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Complete solving the quadratic equation mod $2^n$

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 نشر من قبل S. M. Dehnavi
 تاريخ النشر 2017
  مجال البحث
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Quadratic functions have applications in cryptography. In this paper, we investigate the modular quadratic equation $$ ax^2+bx+c=0 quad (mod ,, 2^n), $$ and provide a complete analysis of it. More precisely, we determine when this equation has a solution and in the case that it has a solution, we not only determine the number of solutions, but also give the set of solutions in $O(n)$ time. One of the interesting results of our research is that, when this equation has a solution, then the number of solutions is a power of two.

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