Sky not to enforce a blackout on
>> paying customers for fear of prosecution or maybe Sky have acknowledged
>> some people may use their own older boxes in the event of a failure..]
>> 
>> How long Sky allow the card to revert back on the other hand is the
>> question most pay servers should be considering..
>> 
>> As it stands now the new system does nothing to prevent c/s, however,
>> once Sky are happy they have updated all the smartcards (all those EMMs
>> you've been seeing...) and have completed most (if not all) of the box
>> upgrades, expect to see some disruption.
>> 
>> When this will be, you'll have to ask the boys over at Sky (and I'm not
>> talking about their installers / customer support agents here lol)
>> 
>> Here's a quick overview of both the old and new data exchange:
>> 
>> Current:
>> ECM/EMM Data is fed to the box via the MPEG stream, it then passes it to
>> the card for a response.
>> 
>> New:
>> ECM/EMM Data is fed to the box via the MPEG stream, it then further
>> encrypts the data using a pairing key before passing it on to the card.
>> The card decrypts this in order to then decrypt and process the original
>> ECM/EMM command. The reply is then encrypted [again using the pairing
>> key] and sent back to the box, which then decrypts and executes it.
>> 
>> Both the original ECM/EMM data and the reply have not changed, the only
>> thing that has changed is the way the data was exchanged between the box
>> and the card..
>> 
>> As has been mentioned (and seemingly ignored) beforehand, it is possible
>> to use a card which has been updated to the new system by dumping the
>> key from a new HD box (pretty much in the same way you dump an RSA key
>> from a Nagra3 UK Cable box) which then allows the use of something like
>> newcs, utilising the receiver ID of course.
>> 
>> This information is not publically available as this would allow both
>> ViasatHD and SkyHD (shortly) to be shared and to be honest, many that
>> have worked on this are sick of all the exploitation...
>> 
>> Deivis

-- 
Deivis [persona], Vilnius
Passat '08 2.0 FSI / A4 '05 1.8tq