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Index > Windows > [Delphi/ASM] way to decrypt files sync on CD/DVD or harddisc

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Hp



Joined: 03 Jul 2004
Posts: 16
Hp
Hello,

i found no way with delphi to decrypt (encrypted data) resident from
a CD/DVD or hard disc.

I would like code a small driver that decrypt data from a cd/DVD ...
direct. The data are crypted bud if a program read this crypted
files out than the driver give right decrypted files out?

Where I can get information about this way?
Delphi and ASM, or there a way with Delphi alone?
Post 17 May 2007, 18:41
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
what kind of encryption do you mean?
Post 17 May 2007, 21:06
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Hp



Joined: 03 Jul 2004
Posts: 16
Hp
Hey,

blowfish, aes, ... not important

Important is only that the files are crypted with 128 key or stronger.
Post 18 May 2007, 11:04
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Garthower



Joined: 21 Apr 2006
Posts: 158
Location: Ukraine
Garthower
You can't write with symply way a driver with Delphi, only with ASM or/and C/C++. For example, you can write driver for access to hard disk with ASM, and GUI with encrypti/decrypt operations with Delphi. If you understand C, maybe this can help you: http://www.truecrypt.org/. Perfect free program written on C with sources.
Post 18 May 2007, 14:59
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Hp



Joined: 03 Jul 2004
Posts: 16
Hp
Hey,

thank you for your answer.
How long (hours) you think that are work of the driver alone?
Is this a large project or small.

What you think? If writting GUI in delphi.
Post 18 May 2007, 16:45
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
Quote:
Important is only that the files are crypted with 128 key or stronger.

strength of key is not given just by number of bits. 1024 bit RSA key is weak, but 512 bit SHA key is more than enough
Post 20 May 2007, 15:44
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Quote:
1024 bit RSA key is weak
Surprised Any link?
Post 20 May 2007, 16:20
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
well, it's the lowest bound for RSA, quickly becoming too weak.

It's not yet practically crackable, but nothing to consider for future (in manner of years)

http://www.rsa.com/rsalabs/node.asp?id=2004
Post 20 May 2007, 16:58
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Garthower



Joined: 21 Apr 2006
Posts: 158
Location: Ukraine
Garthower
Hp wrote:
Hey,

thank you for your answer.
How long (hours) you think that are work of the driver alone?
Is this a large project or small.

What you think? If writting GUI in delphi.


If you have an exp to write file system's drivers, It will be not so long project, about one week with debugging. If you have not an exp, it's too complex to calculate time of its development.
Post 21 May 2007, 08:22
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Filter



Joined: 08 Oct 2006
Posts: 67
Filter
There is a utility with source in C++ Builder (I think) and since it uses the VCL too it might be of some help. Try... http://www.acrypt.com/
Post 04 Jul 2007, 19:36
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