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scramble bits vs encryption

 
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chanakya
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PostPosted: Sun Apr 06, 2014 3:44 pm    Post subject: scramble bits vs encryption Reply with quote

I am pretty new to this field and would appreciate if you guide me in the right direction.

I have a text file which has got scrambled bits and need to extrract it to the original form.
Is scrambling bits different to encryption?
What tools do I need to use to extract the information?
Is there a newbie guide that helps by give steps by steps instruction how to unscramble bits?

Thanks a million..
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athulin
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PostPosted: Sun Apr 06, 2014 4:42 pm    Post subject: Re: scramble bits vs encryption Reply with quote

chanakya wrote:
I have a text file which has got scrambled bits and need to extrract it to the original form.
Is scrambling bits different to encryption?


What do you mean by 'scrambling'? How did it become 'scrambled'? Your second question suggests that it was a deliberate action -- is that correct?

What platform is the file from? Windows? Linux? Mac? What tools would normally be used to work with the file?

The original text can be recovered assuming the 'scrambling' is reversible. But without knowing exactly what you are referring to, it would only be guesswork to say definitely. One guess could be that the 'scrambling' is simply some kind of reshuffling of the original bits of the relevant parts, or perhaps the result of a reversible operation, such as an XOR.

It could also be a result of uncompressing a damaged file: if the compressed data has been damaged, it will unpack into something different from the original. Recovering the intended text would need knowledge about the compression method.

But guessing blindly is not a very good approach -- there's got to be something more to go on.

If there's not. backups are the normal way of recovering damaged file contents. If you don't have them ... too bad.

If the file is part of a file system, it might be possible to find older content in that file system.
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chanakya
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PostPosted: Sun Apr 06, 2014 4:57 pm    Post subject: Reply with quote

Hi Athulin,

Thanks for the reply.

It is an exercise in my subject. The scrambling bits needs to be restored to its original order. A text file contains the scrambled bits.

This is the first time I have looked into something like this and needed some direction as to what resources and procedure I needed to adopt.

Thanks
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PreferredUser
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PostPosted: Sun Apr 06, 2014 8:54 pm    Post subject: Reply with quote

The only bit level scrambling I am familiar with is in broadcast IEEE802.16 (cellular) and whatever the standard is for broadcast TV. There are specific algorithms that are used. I am not sure how to look at some "scrambled bits" and decide which was used.

You could Google some of the more common methods such as hybrid-ARQ or WCDMA/HSPA and see if there are any hints to be had. Good luch with that.
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athulin
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PostPosted: Mon Apr 07, 2014 12:00 am    Post subject: Reply with quote

chanakya wrote:
It is an exercise in my subject. The scrambling bits needs to be restored to its original order. A text file contains the scrambled bits.

This is the first time I have looked into something like this and needed some direction as to what resources and procedure I needed to adopt.


'Scrambling' is not a standard operation related to computer forensics, as far as I can tell. So I can't even guess at to what this may be about. In addition to the usage areas mentioned by PreferredUser, it might be related to DVD 'content scramble system', but that's not really computer forensics, either, nor do I see that there would be text file involved.

If it is a course exercise, then you should have all the relevant material already -- from your textbooks or from your teacher(s). If not, those are probably the best sources for additional information.

Goosd luck.
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