- Samsung C460FW Toner - 3 Updates
| Jeff Liebermann <jeffl@cruzio.com>: Aug 17 10:00AM -0700 On Sun, 11 Aug 2019 16:42:29 -0700, Jeff Liebermann <jeffl@cruzio.com> wrote: >really tiny area which would hardly affect yellow toner consumption. >Machine Identification Code ><https://en.wikipedia.org/wiki/Machine_Identification_Code> Oops. I forgot to multiply by the number of times the pattern is repeated on a page. My count is 120 times for letter size paper. That would cover 480 sq-mm or 22mm x 22mm square (0.87 x 0.87 inches) maximum (if every possible dot in the pattern was printed). That's much more toner consumption than I originally estimated and would consume more yellow toner than the other colors (except maybe black). I recently inherited from a customer an HP LaserJet Pro m477fnw color laser printer: <https://www.amazon.com/HP-Color-LaserJet-M477fnw-Renewed/dp/B01N5XP9TL/> Quite good, but this particular model doesn't do double sided printing. When I picked up the printer, the yellow toner level was well below the other colors. The dots are visible with a microscope and UV illumination. Grumble... -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| danny burstein <dannyb@panix.com>: Aug 17 05:24PM In <5saglehr6h6go1vasarbjr8kq0nel672aq@4ax.com> Jeff Liebermann <jeffl@cruzio.com> writes: [snip] >well below the other colors. The dots are visible with a microscope >and UV illumination. >Grumble... Periodically, the great folk (overworked, understaffed...) at the EFF do things like: https://www.eff.org/pages/list-printers-which-do-or-do-not-display-tracking-dots -- _____________________________________________________ Knowledge may be power, but communications is the key dannyb@panix.com [to foil spammers, my address has been double rot-13 encoded] |
| Jeff Liebermann <jeffl@cruzio.com>: Aug 17 12:10PM -0700 On Sat, 17 Aug 2019 17:24:44 +0000 (UTC), danny burstein >Periodically, the great folk (overworked, understaffed...) >at the EFF do things like: >https://www.eff.org/pages/list-printers-which-do-or-do-not-display-tracking-dots More from the EFF: <https://www.eff.org/issues/printers> The encoding seems to be different for different manufacturers. After about 14 years, only the Xerox codes seem to have been fully decoded: <https://www.techdirt.com/articles/20180626/09114540109/researchers-reveal-details-printer-tracking-dots-develop-free-software-to-defeat-it.shtml> <https://www.researchgate.net/publication/325976319_Reverse_Engineering_the_Machine_Identification_Code> <https://dfd.inf.tu-dresden.de> <https://blog.erratasec.com/2017/06/how-intercept-outed-reality-winner.html#.XVhP3kd7laS> -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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