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crypto
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Dabei seit: 10.08.2000
Beiträge: 395
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Nice idea. OfflineCSA uses a different approach than the famous decsa. The cws aren't read from a file but from a regular plugin. Naturally the ts needs to contain the ecm stream.
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13.08.2003 23:52 |
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[gme] ![[gme] ist männlich](images/male.gif "[gme] ist männlich")
Moderator
Dabei seit: 12.10.2002
Beiträge: 1.073
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(it is not a brute force attack or the like)
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Hmmm...maybe you want to wait about 4,5 years for every 10-90 seconds of video, I dont. This is the time you'd need to bf CSA encoded video. Assuming a keyspace of 2^48 and that you can test 10^6 CWs/second (realistic for software implementation on actual PC) and also that you have only to search half of the keyspace for statistical reasons.
This thing is a nice piece of software. I'm wondering which CSA.dll it uses (it dates 2002-12-25) - maybe the original from freedec?!
cu
[gme]
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14.08.2003 15:02 |
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SatRookie
Member
Dabei seit: 17.09.2002
Beiträge: 15
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Original von [gme]
This thing is a nice piece of software. I'm wondering which CSA.dll it uses (it dates 2002-12-25) - maybe the original from freedec?!
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No.
That dll is from not published early version of WinSTB.
Sorry that I did not include CSA code into package.
I affraid that I lost them... 8(
But I suppose that later version of CSA.dll should be compatible or require just few modifications.
BTW Offline decoder with hardcoded parameters was finished
at december. Unfortunatelly becouse of lack of time
I released it only these days.
You can look at this discussion at 21 dec 2002 and
will find mention about offline decoder. 
It takes 9 months to give live to that child.
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14.08.2003 15:27 |
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[gme]
Moderator
Dabei seit: 12.10.2002
Beiträge: 1.073
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@satrookie
I know what you're talking about. I also have something like this program, but its in a very unfinished stage. I concentrated more on improving the CSA than finishing this decoder and even there improvement is done very slow - always lack of time.
So, anyway...the main point is, you finally got to this stage and that counts.
cu
[gme]
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14.08.2003 17:05 |
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crypto
Member
Dabei seit: 10.08.2000
Beiträge: 395
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14.08.2003 21:09 |
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spitfire
Member
Dabei seit: 10.11.2000
Beiträge: 152
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great job guys!
CSA-coders unite!
you should open a CVS ;-)
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15.08.2003 21:47 |
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@SatRookie: thanks for your examples (I didn't want to slate your prog)
After reading things here http://lasecpc13.epfl.ch/ntcrack/
I got some hope on BF, but maybe the things are completely different (although the NT password encryption is not that weak)
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18.08.2003 23:32 |
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[gme]
Moderator
Dabei seit: 12.10.2002
Beiträge: 1.073
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Hi there...
There's new CSA Software to play with on csa.irde.to.
I uploaded my version of a SIMD Blockcipher and Keyscheduler. This blockcipher is capable of processing 8 Blocks (regardless if from the same packet or from different packets) with 8 independent CWs at a time. The speed-up against BC implementations I know, is about factor 2.
IMHO the "cherry on the cake" is the new keyscheduler. It is also capable of scheduling 8 different CWs at a time. As I already stated in another thread it reaches about 6Mio schedules per second on 1GHz Celeron 2.
So it might be a very useful increase in speed for people who like to play around with the blockcipher or just need to schedule that much keys in a short time 
At the moment the sourcecode contains remarks in german language, a version with remarks in english language will be available a.s.a.p.
The only thing you have to deal with if you want to use this part of software, is to get your TS Data and CWs from sequential into interleaved order. This means, if you have 8 CWs which are ordered like this
"CW1 Byte0, CW1 Byte1, ..., CW1 Byte7, CW2 Byte0, ..., CW8 Byte7" they have to be changed into an interleaved order like this:
"CW1 Byte0, CW2 Byte0, ..., CW8 Byte0, CW1 Byte1, ..., CW8 Byte7".
Its not that hard to create some code who does this conversion, but I'll leave that piece of work for you. I think thats just fair 
cu
[gme]
P.S.: In combination with the already existing SIMD Streamcipher, it should be possible to write a descrambling unit which should easily outperform all existing implementations...
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27.06.2004 19:07 |
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Old_man
Member
Dabei seit: 23.01.2002
Beiträge: 340
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Übrigens lag am Samstag auf dem '.lv'-upload eine StreamCipher.pdf.
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25.10.2004 14:19 |
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[gme]
Moderator
Dabei seit: 12.10.2002
Beiträge: 1.073
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Hi zusammen,
ich habe die Tage mal ein bisschen im Netz gestöbert und auf dieser Seite zwei Sachen über den CSA gefunden. Ich hab' sie mal überflogen und es sieht recht brauchbar aus, die eine Datei ist eine Präsentation, das andere die Zusammenfassung.
Könnte für den einen oder anderen als Grundlage recht interessant sein:
Zusammenfassung
Präsentation
cu
[gme]
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09.02.2006 19:45 |
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Geblockte Angriffe: 623 | prof. Blocks: 17.159.519 | Spy-/Malware: 1.513
CT Security System 3.0.7: © 2006 Frank John & cback.de |
| Forensoftware: Burning Board 2.3.6, entwickelt von WoltLab GmbH |
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