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<p>A class of algorithms that use randomized signatures to compare remotely located filecopies is presented. A simple technique that sends on the order of 4/sup f/log(n) bits,where f is the number of differing pages that are to be diagnosed and n is the number ofpages 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 ofalgorithms in which the number of signatures grows with f as fr/sup f/, where r can bemade to approach 1, are also presented. A comparison of these techniques is discussed.</p>
Index Termsrandomized strategies; file copies; randomized signatures; remotely located file copies;differing pages; algorithm theory; file organisation; security of data

R. Lipton and D. Barbará, "A Class of Randomized Strategies for Low-Cost Comparison of File Copies," in IEEE Transactions on Parallel & Distributed Systems, vol. 2, no. , pp. 160-170, 1991.
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