Understanding Cryptography

From Caesar to RSA

This page collects the material related to my talk at iCSC 2011. In particular you can download all the scripts I used to play with the different ciphers yourself.

Code

• secret.htmlthe html riddle from the secure software excercise at CSC2010.
• html-riddle.cppfull break for the html riddel.
• substitution.pyencrypt a message with a substituion cipher.
• textautokey.pyencrypt a message with a text auto-key cipher.
• keyautokey.pyencrypt a message with a key auto-key cipher.
• rsa.csimple implementation for the math behind RSA.
• frequency.canalyse the letter frequency of a text.
• mostfrequent.pydetermine the most frequent letter in a text.
• coincidences.pydo a coincidence analysis.

Presentation

• Slides
• Handout
• source.tar.gzthe complete latex source for the presentation