Cryptography and primes

Cryptography and primes come across, as two of my interests...

Im thinking about putting some basic codes as templates together as exercises... Maybe even do some basic RSA, eventually ?!

For now, some links

http://www.khjk.org/log/2011/apr/blindsigs.html

http://books.google.co.uk/books/about/In_Code.html?id=kyO7QgAACAAJ