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And make sure that the scan is of low enough resolution that it fails to pickup the printer identification dot pattern in the printout...

The fax should help with that, except that it'll reveal the location of your source fax. Using fax software/service needs its own security...

maybe snail-mail...

This is getting seriously nontrivial

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Well, if we talk about goverbment whistleblower programs I assume using a fax from a random location while travelling would be good enough to not be identified by your employer (or whom ever you blow whistle on).

If you do blow the whistel on the government, well, you better trust your journalist partner a lot. Or use a trustworthy lawyer as a go between.

But hey, one could send the fax back and forth, cut of the fax numbers and physically mail it from a very busy train station! And have a someone put the letter into the letterbox for you, someone you pay out of view of any CCTV cameras!

People who have information x, and were in location y (especially where y is not a common place for x holding people) will be a very limited set.

Don’t forget to pilfer newspapers from around the country and cut/glue letters from different fonts to compose the message and use homemade paper as the base layer.

Instead of home made, use the most prolific paper you can imagine!

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