“91974˙CH03˙final” 2012/12/14 14:15 page 83 #1
Codes and Other Secrets
3.1 Objectives
To introduce the string data type
To demonstrate the use of string methods and operators
To introduce simple cryptographic algorithms
3.2 Introduction
For almost as long as people have been writing, people have also been trying to hide
what they were writing from others. Herodotus describes the use of “secret writing” that
saved Greece from being conquered by Xerxes and the Persians. The Kama Sutra, based
on writings dating back to the fourth century bce, instructs women in the art of secret
writing in order to hide the details of their liaisons. ...

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