In the episode "Toxin," the FBI tracks a serial prisoner who uses contaminated drugs. The FBI intercepts an encrypted message without the encryption key and Charlie explains to Don that Information Theory and knowledge of the English language makes deciphering easier.
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 web sites and questions from the Extensions page.