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Informally, an algorithm is a set of explicit instructions used to solve a problem (e.g. Euclid's algorithm for computing the greatest common divisor of two integers). For more specific questions on algorithms, this tag may be used in conjunction with the approximation-algorithms, algorithmic-randomness and algorithmic-topology tags.

2
votes
If you need your random sequence unpredictable in a cryptographic sense, then take a look at the article How to Encipher Messages on a Small Domain: Deterministic Encryption and the Thorp Shuffle pre …
answered Jul 21 '10 by Someone
5
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Take a look at these papers from Dan Bernstein. It's not quite what you are looking for, but he does even more than you need in time $n(\lg n)^{2+o(1)}$ where $n$ = number of bits of $N\cdot d$ (one o …
answered May 6 '10 by Someone