Talk:Printer steganography

Typography High‑importance

	This redirect is within the scope of WikiProject Typography, a collaborative effort to improve the coverage of articles related to Typography on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.TypographyWikipedia:WikiProject TypographyTemplate:WikiProject TypographyTypography
High	This redirect has been rated as High-importance on the importance scale.

Technology

This redirect is within the scope of WikiProject Technology, a collaborative effort to improve the coverage of technology on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.TechnologyWikipedia:WikiProject TechnologyTemplate:WikiProject TechnologyTechnology

Computing: Security Mid‑importance

This redirect is within the scope of WikiProject Computing, a collaborative effort to improve the coverage of computers, computing, and information technology on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ComputingWikipedia:WikiProject ComputingTemplate:WikiProject ComputingComputing

Mid

This redirect has been rated as Mid-importance on the project's importance scale.

This redirect is supported by Computer hardware task force (assessed as Mid-importance).

This redirect is supported by WikiProject Computer Security (assessed as High-importance).

Things you can help WikiProject Computer Security with:

Article alerts will be generated shortly by AAlertBot. Please allow some days for processing. More information...

Review importance and quality of existing articles
Identify categories related to Computer Security
Tag related articles
Identify articles for creation (see also: Article requests)
Identify articles for improvement
Create the Project Navigation Box including lists of adopted articles, requested articles, reviewed articles, etc.
Find editors who have shown interest in this subject and ask them to take a look here.

Internet Low‑importance

	Internet portal This redirect is within the scope of WikiProject Internet, a collaborative effort to improve the coverage of the Internet on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.InternetWikipedia:WikiProject InternetTemplate:WikiProject InternetInternet
Low	This redirect has been rated as Low-importance on the project's importance scale.

Reality Winner

In 2017, Reality Winner was identified as a suspect in a leak of National Security Agency documents, owing to a microdot pattern on the leaked papers.

That hasn't been confirmed and is based on widespread speculation. Although researchers found yellow-dot printer steganography in the NSA document, the FBI affidavit does not say they were used in the investigation. The affifavit notes that the document had been printed out, that Winner was one of six people who printed it, and they caught her because she also emailed The Intercept from her work computer. Affidavit is here:

https://www.justice.gov/opa/press-release/file/971331/download

I wrote about the topic in some depth on Quartz here:

https://qz.com/1002927/computer-printers-have-been-quietly-embedding-tracking-codes-in-documents-for-decades/

Microdots?

My impression from the EFF materials is that we are dealing with microdots. Did I get it wrong? (The DocuColor series prints a rectangular grid of 15 by 8 miniscule yellow dots on every color page. The same grid is printed repeatedly over the entire page, but the repetitions of the grid are offset slightly from one another so that each grid is separated from the others. The grid is printed parallel to the edges of the page, and the offset of the grid from the edges of the page seems to vary. These dots encode up to 14 7-bit bytes of tracking information, plus row and column parity for error correction. Typically, about four of these bytes were unused (depending on printer model), giving 10 bytes of useful data. Below, we explain how to extract serial number, date, and time from these dots. Following the explanation, we implement the decoding process in an interactive computer program).Joaquin Murietta 07:39, 2 November 2005 (UTC)[reply]

Not at all. A microdot is a miniaturized photograph downscaled to the size of a dot. This is a pattern of individual dots without finer internal structure. --Shaddack 02:45, 22 January 2007 (UTC)[reply]

Timestamps?

I understand how the printers can do serial numbers, since these are obviously embedded in the firmware or some other ROM/Flash IC. But how do they do timestamps? Do their timestamps depend on the administrator having correctly configured the time in the HTTP setup interface? Or do they try to access NTP servers via the network or something? Would be interesting to know how that works... Moxfyre 05:08, 7 February 2007 (UTC)[reply]

When the equipment is setup for the first time or rebuilt, the date and time is configured. Jeffz1 (talk) 00:32, 25 May 2009 (UTC)[reply]

Additional Manufacturer

Today I observed the pattern on a Ricoh Aficio MP C4500. LorenzoB (talk) 05:35, 21 October 2010 (UTC)[reply]
I have failed to observe any pattern or markings whatsoever on the HP Colour Lazer Jet Pro MFP M177fw 09:42, 28 March 2017 (UTC)

DocuColor and Epson Aculaser similarity

Most printers' codes have not been decoded, although the coding system framework and printer serial number encoding is the same on both DocuColor and the Epson Aculaser C1100/C1100N/A

This line seems a bit unclear, not to mention uncited. Is this original research? I can't find it anywhere on either of the EFF pages linked. Also, when it says "printer serial number encoding" it means that the ordering for the date, hour, minute and serial number is the same as well as number of bits in the serial number, correct? MecuryTACAMO --(talk) 12:32, 19 August 2016 (UTC)[reply]

Merge with Machine Identification Code

Looks like two articles on the same subject. --NetRolller 3D 18:30, 11 July 2017 (UTC)[reply]

Yes, supported. Tøpholm (talk) 13:43, 16 April 2018 (UTC)[reply]

External links modified

Hello fellow Wikipedians,

I have just modified 2 external links on Printer steganography. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

Corrected formatting/usage for http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=935180&isnumber=20242
Added archive https://www.webcitation.org/6837TR5vr?url=http://w2.eff.org/Privacy/printers/docucolor/ to http://w2.eff.org/Privacy/printers/docucolor/

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 22:11, 12 January 2018 (UTC)[reply]