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In this puzzle, learners investigate the decisions involved in linking a network between houses in a muddy city.

This activity about cryptographic techniques illustrates a situation where information is shared, and yet none of it is revealed.

In this technology activity, learners explore digital imaging and pixels. Learners "transmit" an image to a partner by creating an image on grid paper.

In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.