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”.
August 17, 2006 · math puzzles, numbers, The Mathcast · Permalink
«« BA. The Ring is Exchanged· · · BD. Magic Numbers »»
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”.
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