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Cache Optimized Solution for Sparse Linear System over Large Order Finite Field

  • A. K. Bhateja
  • Vaishnavi KannanEmail author
Conference paper
Part of the Communications in Computer and Information Science book series (CCIS, volume 655)

Abstract

Many mathematical, engineering and cryptographic applications require the solution of sparse linear equations over large order finite fields. The Gaussian elimination is a standard algorithm used for the above. However, its use remains limited because of its implementation difficulty for large matrices. For large and sparse linear systems the iterative Lanczos and Wiedemann are the most efficient techniques. However, the computation intensive matrix vector multiplications in these algorithms make them unsuitable for large systems, increasing the computation time due to constant accesses to the RAM and hard disk for fetching and storing data. In this paper we present a cache optimized implementation of the Lanczos and Wiedemann algorithm that can be used for very large matrices even when there is not sufficient cache to store all the non zero matrix elements. Our algorithm makes optimal use of the cache, decreases the number of memory accesses and therefore reduces the time taken for the algorithms to provide a solution. The results show an improvement of 16% in Lanczos and 13% in Wiedemann in the execution time, with number of equations as 105 and same numbers of variables over the field of order 529 bits.

Keywords

Sparse matrices Finite field Cache Lanczos algorithm Wiedemann algorithm 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2017

Authors and Affiliations

  1. 1.Defence Research and Development OrganisationNew DelhiIndia
  2. 2.Delhi Technological UniversityRohiniIndia

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