For example a thorough academic article from 1988 about file comparisons at <a href="http://citeseer.nj.nec.com/cache/papers/cs/6985/http:zSzzSzwww.ime.usp/brzSz???zSzpapirzSzsctp.pdf/simon88sequence.pdf">http://citeseer.nj.nec.com/cache/papers/cs/6985/http:zSzzSzwww.ime.usp/brzSz???zSzpapirzSzsctp.pdf/simon88sequence.pdf</a> shows that the file comparison problem is theoretically and practically not completely solved yet, but this article deals mainly with various methods of increasing the speed of such algorithms (which is fa