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Re:What's Inside the EU Green Pass QR Code? by pftburger on Tuesday June 22, 2021 @10:32AM (#27592117)
The system is actually comprised of two apps, CovPass and CovCheck.

Both are in the repo.

The check app validates the pass in-app, and, as far as I can tell, doesn’t phone home or report any data. IE there is no logging of the scanned persons data

Re:What's Inside the EU Green Pass QR Code? by DeusExMachina on Tuesday June 22, 2021 @10:36AM (#27592185)
And what prevents the checker from taking screenshots or recording the screen to harvest the data later?
Re:What's Inside the EU Green Pass QR Code? by 34679 on Tuesday June 22, 2021 @10:49AM (#27592358)
The same thing that prevents them from stabbing you and taking your money. It's illegal and wrong.
Re:What's Inside the EU Green Pass QR Code? by mmcnl on Tuesday June 22, 2021 @01:18PM (#27594390)
It's illegal due to GDPR.
Re:What's Inside the EU Green Pass QR Code? by torgard on Tuesday June 22, 2021 @10:50AM (#27592384)
For one thing, GDPR. It's illegal.

Apps can also be configured to prohibit (or at least make it harder make) screenshots/screen-recordings. It can of course be circumvented, but still. It's illegal.

I would consider it as safe as showing my ID to a bartender/bouncer. Safer, even, as they don't get as much data.