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

In this online version of the classic paper and pencil game, learners practice looking ahead to anticipate an opponent's move.

In this number puzzle/trick, learner #1 thinks of a number between 1 and 63. Learner #2 shows learner #1 six cards and asks them whether the cards contain their number.