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PKI example - point me in the right direction

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I'm giving a talk that has a section on PKI -- what it is, a bit on
how it works, how strong it is, and why everybody should be using
it every day.  One of the things I want to do is a little simple
demonstration of how the math works.  I know it relies on operators
that can't be done backwards but those are complex operators.
However, other than using the modulus operator as an example of non-
reversible math and then saying "it's a little more drawn-out than
that" I'd like to generate a pair of keys and encrypt simple text
(cf. http://content.hccfl.edu/pollock/AUnixSec/PublicKeyDemo.htm)
even if its not with a good implementation of PKI.

The problme is that everywhere I go I keep running into advanced
math like Euler's totient and the psi function; and thats where the
math get's WAY above the level of my audience.  I want to go a
little past the Alice and Bob conversation and actualy show how two
prime factors are related without needing a degree to discuss it
let alone get the gist of it.

Any ideas?

Thank you,

Storge

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PKI example - point me in the right direction <Use-Author-Supplied-Address-Header@[127.1]> - 2014-04-13 01:45 +0000
  Re: PKI example - point me in the right direction "David E. Ross" <nobody@nowhere.invalid> - 2014-04-12 22:50 -0700
    Re: PKI example - point me in the right direction <Use-Author-Supplied-Address-Header@[127.1]> - 2014-04-14 01:47 +0000

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