This pages contain (large parts of) the manuscript from my lecture course in Cryptology at the University of Mainz. They are mainly written in german. For roughly equivalent material in english I recommand the crypto pages by John Savard, look here.
You could also visit my Bookmarks on Cryptology.
Here I offer some small programs in Perl or C that are written (i. e. commented) in english as well as some other material:
EMail to Pommerening@imsd.uni-mainz.de.