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> we're still trying to invent a better abuse-resistance system than a captcha.

> Invent a better one and the world will throw money at you.

It already exists.

The abuse stems from the fact servers connected to the wider internet are designed to respond to anyone who tries to talk to it. That's the fundamental problem with internet security today: computers talk to strangers they don't know much less trust.

What if computers dropped all packets by default and networked only with authorized users? The risk of exploitation and abuse becomes negligible because to unauthorized users it's like the computer is not even there to begin with.

This can be done with single packet authorization. The internet would lose its mass market appeal but it's much better than normalized widespread surveillance.

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