If you do not require an optical scanner then I guess a barcode could look a lot less like a traditional black and white one, so making it harder to detect with the naked eye. If you divide each bar into a %age of the image width and use the largest RGB component value then you could have a multi-colour barcode with some tolerance to resizing. Shrinking is obviously going to reduce the amount of information and may be lossy but enlargement ought to be OK.
Jim 2010/1/27 Adrian Crenshaw <[email protected]> > Bar codes could work, but I want only the computer to see the stego, not a > human. If I use a barcode, won't it show to the user? > > Thanks, > Adrian > > > On Wed, Jan 27, 2010 at 10:47 AM, Rob Fuller <[email protected]> wrote: > >> Agreed about the EXIF data, but are you only talking about binary >> steganography? You can hide barcodes in images pretty simply that >> would survive resizing just fine. Also, are you talking human or >> computer legible stego? Peoples choice of stego is highly dependent on >> message size,message contents, repetition, and placement. >> >> -- >> Rob Fuller | Mubix >> Room362.com | Hak5.org | TheAcademyPro.com >> >> >> >> On Wed, Jan 27, 2010 at 7:42 AM, Jim Halfpenny <[email protected]> >> wrote: >> > Image metadata may survive (EXIF, copyright strings), it really depends >> on >> > how the program manipulating the image handles the image and metadata >> parts >> > of the file. Chances are if the hidden data is in the image data then it >> > will not survive resizing, changes to colour deptt, colour maps etc. >> > >> > Jim >> > >> > 2010/1/27 Adrian Crenshaw <[email protected]> >> >> >> >> Hi all, >> >> Does anyone know of any image based steganography that survives >> >> resizing of the image? I'm looking into using blind drops, but many >> sites >> >> alter images that they post. >> >> >> >> Thanks, >> >> Adrian >> >> >> >> _______________________________________________ >> >> Pauldotcom mailing list >> >> [email protected] >> >> http://mail.pauldotcom.com/cgi-bin/mailman/listinfo/pauldotcom >> >> Main Web Site: http://pauldotcom.com >> > >> > >> > _______________________________________________ >> > Pauldotcom mailing list >> > [email protected] >> > http://mail.pauldotcom.com/cgi-bin/mailman/listinfo/pauldotcom >> > Main Web Site: http://pauldotcom.com >> > >> _______________________________________________ >> Pauldotcom mailing list >> [email protected] >> http://mail.pauldotcom.com/cgi-bin/mailman/listinfo/pauldotcom >> Main Web Site: http://pauldotcom.com >> > > > _______________________________________________ > Pauldotcom mailing list > [email protected] > http://mail.pauldotcom.com/cgi-bin/mailman/listinfo/pauldotcom > Main Web Site: http://pauldotcom.com >
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