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Forums > C64 Coding > EOR file coders
2008-02-22 04:42
The Shadow

Registered: Oct 2007
Posts: 304
EOR file coders

Someone once told me that it is impossible to open a file which was coded with an EOR coder. With todays machines, is there any conceivable way that an EOR coded file can be placed into a PC and descrambled?
 
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2008-02-25 07:58
AlexC

Registered: Jan 2008
Posts: 293
Quote: I would think that this is the first, but you never know... :)


I didn't have time to really look at it but peeking at decryption loop I can confirm that I've never seen it on c64 - at least not in protection code.
2008-02-25 12:22
tlr

Registered: Sep 2003
Posts: 1714
I posted the answer now.
The encryption algorithm implemented is AES-128 (ECB).
2008-02-26 22:18
AlexC

Registered: Jan 2008
Posts: 293
Quote: I posted the answer now.
The encryption algorithm implemented is AES-128 (ECB).


Damn! I whish I had more time to really take a look at it before you posted the answer. Great challenge BTW :D
2008-02-27 02:42
Quetzal

Registered: Jul 2002
Posts: 71
It seems that there are a number of us who enjoy this sort of challenge, so what I'm wondering is this: Are there any old encrypted productions that still have not had their protection broken yet? And if you know of one, post the link here so it can be seen to.
2008-02-29 18:19
AlexC

Registered: Jan 2008
Posts: 293
Quote: It seems that there are a number of us who enjoy this sort of challenge, so what I'm wondering is this: Are there any old encrypted productions that still have not had their protection broken yet? And if you know of one, post the link here so it can be seen to.


I don't think there is much left to crack - this why new releases are more fixes and crunchning, unless somebody will code a new challenge.
2008-02-29 21:05
tlr

Registered: Sep 2003
Posts: 1714
Quote: I don't think there is much left to crack - this why new releases are more fixes and crunchning, unless somebody will code a new challenge.

Something tells me you can expect one tomorrow... ;)
2008-02-29 22:42
AlexC

Registered: Jan 2008
Posts: 293
Quote: Something tells me you can expect one tomorrow... ;)

Cool - I'm working right now on something different - not encryption based code to crack but some protection based on different tricks.
2008-03-01 13:30
Ymgve

Registered: May 2002
Posts: 84
Shame on you, tlr - you uploaded Crack me too! and didn't post it here :)
2008-03-01 18:15
Ymgve

Registered: May 2002
Posts: 84
nevermind
2008-03-02 18:59
tlr

Registered: Sep 2003
Posts: 1714
Only Ymgve has cracked it.
Are you really going to let him be the only one? ;)
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