Explained the RSA public key cryptosystem. <br>
      <br>
For more background on the RSA cryptosystem take a look at the
wikipedia page <a
 href="http://en.wikipedia.org/wiki/RSA_%28cryptosystem%29">here</a>.


<br><br>It is worth considering, with the benefit of hindesight, the following quote<br>
      <br>
"both Gauss and lesser mathematicians may be justified in rejoicing
that there is one science at any rate [number theory], and that their
own, whose
very remoteness from ordinary human activities should keep it
gentle and clean."<br>
      <br>
from G.H. Hardy's <b> A Mathematician's Apology</b>. This short book
is well worth a read and is available online <a
 href="http://www.math.ualberta.ca/mss/misc/A%20Mathematician%27s%20Apology.pdf">here</a>.