| 摘要 |
A method and system for determining whether first and second byte streams are different. The method and system are very well suited for identifying and approximately quantifying changes to Web sites. Generally, the method comprises the steps of providing a first a k1 byte long sequence of characters ci for i values from i=1 to k1; providing a second a k2 byte long sequence of characters cj for j values from j=1 to k2; and computing a modulo arithmetic operation on said i values, and computing said modulo arithmetic operation on said j values. A value N1 is computed according to a formula that combines said modulo operation on i and each said character ci for i=1 to k1 using arithmetic or logical operations; and a value N2 is computed according to said formula by combining said modulo arithmetic operation on j and each said character cj for j=1 to j=k2. These N1 and N2 values are then compared to determine whether the first and second byte sequences are different. With the preferred embodiment of this invention, the procedure is used to create a number suitable for detecting and approximately quantifying changes to a byte sequence.
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