who can give me a lmplement of Diffie-Hellman key exchange.

C or C++ version,os independent,can be used
under linux and windows.
Thanks for advanced.

On Thu, 15 Dec 2005 15:21:37 +0800, say88 wrote:

> C or C++ version,os independent,can be used
> under linux and windows.
> Thanks for advanced.


Key exchange should be by floppy, or newer method, hand to to hand, face
to face, person to person. ... should not be by e-mail, etc., which would
defeat the whole security model.

Implementation is very simple: hand to hand in physical media.

Best wishes.

You are the second person who suggests me implementing it by myself.
So,It seem I should implement it.
Thanks for your suggestion.

^_^


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> On Thu, 15 Dec 2005 15:21:37 +0800, say88 wrote:
>
> > C or C++ version,os independent,can be used
> > under linux and windows.
> > Thanks for advanced.
>
>
> Key exchange should be by floppy, or newer method, hand to to hand, face
> to face, person to person. ... should not be by e-mail, etc., which would
> defeat the whole security model.
>
> Implementation is very simple: hand to hand in physical media.
>
> Best wishes.

say88 wrote:

> C or C++ version,os independent,can be used
> under linux and windows.
> Thanks for advanced.

Consider the libraries OpenSSL, or LibTomCrypt, or Crypto++.
Note that NSA seems partial to elliptic-curve-based
algorithms:
(http://www.nsa.gov/ia/industry/crypt...?MenuID=10.2.7)

Given a big-integer library, Diffie-Hellman is not hard
to implement, but look at a good reference like Ferguson
and Schneier's "Practical Cryptography" to make sure you've
avoided all the gotchas.

--
Peter Pearson
To get my email address, substitute:
nowhere -> spamcop, invalid -> net

> C or C++ version,os independent,can be used
> under linux and windows.
> Thanks for advanced.

The math is pretty straightforward for basic DH. Where to find the code...
OpenSSL and PuTTY both come to mind since I know they both do DH key
exchange and have open source code.

--
Jem Berkes
Software design for Windows and Linux/Unix-like systems
http://www.sysdesign.ca/