Just an FYI in case anyone was interested: if you're printing something potentially clandestine, be careful about where you print it.
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Or just print out random yellow dots on the pages first, then feed it back in again for the print run.
@SuperMoosie @vkc this is a toolkit that can do exactly that - https://github.com/dfd-tud/deda
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Just an FYI in case anyone was interested: if you're printing something potentially clandestine, be careful about where you print it.
@vkc Alternate solution, maybe: get 3 printers, print a bunch of tiny yellow dots randomly on two of them, then the actual document on the third.
Assuming the printers put the data in the same place every time, that should corrupt it, I'd imagine.
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@vkc Alternate solution, maybe: get 3 printers, print a bunch of tiny yellow dots randomly on two of them, then the actual document on the third.
Assuming the printers put the data in the same place every time, that should corrupt it, I'd imagine.
@mausmalone I was thinking something like that, but I'm imagining you need three of *the same model printer* in order to sufficiently deal with it. Alternatively the encoding might be robust enough to detect through that.
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Just an FYI in case anyone was interested: if you're printing something potentially clandestine, be careful about where you print it.
@vkc
Maybe becouse of that is why you can't print in black if you dont have color ink? -
Just an FYI in case anyone was interested: if you're printing something potentially clandestine, be careful about where you print it.
@vkc yes. as a privacy person, our personal opinion is that you should assume all modern printers have a system of this nature, although it hasn't been a focus of active research in some years
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@ozzelot hmmm, I wonder if that's why someone still uses it
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Just an FYI in case anyone was interested: if you're printing something potentially clandestine, be careful about where you print it.
@vkc Sometimes I want to make a CUPS compatible plotter using steppers and a bic pen.
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@vkc Sometimes I want to make a CUPS compatible plotter using steppers and a bic pen.
@socketwench yes!!!!!
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@ozzelot hmmm, I wonder if that's why someone still uses it
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@vkc @Kiloku As a kid, a friend and I ran a small neighborhood newspaper. We talked businesses into advertising in it, and distributed it in a maybe 10 block area because many people needed birdcage liner, and also because who didn't want to read a review of a TV show by a kid?
We talked the bowling alley into letting us use their mimeograph machine in exchange for an ad placement.
Mmmm. Mmmmimeograph smell.
@steter @vkc @Kiloku
When I was a kid my mom was a school teacher. She made her own mimeograph gel in a cookie sheet and printed handouts and tests for her classes. I’d help her with the very laborious printing, laying one sheet of paper down at a time and gently brushing the back of the sheet with a ruler. Then you peel it off and lay it down on the ping pong table. -
@vkc yes. as a privacy person, our personal opinion is that you should assume all modern printers have a system of this nature, although it hasn't been a focus of active research in some years
@ireneista @vkc hmm, I keep thinking about replacing my printer that stopped working, so I don’t have to go to the shop and spend $5 every time I need to print something, but maybe I should stick with the shop printer
(As infrequently as I need to print things I’m probably saving money anyway)
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@ireneista @vkc hmm, I keep thinking about replacing my printer that stopped working, so I don’t have to go to the shop and spend $5 every time I need to print something, but maybe I should stick with the shop printer
(As infrequently as I need to print things I’m probably saving money anyway)
@ShadSterling @vkc the shop for sure has a record of your legal identity as well, and since nobody has figured out what data is inside the steganography, it could plausibly include a timestamp. so, it's a valid option but don't make any strong assumptions about how safe you are or aren't.
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@vkc I was completely unaware, and yet I am not surprised.
@lebout2canap I only knew about it because it came up in the context of a court case where someone had been printing and mailing threatening letters to themself.
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Just an FYI in case anyone was interested: if you're printing something potentially clandestine, be careful about where you print it.
@vkc Printing on some laser safe acetate can help to make the tracking dots fairly visible. Or at least, when I've been making a 3d printed badges, it's been pretty easy to see the blocks of dots covering the page.
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Just an FYI in case anyone was interested: if you're printing something potentially clandestine, be careful about where you print it.
@vkc I was there the day Seth Schoen figured this out, at the old EFF offices on Shotwell Street in the Mission.
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@vkc I was there the day Seth Schoen figured this out, at the old EFF offices on Shotwell Street in the Mission.
@pluralistic @vkc that's really cool!
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Just an FYI in case anyone was interested: if you're printing something potentially clandestine, be careful about where you print it.
@vkc
I wonder if (some) 3d printers do the same.By the way there are way there are ways to try identify single camera sensors:
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@ireneista @vkc hmm, I keep thinking about replacing my printer that stopped working, so I don’t have to go to the shop and spend $5 every time I need to print something, but maybe I should stick with the shop printer
(As infrequently as I need to print things I’m probably saving money anyway)
@ShadSterling@mastodon.social @ireneista@adhd.irenes.space @vkc@linuxmom.net generally the data included in every print is a timestamp and serial number.
if you want a modern-ish inkjet printer that's hard to trace, i'd buy one from a thrift store with cash, and never connect it to a network. the serial will then be much harder to trace all the way to you. just make sure the computer it's being plugged into is airgapped, and ideally has the time set wrong too. -
@ShadSterling@mastodon.social @ireneista@adhd.irenes.space @vkc@linuxmom.net generally the data included in every print is a timestamp and serial number.
if you want a modern-ish inkjet printer that's hard to trace, i'd buy one from a thrift store with cash, and never connect it to a network. the serial will then be much harder to trace all the way to you. just make sure the computer it's being plugged into is airgapped, and ideally has the time set wrong too.@eri @vkc @ShadSterling wait, did somebody figure out the format??? we assumed it was still indistinguishable from random noise
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Just an FYI in case anyone was interested: if you're printing something potentially clandestine, be careful about where you print it.
@vkc so what you're telling me is I should print off my butt pics at the post office?
