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From: Torsten Kirschner <torsten.kirschner@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: X.509 certificates
Date: Sat, 24 Nov 2012 23:24:09 +0100
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Den 11/18/12 10:28 AM, skrev brawnwithbrain:
[...]
> As I am a novice programmer, I am finding it hard to answer this
 > question.
[...]
> Demonstrate the use of X.509 certificate to exchange messages that
 > achieve confidentiality.
[...]

If Google cannot help you, you may want to get a copy of this book: 
"Beginning Cryptography with Java" 
(http://www.wrox.com/WileyCDA/WroxTitle/Beginning-Cryptography-with-Java.productCd-0764596330.html), 
and look at what The Legion of the Bouncy Castle 
(http://www.bouncycastle.org/) are doing.

The book offers example code that you can download from its webpage; I 
am pretty sure all of your assignment is covered there.