Methodology, system and computer readable medium for detecting file encryption
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United States of America Patent
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Jul 21, 2009
Grant Date -
Oct 7, 2004
app pub date -
Apr 1, 2003
filing date -
Apr 1, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method, computer readable medium and system for determining whether a data stream is in cyphertext format statistically analyzes the data stream to compute a resultant value indicative of a level of uniformity for a frequency distribution of the data stream's byte values. When applied to one or more files an average byte value may be computed for the data stream and a chi-square statistical analysis of the data bytes performed, with the resultant value computed based on the chi-square value. The resultant is then compared to a pre-determined threshold value to determine whether the file has been encrypted. The computer-readable medium has executable instructions for reading the data stream portions of files to compute a resultant value for each file and control an output device to display appropriate output. The encryption detection system comprises a storage device, an output device and a processor programmed in accordance with the foregoing.
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