+ 
+ 
+ 
+ 
+ You can download terminal chat app from GitHub or using this command:
+
+ curl -o- https://raw.githubusercontent.com/simplex-chat/simplex-chat/master/install.sh | bash
+
+ Copy to clipboard
+ 
+
+
+ SimpleX ensures data and meta-data privacy
+with a new protocol design – it delivers messages
+without using senders' and recipients' identifiers,
+unlike any other messaging platform.
+Two-layer encryption and communication integrity
+Your contacts and messages are stored on your device
+Easy to add contacts and start talking
+Alice sends the key to Bob (e.g. via p2p network or via chat server)
+
+ Now Bob can send encrypted messages to Alice - he believes it is secure!
+
+ But the key can be intercepted and substituted by Tom (the attacker)
+
+ Now the attacker can read the messages without Alice or Bob knowing
+
+
+ To create secure encrypted channel you need an existing secure channel
+
where you can pass the encryption key (or key fingerprint).
+
Any alternative solution can be compromised.
+
+ Adding a contact in mobile app will require sharing your one-time QR code.
+
In the terminal UI you need to share an invitation with your contact.
+
1.
Show QR code or share link
+ 
+ 2.
Your contact scans QR code or opens link
+
+ 3.
A private connection is established
+
+ 4.
Now you can chat privately!
+ | + |  SimpleX chat |
+ Signal, big platforms | +XMPP, Matrix | +P2P protocols | +
|---|---|---|---|---|
| Requires global identity | +No - private | +Yes 1 | +Yes 2 | +Yes 3 | +
| Possibility of MITM | +No - secure | +Yes 4 | +Yes | +Yes | +
| Dependence on DNS | +No - resilient | +Yes | +Yes | +No | +
| Single or centralized network | +No - decentralized | +Yes | +No - federated 5 | +Yes 6 | +
| Central component or other network-wide attack | +No - resilient | +Yes | +Yes 2 | +Yes 7 | +
+ Simplex messaging protocol
+ (SMP) for messaging via secure persistent queues will serve as the low level protocol for
+ SimpleX chat - see
+ demo server implementation.
+ It uses different encryption keys for each message queue - the key is passed via existing
+ secure channel - e.g. QR code or another simplex queue.
+
+ + Each chat uses two (or more) simplex queues for duplex communication. Each message contains the + hash of the previous message to detect if messages are lost or changed. +
+
+
+ SimpleX chat terminal client
+ v2.0.0 is
+ released!
+ – groups and files
+ – two-layer E2E encryption, with double-ratchet algorithm
+ – protocol is compatible with mobile apps
+
+ You can use our servers or deploy your own, e.g. using + + StackScript on Linode. +
++ Sign up to be updated about the new releases. +
+ +
+ The project can move faster with your help.
+ We develop it in Haskell.
+
+ + opencollective.com/simplex-chat (now accepts crypto) +
+
+ 
+ 
+ 
+ 
+ If you already installed SimpleX Chat for the + terminal v1.0.0+, copy the command below and use it in the chat: +
+ +
+
+
+ Copy to clipboard
+ 
+
+
+ Scan QR code from mobile app
++ To make a connection: +
++ use this command: +
+curl -o- https://raw.githubusercontent.com/simplex-chat/simplex-chat/master/install.sh
+ |
+ bash
+
+ Copy to clipboard
+
+
+
+ See SimpleX Chat
+ GitHub repository
+ 
+ for the instructions how to download or compile it from the source code.
+
+ SimpleX chat terminal client
+ v2.0.0 is
+ released!
+ – groups and files
+ – two-layer E2E encryption, with double-ratchet algorithm
+ – protocol is compatible with mobile apps
+
+ You can use our servers or deploy your own, e.g. using + + StackScript on Linode. +
++ Sign up to be updated about the new releases. +
+ +
+ The project can move faster with your help.
+ We develop it in Haskell.
+
+ + opencollective.com/simplex-chat (now accepts crypto) +
+
+- Good
+ - Bad
+
+ ++- Usually based on a phone number, in some cases on usernames
+ - DNS-based addresses
+ - Public key or some other globally unique ID
+ - If operator’s servers are compromised
+ - Does not protect users' metadata
+ -
+ While P2P are distributed, they are not federated - they operate as a single network
+
+ -
+ P2P networks either have a central authority or the whole network can be compromised -
+ see
+ here
+
+
+