BD. Magic Numbers
We discuss a neat trick involving powers, mod a pair of primes.
Archive for August, 2006
BC. Casting Out Nines
How do modern “trap-door” encryption schemes work? Over the next three weeks we'll explain, but to warm up, we talk about the medieval practice of “casting out nines”.
BA. The Ring is Exchanged
Peter Winkler answers his puzzle set in the Land of Kleptomaniacs, and we chat about Martin Gardner. We'll pose another puzzle next week!
AZ. Another puzzle from Peter Winkler
We answer last week's puzzle and Peter Winkler asks how to send a ring through the land of the kleptomaniacs.
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