Disclaimer : This is a blog post about a CryptoParty presentation, the contents of which should not be construed as official Freeside statements. Any opinions presented in this blog post by the author do not in any way represent an official endorsement of these opinions by Freeside Technology Spaces, Inc., nor is intended to reflect the views of Freeside and its membership. Recently, Freeside hosted a CryptoParty where I gave an introductory presentation on steganography . Like all my CryptoParty presentations, this wasn't very technical, but I did introduce some (very) basic techniques. The first tool that everyone should know about is exiftool . exiftool reads and writes to the metadata section of a variety of image formats. I showed an excellent illustrated example of Exif metadata in the JPEG format, which has some great diagrams which show how a JPEG file's bytes are laid out. There's also C# .NET code included to extract and modify this data, if perl'
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