How can I convert graphic files that contain hidden data?
It is possible to convert pictures that contain hidden data into other formats (BMP into GIF files for example). This file can be reconverted to its original file type (from GIF to BMP) and data can be decrypted.
Note: A conversion is a very complex task which is done differently by different programs. Before you rely on the integrity of hidden data do a test run with your graphic conversion software.
Conversion will fail if algorithms are used that accomplish compression by reduction of information. The JPEG-format for example uses the Discrete Cosines Transformation-Algorithm which compresses the picture by not saving information that the human eye can't see. Data that is hidden in such a picture will get lost upon conversion.
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