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It is said{{By whom|date=April 2018}} to detect reordering, deletion, and replay of sent messages, and improve forward secrecy properties against passive eavesdropping in comparison to OTR messaging.
Combined with [[public key infrastructure]] for the retention of pregenerated one-time keys (prekeys), it allows for the initialization of messaging sessions without the presence of the remote peer ([[asynchronous communication]]). The usage of [[Diffie–Hellman key exchange#Triple Diffie-Hellman (3-DH)|triple Diffie–Hellman key exchange (3-DH)]] as initial key exchange method improves the deniability properties. An example of this is the Signal Protocol, which combines the Double Ratchet Algorithm, prekeys, and a 3-DH handshake.<ref name="Unger-2015-p241">{{harvnb|Unger|Dechand|Bonneau|Fahl|2015|p=241}}</ref> The protocol provides confidentiality, integrity, authentication, participant consistency, destination validation, forward secrecy, backward secrecy (aka future secrecy), causality preservation, message unlinkability, message repudiation, participation repudiation, and asynchronicity.<ref name="Unger-2015-p239"/> It does not provide anonymity preservation, and requires servers for the relaying of messages and storing of public key material.<ref name="Unger-2015-p239">{{harvnb|Unger|Dechand|Bonneau|Fahl|2015|p=239}}</ref>
== Functioning ==
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