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SunBeam I post too much
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Joined: 25 Feb 2005 Posts: 4023 Location: Romania
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Posted: Sat Sep 08, 2007 4:53 am Post subject: |
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@bronox: It is hard for us. It is easy for you (20 secs, right - you already know what to do SINCE YOU MADE IT). Stop posting passworded archives. The only way to go at them is brute-forcing, as I doubt anyone can have a go at RAR's RSA algo. If it were that simple, you'd see tutorials or patches for RAR archives all over the internets!
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zart Master Cheater
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Joined: 20 Aug 2007 Posts: 351 Location: russia
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Posted: Sat Sep 08, 2007 9:18 am Post subject: |
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Ehhh what he is talking about it he used stenography to put somehting in the picture. To see if you "got the right password" you can enter it into the rar file and see if it works.
It's still not too easy since we don't have the original file he used to stenography. We havea gif version, not his converted to jpeg. He could have used any program to convert it with nearly any settings.
The biggest challange is to find out what he used, and what settings where used. Then when you have a copy of the "original" with no stego, you can easily extract the password scheme. Then you have to crack it.
So it's like you gave us a map to from point A to B. But all we know is what country it's in - and can see point B. We have no idea where to start, just what the result looks like.
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zart Master Cheater
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Joined: 20 Aug 2007 Posts: 351 Location: russia
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Posted: Sun Sep 09, 2007 9:33 am Post subject: |
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Talix wrote: | I thought cryptography only worked on jpegs, so thats one reason why its not gif. |
You *can* do it in gif's though it's much harder and usually has to be done by hand. JPEG is a lossless format so it's much easier to do it in this.
My point was that there are a million and one ways to convert the gif format to jpeg, without know how they performed this it's pretty hard to get an "original" jpeg
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TheSorc3r3r I post too much
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Joined: 06 Sep 2006 Posts: 2404
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Posted: Sun Sep 09, 2007 11:49 am Post subject: |
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How does RAR password protection work?
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appalsap Moderator
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Joined: 27 Apr 2006 Posts: 6753 Location: Pakistan
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Posted: Sun Sep 09, 2007 11:53 am Post subject: |
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It encrypts the file using the password as a key. The rar header contains a crc of the correctly decrypted file. When you enter a password it decrypts the contents with the password as a key and compares the crc of the decrypted files against the correct crc. If they don't match, you have garbage and it notifies you that the crc doesn't match.
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