Today, we are officially introducing a proof-of-work (PoW) defense for onion services designed to prioritize verified network traffic as a deterrent against denial of service (DoS) attacks with the release of Tor 0.4.8.
A new DoS protection mechanism for Tor leveraging Proof-of-Work.
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This is a pretty excellent use case for PoW. I could see this being adopted by other DDoS services, server stacks, and eventually make its way into openwrt, pfsense etc.
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I mean technically that’s also the case with the Tor protocol.