25 lines
919 B
Markdown
25 lines
919 B
Markdown
# tor-hspow
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Tor supports optional proof-of-work client puzzles, for mitigating denial of
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service attacks on onion services. This crate implements the specific puzzle
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algorithms we use, and infrastructure for solving puzzles asynchronously.
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[Proposal 327] introduced our first algorithm variant, named `v1`.
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It is based on the Equi-X asymmetric puzzle and an adjustable effort check
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using a Blake2b hash of the proof. The underlying algorithm is provided by
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the [`equix`] crate.
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[Proposal 327]: https://gitlab.torproject.org/tpo/core/torspec/-/blob/main/proposals/327-pow-over-intro.txt
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## EXPERIMENTAL DRAFT
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Just here as a proof-of-concept and to test the algorithms.
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None of the API here is final, the current status is that lower layers are
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exposed unnecessarily and upper layers are unwritten.
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For Tor client puzzle support in Arti. ([#889])
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[#889]: https://gitlab.torproject.org/tpo/core/arti/-/issues/889
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