I use ciphers and codes in my Computer Science classes as discussion topics and lab topics. There are many different types of ciphers. Codes are a big part of our everyday life and have been a big part of our history. Students relate to these topics and enjoy discussing them.
I presented a Model Classroom session at the TCEA State Convention on February 11 over Ciphers and Codes.
Ciphers and Codes materials will be included in the new 2010-2011 A+ Computer Science Curriculum which contains labs with solutions, slides with examples, quizzes, tests, and related materials.