First of all - great to find a forum like that here ! Thanks a lot to all contributors.

My first post, attention, newby ......

Background: here in germany exists a private pay-tv company which is hacked since more then six month. They are using the nagra2 encryption system, but I think thats not the point here.

The hack is done with smartcards (basing on Chip Atmel AT90SC6464C). Currently there are 3 difernt models on the market (cerebro, didem, daytona).
Prices for this cards range between 70-100 euros.

These cards are updatet via hex files which could be dl from different ulc's.

These files are encrypted.

I personally don't use one of this cards , but today I had a closer look to one of these files for the modell daytona, cause they are publishing a sub file for annother pay-tv company which is using annother encrytion system (easytv = cryptoworks)

The point: the key easytv is using is public.

Am I right now that if I have the crypted file for the atmel card and the key (which must be included in that file) this could (theoreticaly) be attacked by a known plaintext attack ?

This is a part of the hex file:

DTCDATA1 61 4E2E
FEB0000080
56C7870DBF4DC2903A5D5B4B835F350A
2F370561D7A5CAE823E3E3A2D4DE08FC
1D26480A8C22A72027D137696433F861
495185347FF442220FC8862C95B1B37A
AFEC37EBF9534FD5F1F9047571EDA227
195C50111661521890D919B35F552346
5E26F617B3A9FFDC23E051990D78EBF3
4006FAB508D2B62D14B59A68C214AC91
FEB1000090
EE7064B2422693D4E894200C7D493E13
AB39EDA57F62


And if this could be done - are there tools out to do that job ?

Thanks

bin

If I'm understanding you correctly, the plaintext attack would probably work, the question is how many years would it take - if it's using a public key and the encryption method is known it seems to me that decrypting it would be relatively easy - but I'm not a crypto guy, you probably need to ask the question in that forum.

SiGiNT