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<p>Thank you,</p>
<p>Evgeny</p>
<p>SimpleX Chat founder</p>
<p>[1] You can also to self-host your own SimpleX servers on <a href="https://home.runonflux.io/apps/marketplace?q=simplex">Flux decentralized cloud</a>.</p>
<p>[2] The probability of connection being de-anonymized and the number of random server choices follow this equation: <code>(1 - s ^ 2) ^ n = 1 - p</code>, where <code>s</code> is the share of attacker-controlled servers in the network, <code>n</code> is the number of random choices of entry and exit nodes for the circuit, and <code>p</code> is the probability of both entry and exit nodes, and the connection privacy being compromised. Substituting <code>0.02</code> (2%) for <code>s</code>, <code>0.5</code> (50%) for <code>p</code>, and solving this equation for <code>n</code> we obtain that <code>1733</code> random circuits have 50% probability of privacy being compromised.</p>
<p>Also see <a href="https://ritter.vg/p/tor-v1.6.pdf">this presentation about Tor</a>, specifically the approximate calculations on page 76, and also <a href="https://blog.torproject.org/announcing-vanguards-add-onion-services/">Tor project post</a> about the changes that made attack on hidden service anonymity harder, but still viable in case the it is used for a long time.</p>
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