Abstract
At present, MD5 algorithm is commonly used in the file transfer system to conduct the tests of file integrity, but when a file is too large, it will take a long time to generate MD5 code for the whole file, with the result of reducing the transmission efficiency of the file. Based on this conduction, a fast algorithm of file integrity detection is provided, which can generate MD5 code with the file size and some random content of the file. Although the algorithm cannot test files roundly, it is integrated into the file transfer system. The test results show that this algorithm can detect the file integrity faster, and when the file is damaged or tampered with, the probability of detecting changes of the file content is higher than the theoretical value. The algorithm has great value in engineering applications.
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