Cryptographic Protocols

This is another activity that achieves something that doesn’t seem possible – people who don’t trust each other and can’t see each other are able to agree on the outcome of a random coin flip.

This is an absorbing activity for an individual student or a whole classroom.

No Coin Toss

Activity description (PDF)

Translations and other versions:


Related Resources

Curriculum Links

Great Principles of Computer Science [info]
  • Communication
New Zealand Curriculum [info]
  • Technology Level 1:Technological systems
    • Understand that technological systems have inputs, controlled transformations, and outputs.