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selfprivacy.org/content/en/docs/Services/delta-chat.md

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Delta Chat 2023-01-11T17:15:31+03:00 Delta Chat is an encrypted messaging app that uses email as transport.

Messengers like Telegram, Signal, Whatsapp can't be private due to the peculiarities of architecture - centralization. And peer-to-peer (p2p) services like tox consume too many resources and are inconvenient to use on a mobile device. The best solution is to use our own server.

  • Delta.Chat - uses your personal email server
  • Matrix - promising development, will be added to SelfPrivacy after stabilization.
  • XMPP/IRC - great candidates, will probably be added to SelfPrivacy later.
  • Rocket.Chat, Zulip, Mattermost - no convenient way to communicate between servers.

Typical data leaks when using alien servers

  1. IP once per minute. Helps determine your location: at home, away from home, at work.
  2. The content of your messages.
  3. Meta-information: with whom and when you communicated, even if you use encryption.

Features of Delta.Chat

  • Regular email client with all the features of IM.
  • Reliable end-to-end encryption (e2e), provided a personal [email server]({{< ref "email.md" >}}) is used by both interlocutors or a personal key exchange, such as via QR code.
  • Can use any email server, but then you lose control over the meta-information and risk key-swapping man-in-the-middle attack.
  • Slightly slower than usual messengers
  • First message is not encrypted because public encryption keys are sent with it.
  • There are problems with sending files > 5-7MB.
  • There are no convenient channels. We recommend using [decentralized social network]({{< ref "pleroma.md" >}})