Introduction to Cryptography
Spring 2004
Examples from class

• April 7:
  • Computing a discrete log using the Pohlig-Hellman algorithm: pdf file and Mathematica notebook.
• January 23:
  • Breaking a Vigenère cipher with Friedman's index of coincidence: pdf file and Mathematica notebook.
• January 21:
  • Breaking a substitution cipher by frequency analysis: pdf file and Mathematica notebook.