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<p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p>
<h2 id="peer-to-peer" tabindex="-1">Peer-to-peer</h2>
<p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p>
<p>The advantage is that the participants do not depend on any servers. There are <a href="SIMPLEX.html#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p>
<p>The advantage is that the participants do not depend on any servers. There are <a href="simplex.html#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p>
<p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p>
<h2 id="perfect-forward-secrecy" tabindex="-1">Perfect forward secrecy</h2>
<p><a href="#forward-secrecy">Forward secrecy</a>.</p>