🚀 go-pugleaf

I've been following the discussions on this group for about 2 weeks
by now. While the subject is interesting, the problem I face (as
a novice) is that the discussions are two complex for me to 
actually understand what is going on.
I was wondering if anybody could point me to some reference
materials where the basics of Encryption/Decryption are 
discussed. I would prefer documents availible via FTP since
I have no ready access to an extensive technical library.

I have a CS background so technical material should be OK as
long as it doesn't require a MS in math.

Thank you very much
--> Robert