Jim you hit the nail on the head... you can be VERY creative with how you hide bar codes.
I'm unable to find the example, but I saw a freaking amazing one that was done as background element... but before you yawn... it was hidden as shadows to someone's hair! I can't believe I can't find this... grr. (any cloud source help?) I'm sure there's other good examples to be found too. - Mick On Wed, Jan 27, 2010 at 11:56 AM, Jim Halfpenny <[email protected]> wrote: > 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 > > > _______________________________________________ > 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
