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<p>All known P2P networks are likely to be vulnerable to <a href="https://en.wikipedia.org/wiki/Sybil_attack">Sybil attack</a>, because each node is discoverable, and the network operates as a whole. Known measures to reduce the probability of the Sybil attack either require a centralized component or expensive <a href="https://en.wikipedia.org/wiki/Proof_of_work">proof of work</a>. The proposed design, on the opposite, has no server discoverability - servers are not connected, not known to each other and to all clients. The SimpleX network is fragmented and operates as multiple isolated connections. It makes network-wide attacks on SimpleX network impossible - even if some servers are compromised, other parts of the network can operate normally, and affected clients can switch to using other servers without losing contacts or messages.</p>
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<p>P2P networks are likely to be <a href="https://www.usenix.org/conference/woot15/workshop-program/presentation/p2p-file-sharing-hell-exploiting-bittorrent">vulnerable</a> to <a href="https://en.wikipedia.org/wiki/Denial-of-service_attack#Reflected_attack">DRDoS attack</a>. In the proposed design clients only relay traffic from known trusted connection and cannot be used to reflect and amplify the traffic in the whole network.</p>
<p>P2P networks are likely to be <a href="https://www.usenix.org/conference/woot15/workshop-program/presentation/p2p-file-sharing-hell-exploiting-bittorrent">vulnerable</a> to <a href="https://en.wikipedia.org/wiki/Denial-of-service_attack#Reflected_attack">DRDoS attack</a>. In the proposed design clients only relay traffic from known trusted connections and cannot be used to reflect and amplify the traffic in the whole network.</p>
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