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The real danger is someone figures out how to spoof a legitimate request to the TSA-QR service and have them create authentic codes with bogus data.

Never mind that the solution itself is far from 'easy'. Somehow linking every ticket printer to a central TSA-QR service in a reliable and secure way sounds like, uh, fun...

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Like how credit card processing works?

Yes, but only if:

1. All existing hardware and software magically vanishes

2. The government is put in charge of implementing its replacement.

3. The whole system is a dead-weight loss which exists to serve the whims of government oversight rather than facilitate commerce.

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