System and method for authentication of JPEG image data
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United States of America Patent
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Apr 15, 2008
Grant Date -
Jan 22, 2004
app pub date -
Jul 22, 2002
filing date -
Jul 22, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A system and method for authentication of JPEG image data enables the recipient to ascertain whether the received image file originated from a known identified source or whether the contents of the file have been altered in some fashion prior to receipt. A unique hashing function is derived from a first section of image data contained in the JPEG compressed image in such a way that any changes subsequently made to the first section of image data is reflected in a different hashing function being derived from a signature string is embedded into a next section of the image data. Since the embedding of a previous section's integrity checking number is done without modifying the JPEG bit stream, any JPEG decoder can thereafter properly decode the image.
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