Read the tutorials and my notes on RSA.

Then either

 (1) Write up some C routines to do bignum arithmetic, or

 (2) Extend my code to break up a message into appropriate chunks
     and encode each chunk, or

 (3) Get the "bigint" code working with the Textbook RSA engine
     for more realistic PGP, or

 (4) Download, compile, test, and present PGP including the full
     key generation stuff.

Write up and hand in by one week from today.