In "Assassin," Agent Don Eppes has intercepted a coded messaget that he brings to his brother, Charlie, for decrypting. Charlie recognizes the code as a cipher (a code that substitutes letters for other letters or small groups of letters), and realizes that a computer is not needed to break it.
Before the Activity
Download the attached PDF and look over the Teacher Page.
During the Activity
Discuss the materials from the Student Page with your class.
After the Activity
Encourage students to explore websites and questions from the Extensions page.