A little late replying :) Are you talking about dataglyph ? http://microglyph-intl.com/english/html/dataglyphs.shtml. or maybe http://en.wikipedia.org/wiki/Microdot microdot
-sandy On Wed, Jan 27, 2010 at 8:57 PM, Michael Douglas <[email protected]>wrote: > 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 >
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