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Two Observations on Probabilistic Primality Testing
, 1987
"... In this note, we make two loosely related observations on Rabin's probabilistic primality test. The first remark gives a rather strange and provocative reason as to why is Rabin's test so good. It turns out that a single iteration fails with a nonnegligible probability on a composite number of the ..."
Abstract

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In this note, we make two loosely related observations on Rabin's probabilistic primality test. The first remark gives a rather strange and provocative reason as to why is Rabin's test so good. It turns out that a single iteration fails with a nonnegligible probability on a composite number of the form 4j +3 only if this number happens to be easy to split. The second observation is much more fundamental because is it not restricted to primality testing: it has profound consequences for the entire field of probabilistic algorithms. There we ask the question: how good is Rabin's algorithm? Whenever one wishes to produce a uniformly distributed random probabilistic prime with a given bound on the error probability, it turns out that the size of the desired prime must be taken into account. 1. Introduction In this note, we make two loosely related observations on Rabin's probabilistic primality test. The first remark gives a rather strange and provocative reason as to why is Rabin's te...