Why are you discussing encoding in BISS only?

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cayoenrique

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475
Why GPU?
Imagine a simple worker guy name Eduard. Eduard work is to make bags that contain 100 7oz Paper Cups. No special skill needed but time consuming process. So it does not matter how fast he work he only can do so many in a day.

Now a guy name Franco decided he will make more money fast. So he build a Factory. In it he contract 1000 Eduards guys . He create 10 assembly lines of 100 Eduards. Now the Edurads do not have to count to 100 cups as in fact each one put only 1 cup in the bag. Now in genera because the factory has 1000 Edwards it can do 1 bag in 1/1000 of the time. See the point.

A core is a low quality CPU. It knows only the basic. +-/* and and how to manipulate numbers or it bits. Because is so simple, AMD/Nvidia can put 1000 core in a Chip. And like the factory it does the job 1000 times faster!!
 
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cayoenrique

Member
Messages
475
I did a quick look on NEW GPU.
Nvidia
Graphics GTX 750Ti 640 cores $150
NVIDIA GeForce GTX 1650 896 cores $180

AMD
AMD Radeon RX 580 2304 cores $90-$100
Click to expand...

See my point. In the Future when you have $$ buy Nvidia so you can use Colibri's RBT. This a most have in SAT.
_https://www.techpowerup.com/gpu-specs/geforce-gtx-750-ti.c2548
_https://www.techpowerup.com/gpu-specs/geforce-gtx-1650.c3366

_https://www.techpowerup.com/gpu-specs/radeon-rx-580.c2938
_https://www.phoronix.com/review/radeon-rx580-linux

But for testing for $100 USD you can get a nice 2304 cores that will satisfy your brute-force challenge of learning how to do other things. But once you stop testing you will fell you did waisted that money!! But a good Nvidia will be over $250 USD most likely over $300 USD

Again, First use the command I gave you to find out if you have usable internal GPU. Then decide if you whant old or new. If new then decide if $100 USD is an aceptable lost for learning. Finally think think think. Do I want to do Colibris's RBT, Than means you need to spend over $300!!!


NOTE: NOT ALL PC can accept a GPU. You may need a New Power Supply, SSD, motherboard etc. Need to do that assignment.
 
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cayoenrique

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475
I know it seems like a monologue!! Sorry.
One last IMPORTANT thing before you loose your money. I said I can teach you to understand the process of BruteForce. Why is so difficult to find a new key.

I never said you will be getting new keys of channels you interest. Most likely you will not get any keys. But you will not know, if you never try.
 
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Me2019H

Registered
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101
I'm going to buy a cheap one now to learn but before I do, is there something I need to learn first?
Let's start by understanding the process of BruteForce and what we need it for.
 
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cayoenrique

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475
Yes there are lots of things.

Lets ressume where we are at. Original objective of thread was why ONLY BISS chat/keys. So you wanted other CAS.
I gave you:
1- sources for the decryption of different CAS that you can study in oetsdec_011
2- Full ts example logs and their respective keys

Because you are new, then I told you not to try to break a CAS. Instead I told you to understand the brute-force of a key in a singular Encryption standard. I told you to start with DES. In fact DES is used by Irdeto.

Let me see if I can remember how Irdeto ECM work and try to pull an example in what to do to brute-force the ECM. If I can not do it in Irdeto we could try old EC ED type Tanberg.

See you soon.
 
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Me2019H

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101
Hello,
I see you only use 2 algorithms for encryption AES and DES, are there other algorithms
It is possible that unknown algorithms are in use, or it is impossible
 
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cayoenrique

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Messages
475
Let me see how I explained. as it is complicated or let say every CAD has a different Scheme.

1rst for most of the Conditional access system CAS the Video is encrypted in Common Scrambling Algorithm CSA. CSA was an European protocol. In America most used instead Data Encryption Standard DES. But today many are based on Advanced_Encryption_Standard AES

Other are RSA, IDEA, Triple DES, Blowfish, RC6, PGP.
Code: 
https://en.wikipedia.org/wiki/Encryption
https://en.wikipedia.org/wiki/Common_Interface
https://en.wikipedia.org/wiki/Common_Scrambling_Algorithm
https://en.wikipedia.org/wiki/Data_Encryption_Standard
https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
 
C

cayoenrique

Member
Messages
475
I am not an expert I can be wrong. And even there cases where no standard is use. Yes out of spec. And not all CAS have equal implementation

Each transponder should have a EMM stream. A receiver will search for its personal EMM in the stream. In it it will find the program it has been authorized. So each receiver my find at leas 1 ECM Key. But there are CAS that may send multiples ECM Keys depending on the list of authorized channels to be view. Once the receiver has found it new ECM Key it will then look in the ECM been sent for a particular channel it has tune. It uses the ECM Key to fine the KEY that will open the Video and Audio. In Powervu there are different keys for Video and each different Audio/Text PID.

What you really need is the Key that will open the Video. But this key is made to change normally about 5 to 10 seconds.
So you are then force to Find the ECM Key. In the past it used to not change for days. Now The key will rollover too maybe every hour or so.
So you are then force to Find the EMM Key to deal with all changes!!!
 
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cayoenrique

Member
Messages
475
So to answer your question, for video KEY most uses CSA and some uses DES.
For ECM/EMM many uses DES, 3DES or some are custom rules. I have heard of RSA, IDEA in conac. But not sure.

Code: 
It is possible that unknown algorithms are in use, or it is impossible
The correct answer is that NO they should not use unknown intead they should always Follow standards. But in reality they do as they please. For example in Powervu they created the modes. So for example MNT uses Powervu but with a MODE unknown to no one else.

Another example, A signal will claim it transmit Irdeto, send EMM + ECM but in reality the Video uses static keys. It claims it is Irdeto but it is in fact BISS. Once you know the key it never changes or last for month or years.
 
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