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  4. On the Use of the Negation Map in the Pollard Rho Method
 
conference paper

On the Use of the Negation Map in the Pollard Rho Method

Bos, Joppe Willem
•
Kleinjung, Thorsten  
•
Lenstra, Arjen K.  
2010
Algorithmic Number Theory
9th International Symposium on Algorithmic Number Theory

The negation map can be used to speed up the Pollard rho method to compute discrete logarithms in groups of elliptic curves over finite fields. It is well known that the random walks used by Pollard rho when combined with the negation map get trapped in fruitless cycles. We show that previously published approaches to deal with this problem are plagued by recurring cycles, and we propose effective alternative countermeasures. As a result, fruitless cycles can be resolved, but the best speedup we managed to achieve is by a factor of only 1.29. Although this is less than the speedup factor of root 2 generally reported in the literature, it is supported by practical evidence.

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Type
conference paper
DOI
10.1007/978-3-642-14518-6_9
Web of Science ID

WOS:000286148700009

Author(s)
Bos, Joppe Willem
Kleinjung, Thorsten  
Lenstra, Arjen K.  
Date Issued

2010

Publisher

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa

Published in
Algorithmic Number Theory
Series title/Series vol.

Lecture Notes in Computer Science; 6197

Start page

66

End page

82

Subjects

Pollard's rho method

•

fruitless cycles

•

negation map

•

Elliptic Curve Cryptosystems

•

Factorization

•

Computation

•

Search

Editorial or Peer reviewed

NON-REVIEWED

Written at

EPFL

EPFL units
LACAL  
Event nameEvent placeEvent date
9th International Symposium on Algorithmic Number Theory

Nancy, FRANCE

Jul 19-23, 2010

Available on Infoscience
March 29, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/65771
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