Anytime. Come back with any questions you may have and I will do my
best to answer them. Another good read for a budding cryptologist is a
book by Simon Singh called 'The Code Book'. It gives you an
understanding of what the different types of cryptography are as well
as how they have and are used. Looking back through history with this
book shows quite clearly where systems have failed not because the
cryptographic standard was insufficient, but rather that the
implementation was insuffucient and made an otherwise strong cipher
vulnerable.

Its all in the way you do it :-)

Cheers

The Frog