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EURion only works on flat services (photocopiers and scanners). Photoshop detects currency based on a Digimarc watermark, which you can't generate without payin

by dsl 8y ago

EURion only works on flat services (photocopiers and scanners). Photoshop detects currency based on a Digimarc watermark, which you can't generate without paying a licensing fee.

wolfgke 8y ago
> Photoshop detects currency based on a Digimarc watermark, which you can't generate without paying a licensing fee. Sounds like a challenge for hackers. :-)
- userbinator 8y ago
  I'm sure at least one person in the world has reverse-engineered the algorithm, and it might be quite simple, but the legal implications prevent its publication. If anything, it would be more likely to be on the dark web.
deleted 8y ago
[deleted]
weinzierl 8y ago
> Photoshop detects currency based on a Digimarc watermark, which you can't generate without paying a licensing fee. You can't generate your own without paying a licensing fee. Nothing[§] prevents you from extracting existing watermarks and applying them to other things. This is called a copy attack. There are mitigations[1] but I believe they are not practical for banknotes. I've been told by a Digimarc representative in private conversation about the mentioned paper, that "The Digimarc for Images solution does not utilize the exact functionality described in the paper [..]". This was in 2011, I don't know if things have changed. [§] Ok, nothing technical at least; legally it's a different matter... [1] https://www.digimarc.com/docs/default-source/technology-resources/published-technical-papers/commercial-applications/dmrc_image_signatures.pdf https://www.digimarc.com/docs/default-source/technology-reso...
- dsl 8y ago
  The current research in to the Digimarc currency watermark has determined an absolute minimal test case [1], however no one has discovered the exact watermarking mechanism. I was speaking in absolutes because we can't do a copy attack without knowing what features to extract. Someone has enumerated all the detected regions on the 20 pound note [2] if you'd like to take a stab at it! 1. https://murdoch.is/projects/currency/cropped.png https://murdoch.is/projects/currency/cropped.png 2. https://murdoch.is/projects/currency/small_crops.png https://murdoch.is/projects/currency/small_crops.png
  - ryanlol 8y ago
    I don't know anything about Digimarc, but it looks like this tool may allow you to create watermarks as other people using the official digimarc software https://github.com/flarn2006/DigimarcPIN/ https://github.com/flarn2006/DigimarcPIN/

by dsl 8y ago

EURion only works on flat services (photocopiers and scanners). Photoshop detects currency based on a Digimarc watermark, which you can't generate without paying a licensing fee.

wolfgke 8y ago

> Photoshop detects currency based on a Digimarc watermark, which you can't generate without paying a licensing fee. Sounds like a challenge for hackers. :-)

userbinator 8y ago
I'm sure at least one person in the world has reverse-engineered the algorithm, and it might be quite simple, but the legal implications prevent its publication. If anything, it would be more likely to be on the dark web.

deleted 8y ago

[deleted]

weinzierl 8y ago

> Photoshop detects currency based on a Digimarc watermark, which you can't generate without paying a licensing fee. You can't generate your own without paying a licensing fee. Nothing[§] prevents you from extracting existing watermarks and applying them to other things. This is called a copy attack. There are mitigations[1] but I believe they are not practical for banknotes. I've been told by a Digimarc representative in private conversation about the mentioned paper, that "The Digimarc for Images solution does not utilize the exact functionality described in the paper [..]". This was in 2011, I don't know if things have changed. [§] Ok, nothing technical at least; legally it's a different matter... [1] https://www.digimarc.com/docs/default-source/technology-resources/published-technical-papers/commercial-applications/dmrc_image_signatures.pdf https://www.digimarc.com/docs/default-source/technology-reso...

dsl 8y ago
The current research in to the Digimarc currency watermark has determined an absolute minimal test case [1], however no one has discovered the exact watermarking mechanism. I was speaking in absolutes because we can't do a copy attack without knowing what features to extract. Someone has enumerated all the detected regions on the 20 pound note [2] if you'd like to take a stab at it! 1. https://murdoch.is/projects/currency/cropped.png https://murdoch.is/projects/currency/cropped.png 2. https://murdoch.is/projects/currency/small_crops.png https://murdoch.is/projects/currency/small_crops.png
- ryanlol 8y ago
  I don't know anything about Digimarc, but it looks like this tool may allow you to create watermarks as other people using the official digimarc software https://github.com/flarn2006/DigimarcPIN/ https://github.com/flarn2006/DigimarcPIN/