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A class of randomized strategies for low-cost comparison of file copies

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2 Author(s)
Barbara, D. ; Dept. of Comput. Sci., Princeton Univ., NJ, USA ; Lipton, R.J.

A class of algorithms that use randomized signatures to compare remotely located file copies is presented. A simple technique that sends on the order of 4flog(n) bits, where f is the number of differing pages that are to be diagnosed and n is the number of pages in the file, is described. A method to improve the bound in the number of bits sent, making them grow with f as flog(f) and with n as log(n)log(log( n)), and a class of algorithms in which the number of signatures grows with f as frf, where r can be made to approach 1, are also presented. A comparison of these techniques is discussed

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Parallel and Distributed Systems, IEEE Transactions on  (Volume:2 ,  Issue: 2 )