Most scanners and printers have counterfeiting built in at a firmware level. On some machines it will even brick the hardware if triggered.
Adobe Photoshop: Counterfeit deterrence system
31–40 of 186 posts
Re: Adobe Photoshop: Counterfeit deterrence system
#32Earlier quoted context omitted.
The first x64 patch I ever did was to remove this very protection from Photoshop years ago. It was a single instruction patch, 1-3 bytes changed, I don't remember exactly.
Curious, as I'm totally oblivious to this - how does one patch a closed source binary to get around this protection?
The single instruction patch mentioned in the parent comment is probably changing a conditional jump (for example JE - jump if equal) into an unconditional jump, or a NOP (no operarion) instruction that does nothing, depending on if the jump leads into code we want to run or not.
Re: Adobe Photoshop: Counterfeit deterrence system
#33Earlier quoted context omitted.
The first x64 patch I ever did was to remove this very protection from Photoshop years ago. It was a single instruction patch, 1-3 bytes changed, I don't remember exactly.
Curious, as I'm totally oblivious to this - how does one patch a closed source binary to get around this protection?
JMP 0x"target"
Re: Adobe Photoshop: Counterfeit deterrence system
#34Earlier quoted context omitted.
What legitimate use case can you think of where the benefit of faithfully reproducing currency is not outweighed by the need to prevent the proliferation of counterfeit currency?
Making Monopoly money for the kids? You cannot make counterfeit currency with Photoshop. Paper money has security features that won't even convert to pixels in the first place, like holograms, transparencies and fibers embedded in the paper and such, never mind reproduce by conventional printing. This whole deterrence system is idiotic. People who accept an obviously fake printed copy of a banknote basically deserve…
At least in the US, ‘old’ bills are still legal tender. A counterfeit bill pre-holograms and recent security stuff is still usable in public.
Re: Adobe Photoshop: Counterfeit deterrence system
#35Is it legal to host an ultra high resolution image of a dollar bill?
You have to put SPECIMEN on it.
Re: Adobe Photoshop: Counterfeit deterrence system
#36More proprietary software treating their users like criminals as the default.
What legitimate use case can you think of where the benefit of faithfully reproducing currency is not outweighed by the need to prevent the proliferation of counterfeit currency?
Several artists who work on stock photography had a huge problem with this came out and they couldn’t make images of money, which are very popular for financial websites and periodicals. Go browse through Getty Images and see how many photos there are of money!
Re: Adobe Photoshop: Counterfeit deterrence system
#37Re: Adobe Photoshop: Counterfeit deterrence system
#38A few years ago I extracted the CDS logic and got it working in Linux so I could experiment with it: https://twitter.com/taviso/status/902997594460135424 I had planned to see if I could come up with an image that would still be detected even with significant distortion, and then print it on a t-shirt... The idea being you couldn't open a photograph of me in PhotoShop! :) I got sidetracked, but I should get back to th…
https://en.wikipedia.org/wiki/Free_Speech_Flag
Reminds me of the old t-shirts people sold back when the encryption key for blu-ray was cracked.
Re: Adobe Photoshop: Counterfeit deterrence system
#39Years ago I had an Austrian 5000 Schilling note in absolute mint condition. It was a beautiful note with an image of Mozart on it but it was too expensive for me to keep just to admire (~$500 USD) so I cashed it in for local currency. (Also, it had to be converted as the Schilling was being made obsolete by the Euro.)
However before I did I wanted to keep a permanent record of it so I scanned it in the highest resolution I had available (2400dpi) and processed it in an early version of Photoshop.
There were some herringbone issues which I resolved and I ended up with a truly stunning TIF image of approximately 900MB.
I never attempted to print it out as my printer was pretty mediocre and I was aware that it, like all modern printers, had anti-counterfeiting measures.
I don't know whether I was just lucky with that combination of scanner and Photoshop version. Anyway, as I mentioned the results were spectacular. Here's a low resolution image of said note (click on image for a larger size):
Re: Adobe Photoshop: Counterfeit deterrence system
#40A few years ago I extracted the CDS logic and got it working in Linux so I could experiment with it: https://twitter.com/taviso/status/902997594460135424 I had planned to see if I could come up with an image that would still be detected even with significant distortion, and then print it on a t-shirt... The idea being you couldn't open a photograph of me in PhotoShop! :) I got sidetracked, but I should get back to th…
https://en.wikipedia.org/wiki/Free_Speech_Flag Reminds me of the old t-shirts people sold back when the encryption key for blu-ray was cracked.
I still think I have my Perl DeCSS t-shirt somewhere in my mother’s basement :D