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Lecture 7: Congruences, Part III

William Stein


Date: Math 124 $ \quad$ HARVARD UNIVERSITY $ \quad$ Fall 2001



Key Ideas

  1. How to solve $ ax\equiv 1\pmod{n}$ efficiently.
  2. How to compute $ a^m\pmod{n}$ efficiently.
  3. A probabilistic primality test.





William A Stein 2001-09-25