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good morning Im John Ortiz Im here to talk about advanced steganography advanced JPEG steganography and detection okay all right so one of these two images has about 69 thousand bytes hidden in it out of a file size about 330 thousand bytes which is about 20% of the file so we can take a closer look that did the lights a little bit for this one so this is the picture on the left theres a picture on the right left right looking at it closely especially like if you look above the eye you might be able to see slight differences but theres no way you can tell that one of them has hidden data the other one does not and thats the hidden data just just an image you can actually hide anything inside of a jpg whatever you want to hide so heres what well talk about today well overview the JPEG algorithm then how to exploit it for hiding I think Ive got about ten different techniques to talk about and then how to detect exploited JPEGs and then if we have time well do a demonstration I