Factoring integers with large prime variations of the quadratic sieve:

Abstract: "We present the results of many factorization runs with the single and double large prime variations (PMPQS, and PPMPQS, respectively) of the quadratic sieve factorization method on SGI workstations, and on a Cray C90 vectorcomputer. Experiments with 71-, 87-, and 99-digit numbers sho...

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Bibliographische Detailangaben
Hauptverfasser: Boender, H. (VerfasserIn), Riele, Herman H. te (VerfasserIn)
Format: Buch
Sprache:English
Veröffentlicht: Amsterdam 1995
Schriftenreihe:Centrum voor Wiskunde en Informatica <Amsterdam> / Afdeling Numerieke Wiskunde: Report NM 1995,13
Schlagworte:
Zusammenfassung:Abstract: "We present the results of many factorization runs with the single and double large prime variations (PMPQS, and PPMPQS, respectively) of the quadratic sieve factorization method on SGI workstations, and on a Cray C90 vectorcomputer. Experiments with 71-, 87-, and 99-digit numbers show that for our Cray C90 implementations PPMPQS beats PMPQS for numbers of more than 80 digits, and this cross-over point goes down with the amount of available central memory. For PMPQS a known theoretical formula is worked out and tested that helps to predict the total running time on the basis of a short test run. The accuracy of the prediction is within 10% of the actual running time. For PPMPQS such a prediction formula is not known and the determination of an optimal choice of the parameters for a given number would require many full runs with that given number, and the use of an inadmissible amount of CPU-time. In order yet to provide measurements that can help to determine a good choice of the parameters in PPMPQS, we have factored many numbers in the 66 - 88 decimal digits range, where each number was run once with a specific choice of the parameters. In addition, an experimental prediction formula is given that has a restricted scope in the sense that it only applies to numbers of a given size, for a fixed choice of the parameters of PPMPQS. So such a formula may be useful if one wishes to factor many different large numbers of about the same size with PPMPQS."
Beschreibung:27 S.

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