Do not blur, but do randomly add noise or move pixels – Censoring image in GIMP – Graphic Design Stack Exchange
Posted by jpluimers on 2019/05/03
Blurring is like a hash function: it cannot be undone, but with enough plain text to blur examples, you can reconstruct the plain text: [WayBack] Why blurring sensitive information is a bad idea | dheera.net | Dheera Venkatraman’s web site
As an alternative, randomly add noise or move pixels. I used [WayBack] Censoring image in GIMP – Graphic Design Stack Exchange. For the example on the right, I used “Filters → Noise → Spread” from the Stack Exchange answer.
With enough randomness, it is much harder to construct plain/hash combinations.
–jeroen
The Wiert Corner - irregular stream of stuff 
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