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# encryption

Posted on 2012-09-02
836 Views
Dear all,
I have encrypted message and resolved message, any application to generate the encryption equation?

Thanks
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Question by:ethar1

LVL 26

Assisted Solution

No application that I know can do it.

An experienced cryptanalysis might be able to.
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Author Comment

Thanks MacroShadow, do you know any? and how much it ma cost?
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LVL 2

Accepted Solution

Hi,

Go to http://www.bouncycastle.org/, It is provide lots of function, that will be used for data encryption and decryption.

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LVL 26

Expert Comment

I've never tried it, so I can't recommend anybody (if you can find a private practicing cryptanalyst) nor can I estimate a price.
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LVL 77

Assisted Solution

I am guessing you'd like the solution in this lifetime and you don't have unlimited funding.

without any idea of what might have encrypted the message you have to do multiple brute force attacks using all known encryption methods.. hopefully there is a header somewhere that will show the type of encryption used or at least narrow down the suspects.

With current encryption technology you could be looking from hours to eons using even 1000 gpu's and the solution would only be applicable for that 1 message
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LVL 9

Expert Comment

No need to reinvent the wheel, use PGP encryption.
This blog site has some extensive examples on how to go about it:
http://rafayal.blogspot.com.au/2009/06/pgp-encryption-with-c.html
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LVL 33

Assisted Solution

many encrypted messages have a fairly clear function - at base, the big two types (s/mime and pgp) reveal quite clearly their identity in their mail headers.

surely though, if you have both message and plaintext, you know what was used to decrypt it?
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LVL 77

Expert Comment

@OrcBighter:

how does encrypting a file with a known cypher-text and a plain-text give one any inkling on how the plain-text was enciphered?

I used to be in this field and 1 message cypher/plain text tells you nothing about the underlying encryption system...  a few hundred messages (the more the better) with known items, i.e. a structured message format helps immensely.
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LVL 9

Expert Comment

I misunderstood. I thought you wanted to employ encyption in your messages, hence PGP with its public and private keys.
But from your last response I take it that you want to decrypt a message you had no part in encrypting, and you want to work out how to do it.
That kind of defeats the purpose of encryption.
Still it can be done. If you have a team of mathematicians running a great number of computers in parallel, youi could probably break a 128-bit encryption code in a century or so.
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Author Comment

any application to read binary data and allow to edit it?
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LVL 77

Assisted Solution

XVI Editor.. or any other hex editor will do
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