On these english pages I offer some small programs in Perl, C, or Mathematica that are written (i. e. commented) in english, as well as some other material:
The german version of my Cryptology pages contains the manuscript from my lecture courses in Cryptology at the University of Mainz. For roughly equivalent material in english I recommand the crypto pages by John Savard, look here. Or have a look at Learning Cryptography.
You could also visit my Bookmarks on Cryptology (somewhat outdated - who wants to maintain extensive lists of links in the age of powerful web search engines).