A digital flip. Introduce your classes to cryptographic protocols using and, or, and not gates. Groups create a complete circuit to convert a binary number into another one. This type of one-way function allows pupils to verify the correct pathway. The activity is the second in a three-part series on encryption.

Concepts

logic, number puzzles, functions, binary code, technology resources

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Instructional Ideas

• Use when discussing how to create codes
• Have pupils design their own circuits

Classroom Considerations

• Some individuals might have difficulty with the gates and determining the outputs

Pros

• Provides a circuit for learners to try
• Includes reading information on why cryptography is important

Cons

• Deciphering where the arrow points in the hand-drawn circuit is difficult