Self-witnessing polynomial-time complexity and prime factorization |
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Authors: | Michael R Fellows Neal Koblitz |
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Institution: | (1) Department of Computer Science, University of Victoria, V8W 3P6 Victoria, B.C., Canada;(2) Department of Mathematics, University of Washington, 98195 Seattle, WA, USA |
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Abstract: | For a number of computational search problems, the existence of a polynomial-time algorithm for the problem implies that a polynomial-time algorithm for the problem is constructively known. Some instances of such self-witnessing polynomial-time complexity are presented. Our main result demonstrates this property for the problem of computing the prime factorization of a positive integer, based on a lemma which shows that a certificate for primality or compositeness can be constructed for a positive integer p in deterministic polynomial time given a complete factorization of p - 1. |
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