RE: cryptography

From: Cushing, David (
Date: 03/26/02

Date: Tue, 26 Mar 2002 14:55:27 -0500
From: "Cushing, David" <>
To: "Brannon Wilson Smith" <>, "davie elliott" <>


Were you looking to secure client/server communications?

A common programming solution for this requirement would be to use
OpenSSL ( for c++ or JSSE
( for Java.

You don't need to be an expert on the underlying algorithms to work with
the libraries. You will have to gain a basic understanding of X.509
certificates, or follow examples like a monkey and hope for the best!

The basic gist is:
* Create certificates for the client(s) and server(s)

* Add code to use the certs and validate the other end of the
connection. (Follow examples).

* Protect your private key files. These are usually password protected.

Here are some relevant articles:


> -----Original Message-----
> From: Brannon Wilson Smith []
> Sent: Monday, March 25, 2002 1:17 PM
> To: davie elliott
> Cc:
> Subject: Re: cryptography
> There is definitely more to encryption than one algorithm.
> AFAIK, most
> banks are using triple DES at the moment. RSA is a popular
> algorithm, but
> there are a few problems with it (for you): 1) you must be
> able to pick
> large primes, which means you need to know fermat's little
> theorem as well
> as having some sort of large integer class, 2) you must be
> able to pick
> and encryption exponent appropriately, which is more
> computation. You can
> search for RSA online, and you'll find some reasonable explanations.
> DES employs left-right shifts, and an arbitrarily chosen function and
> key. It's tough to explain, but there are a lot of places online that
> have good explanations. Again, there's a problem that you
> need a large
> integer class.
> Good luck.
> --Brannon Smith
> On Sat, 23 Mar 2002, [iso-8859-1] davie elliott wrote:
> > I was wondering if I could get a little information
> > please.
> >
> > I have to do a huge program at the end of my course
> > and I was thinking about making a bank program. I
> > would like to make it as realistic as possible, so I
> > have had a look at some encryption algorithms.
> > However, one of my lecturers has told me that there is
> > more to encrytion than just one algorithm. I was
> > wondering if anyone can give me a few sites or point
> > me in the right direction so that I can reaserch into
> > encrytpion deeper.
> >
> > Thank you
> >
> > P.S. someone posted a couple of sites a while back on
> > cryptography, but I had to format before I got chance
> > to view them. I would e greatful if that person could
> > repost them.
> >
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Relevant Pages

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