Opened 3 months ago

Last modified 6 weeks ago

#31223 new defect

Research approaches for improving the availability of services under DoS

Reported by: asn Owned by:
Priority: Medium Milestone: Tor: 0.4.3.x-final
Component: Core Tor/Tor Version:
Severity: Normal Keywords: tor-hs tor-dos
Cc: Actual Points:
Parent ID: #29999 Points: 15
Reviewer: Sponsor: Sponsor27-must


We've been improving the health of the network during onion service DoS, but not the onion service availability. This is a task for looking at this angle.

During the related Stockholm session we looked into various approaches that could help us towards that goal. Here are some of them:

  • Introducing application-layer anonymous tokens that allow legit clients to get priority over DoS attacker
  • PoW approaches like argon2
  • CAPTCHA approaches like introducing a token server giving reCAPTCHA tokens
  • Hiding introduction points by rate limiting how quickly clients can find them. Valet nodes?
  • Having intros check that clients don't use the same IP over and over. Proof-of-existence?
  • Pay bitcoin to introduce

Each of the above solutions has problems and this is a ticket to investigate at least the most promising of them, and attempt to move forward with something.

Child Tickets

Change History (3)

comment:2 Changed 3 months ago by asn

Parent ID: #29999

comment:3 Changed 6 weeks ago by vinay

Things to consider:

Last edited 6 weeks ago by vinay (previous) (diff)
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