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?

what kind of encryption do you mean?

Hey,

blowfish, aes, ... not important

Important is only that the files are crypted with 128 key or stronger.

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.

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.

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

Any link?

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

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.

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/