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< section id = "demo" class = "z-10" >
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< div class = "container" >
< h1 > SimpleX Chat< / h1 >
< h3 > Private & encrypted - the only platform without user identifiers!< / h3 >
< div class = "app__links" >
< a href = "https://apps.apple.com/us/app/simplex-chat/id1605771084" target = "_blank" > < img src = "./img/apple_store.svg" height = "42" > < / a >
< a href = "https://play.google.com/store/apps/details?id=chat.simplex.app" target = "_blank" title = "Public iOS preview on TestFlight" > < img src = "./img/google_play.svg" > < / a >
< a href = "https://app.simplex.chat" target = "_blank" title = "SimpleX F-Droid Repository" > < img src = "./img/f_droid.svg" height = "41" > < / a >
< a href = "https://testflight.apple.com/join/DWuT2LQu" target = "_blank" > < img src = "./img/testflight.png" width = "41" height = "41" > < / a >
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< a href = "https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex.apk" target = "_blank" > < img src = "./img/apk_icon.png" width = "41" height = "41" > < / a >
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< / div >
< p class = "d-none-576" > You can download terminal chat app from GitHub or using this command:< / p >
< p class = "content_copy_with_tooltip install d-none-576" >
< span class = "content" > curl -o- https://raw.githubusercontent.com/simplex-chat/simplex-chat/master/install.sh | bash< / span >
< span class = "tooltip" >
< span class = "tooltiptext" > Copy to clipboard< / span >
< img class = "content_copy" src = "./img/icons/content-copy.svg" >
< / span >
< / p >
< div class = "all-users" >
< div class = "user alice" >
< h3 > Alice< / h3 >
< div class = "terminal" >
< div class = "display" > < / div >
< div class = "input" > < / div >
< input type = "text" / >
< / div >
< / div >
< div class = "user bob d-none" >
< h3 > Bob< / h3 >
< div class = "terminal" >
< div class = "display" > < / div >
< div class = "input" > < / div >
< input type = "text" / >
< / div >
< / div >
< div class = "user simplex_mobile d-none-890" >
< img src = "./img/simplex_mobile.png" alt = "" width = "320" >
< / div >
< div class = "user tom d-none" >
< h3 > Tom< / h3 >
< div class = "terminal" >
< div class = "display" > < / div >
< div class = "input" > < / div >
< input type = "text" / >
< / div >
< / div >
< button class = "run-demo d-none-890" > Run demo< / button >
< button class = "run-faster d-none-890" > Faster!< / button >
< button class = "try-it d-none-890" > Try it!< / button >
< / div >
< / div >
< / section >
< section id = "introduction" >
< div class = "container" >
< h2 > Privacy redefined< / h2 >
< h3 > SimpleX advantage:< / h3 >
< p > SimpleX ensures data and meta-data privacy< / p >
< p > with a new protocol design – < / p >
< p > without using senders' and recipients' identifiers,< / p >
< p > unlike any other messaging platform.< / p >
< figure class = "section" >
< div class = "feature" >
< div class = "doodle control" > < / div >
< h4 > Security< / h4 >
< p > Two-layer encryption and communication integrity< / p >
< / div >
< div class = "feature" >
< div class = "doodle privacy" > < / div >
< h4 > Privacy< / h4 >
< p > Your contacts and messages are stored on your device< / p >
< / div >
< div class = "feature" >
< div class = "doodle convenience" > < / div >
< h4 > Convenience< / h4 >
< p > Easy to add contacts and start talking< / p >
< / div >
< / figure >
< / div >
< / section >
< section id = "problem" >
< div class = "container" >
< h2 > Problem: chat security< / h2 >
< a id = "problem-explained" > < / a >
< section class = "problem intro" >
< h3 > End-to-end encryption?< / h3 >
< p > Alice sends the key to Bob (e.g. via p2p network or via chat server)< / p >
< div class = "problem-section" >
< figure class = "communication" >
< figure class = "party alice" > Alice< / figure >
< img alt = "Alice sends the key to Bob" src = "./img/problem11.svg" / >
< figure class = "party bob" > Bob< / figure >
< / figure >
< / div >
< p > Now Bob can send encrypted messages to Alice - he believes it is secure!< / p >
< div class = "problem-section" >
< figure class = "communication" >
< figure class = "party alice" > Alice< / figure >
< img alt = "They believe it is secure" src = "./img/problem12.svg" / >
< figure class = "party bob" > Bob< / figure >
< / figure >
< / div >
< / section >
< section class = "problem explained" >
< h3 > Man-in-the-middle attack!< / h3 >
< p > But the key can be intercepted and substituted by Tom (the attacker)< / p >
< div class = "problem-section" >
< figure class = "communication" >
< figure class = "party alice" > Alice< / figure >
< img alt = "key is intercepted" src = "./img/problem21.svg" / >
< figure class = "party bob" > Bob< / figure >
< div class = "tom" > Tom< / div >
< / figure >
< / div >
< p > Now the attacker can read the messages without Alice or Bob knowing< / p >
< div class = "problem-section" >
< figure class = "communication" >
< figure class = "party alice" > Alice< / figure >
< img alt = "attacker can read messages" src = "./img/problem22.svg" / >
< figure class = "party bob" > Bob< / figure >
< div class = "tom" > Tom< / div >
< / figure >
< / div >
< / section >
< div class = "pagination" >
< a class = "page intro" href = "#problem-intro" > < / a >
< a class = "page explained" href = "#problem-explained" > < / a >
< / div >
< / div >
< / section >
< section id = "solution" >
< div class = "container" >
< h2 > What is the solution?< / h2 >
< p >
To create secure encrypted channel you need an existing secure channel
< br / > where you can pass the encryption key (or key fingerprint).
< / p >
< p > Any alternative solution can be compromised.< / p >
< / div >
< / section >
< section id = "connection" >
< div class = "container" >
< h2 > Make a private connection!< / h2 >
< h3 > To add contact and to start chat< / h3 >
< p >
Adding a contact in mobile app will require sharing your one-time QR code.
< br > In the < a href = "https://github.com/simplex-chat/simplex-chat" > terminal UI< / a > you need to share an invitation with your contact.
< / p >
< h4 > After creating your chat profile in the app:< / h4 >
< figure class = "section" >
< figure class = "conn-stage" >
< p > 1.< br > Show QR code or share link< / p >
< figure class = "device" >
< img alt = "mobile app: show QR code to add contact" src = "./img/1_show_qr_code.png" width = "187px" / >
< / figure >
< figure class = "party alice small" > Alice< / figure >
< / figure >
< img src = "img/arrow.svg" class = "arrow" / >
< figure class = "conn-stage" >
< p > 2.< br > Your contact scans QR code or opens link< / p >
< figure class = "device" >
< img alt = "mobile app: scan QR code" src = "./img/2_scan_qr_code.png" width = "187px" / >
< / figure >
< figure class = "party bob small" > Bob< / figure >
< / figure >
< img src = "img/arrow.svg" class = "arrow" / >
< figure class = "conn-stage" >
< p > 3.< br > A private connection is established< / p >
< figure class = "device" >
< img alt = "mobile app: confirm contact" src = "./img/3_connected.png" width = "187px" / >
< / figure >
< figure class = "party alice small" > Alice< / figure >
< / figure >
< img src = "img/arrow.svg" class = "arrow" / >
< figure class = "conn-stage" >
< p > 4.< br > Now you can chat privately!< / p >
< figure class = "device" >
< img alt = "mobile app: start chat" src = "./img/4_chat.png" width = "187px" / / >
< / figure >
< figure class = "party bob small" > Bob< / figure >
< / figure >
< / figure >
< / div >
< / section >
< section id = "comparison" >
< div class = "container" >
< h2 > Comparison with other protocols< / h2 >
< div class = "table-holder" >
< table class = "systems" >
< thead >
< tr >
< th > < / th >
< th class = "simplex" > < img alt = "simplex logo" src = "img/icon.svg" / > SimpleX chat< / th >
< th > Signal, big platforms< / th >
< th > XMPP, Matrix< / th >
< th > P2P protocols< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td > Requires global identity< / td >
< td class = "highlight good" > No - private< / td >
< td class = "highlight bad" > Yes < sup > 1< / sup > < / td >
< td class = "highlight bad" > Yes < sup > 2< / sup > < / td >
< td class = "highlight bad" > Yes < sup > 3< / sup > < / td >
< / tr >
< tr >
< td > Possibility of MITM< / td >
< td class = "highlight good" > No - secure< / td >
< td class = "highlight bad" > Yes < sup > 4< / sup > < / td >
< td class = "highlight bad" > Yes< / td >
< td class = "highlight bad" > Yes< / td >
< / tr >
< tr >
< td > Dependence on DNS< / td >
< td class = "highlight good" > No - resilient< / td >
< td class = "highlight bad" > Yes< / td >
< td class = "highlight bad" > Yes< / td >
< td class = "highlight good" > No< / td >
< / tr >
< tr >
< td > Single or centralized network< / td >
< td class = "highlight good" > No - decentralized< / td >
< td class = "highlight bad" > Yes< / td >
< td class = "highlight good" > No - federated < sup > 5< / sup > < / td >
< td class = "highlight bad" > Yes < sup > 6< / sup > < / td >
< / tr >
< tr >
< td > Central component or other network-wide attack< / td >
< td class = "highlight good" > No - resilient< / td >
< td class = "highlight bad" > Yes< / td >
< td class = "highlight bad" > Yes < sup > 2< / sup > < / td >
< td class = "highlight bad" > Yes < sup > 7< / sup > < / td >
< / tr >
< / tbody >
< / table >
< / div >
< div class = "table-comments" >
< ul class = "legend" >
< li class = "good" > Good< / li >
< li class = "bad" > Bad< / li >
< / ul >
< div class = "footnotes" >
< ol >
< li > Usually based on a phone number, in some cases on usernames< / li >
< li > DNS-based addresses< / li >
< li > Public key or some other globally unique ID< / li >
< li > If operator’ < / li >
< li > Does not protect users' metadata< / li >
< li >
While P2P are distributed, they are not federated - they operate as a single network
< / li >
< li >
P2P networks either have a central authority or the whole network can be compromised -
see
< a
href="https://github.com/simplex-chat/protocol#comparison-with-p2p-messaging-protocols"
>here< /a
>
< / li >
< / ol >
< / div >
< / div >
< / div >
< / section >
< section id = "messaging" >
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< div class = "container flex flex-col items-center" >
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< div >
< h2 > SimpleX messaging protocol< / h2 >
< h3 > Unidirectional (simplex) queues< / h3 >
< p >
< a
href="https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md"
target="_blank"
>Simplex messaging protocol< /a
>
(SMP) for messaging via secure persistent queues will serve as the low level protocol for
SimpleX chat - see
< a href = "https://github.com/simplex-chat/simplex-messaging" target = "_blank"
>demo server implementation< /a
>.< br / >
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.< br / >
< / p >
< / div >
< img alt = "simplex messaging protocol" src = "./img/messaging.png" >
< / div >
< / section >
< section id = "chat" >
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< div class = "container flex flex-col items-center" >
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< div >
< h2 > Chat< / h2 >
< h3 > Communication integrity< / h3 >
< p >
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.
< / p >
< / div >
< img alt = "simplex chat: duplex conversation" src = "./img/chat.png" >
< / div >
< / section >
< section id = "simplex" >
< div class = "container" >
< article id = "use-simplex" class = "half" >
< h3 > Use SimpleX< / h3 >
< p >
SimpleX chat terminal client
< a href = "https://github.com/simplex-chat/simplex-chat/releases/tag/v2.0.0" target = "_blank" > v2.0.0< / a > is
released!< br / >
– < br / >
– < br / >
– < br / >
< / p >
< p >
You can use our servers or deploy your own, e.g. using
< a href = "https://github.com/simplex-chat/simplexmq#deploy-smp-server-on-linode" target = "_blank" >
StackScript on Linode< / a > .
< / p >
< p >
Sign up to be updated about the new releases.
< / p >
< form class = "sign-up"
action="https://chat.us2.list-manage.com/subscribe/post?u=ddd892b258ae36e5438e6d4e1& id=ad6037a2fe"
method="post" target="_blank" novalidate>
< div >
< input name = "EMAIL" placeholder = "Your email" / >
< span style = "position: absolute; left: -5000px" aria-hidden = "true" >
< input type = "text" name = "b_ddd892b258ae36e5438e6d4e1_ad6037a2fe" tabindex = "-1" value = "" / >
< / span >
< button type = "submit" > Submit< / button >
< / div >
< / form >
< / article >
< article id = "join-simplex" class = "half" >
< h3 > Join SimpleX< / h3 >
< p >
The project can move faster with your help.< br / >
We develop it in Haskell.
< / p >
< div id = "contacts" >
< p >
< a href = "mailto:chat@simplex.chat" >
< span class = "button" > Email< / span > chat@simplex.chat< / a >
< / p >
< p >
< a href = "https://github.com/simplex-chat/simplex-chat" target = "_blank" > < span
class="button">Join< / span > github.com/simplex-chat< / a >
< / p >
< p >
< a href = "https://opencollective.com/simplex-chat" target = "_blank" > < span class = "button" > Donate< / span >
opencollective.com/simplex-chat< / a > < strong > (now accepts crypto)< / strong >
< / p >
< / div >
< / article >
< / div >
< / section >
< footer >
< div class = "container" >
< img alt = "simplex logo" class = "logo d-none-992" src = "./img/simplex.svg" / >
< div class = "copyright__text_and_links" >
< p class = "copyright" > © 2020-22 SimpleX | Open-Source Project < span class = "d-none-576" > |< / span > < / p >
< div >
< a class = "" href = "https://github.com/simplex-chat" target = "_blank" > < img
src="./img/icons/github.svg">< / a >
< a class = "" href = "https://www.reddit.com/r/SimpleXChat/" target = "_blank" > < img
src="./img/icons/reddit.svg">< / a >
< a class = "" href = "https://twitter.com/simplexchat" target = "_blank" > < img
src="./img/icons/twitter.svg">< / a >
< a class = "" href = "https://www.linkedin.com/company/simplex-chat/" target = "_blank" > < img
src="./img/icons/linkedin.svg">< / a >
< a class = "" href = "mailto:chat@simplex.chat" target = "_blank" > < img src = "./img/icons/email.svg" > < / a >
< / div >
< / div >
< div class = "github d-none-992" >
< a class = "github-button" href = "https://github.com/simplex-chat/protocol" data-size = "large"
data-show-count="true" aria-label="Star simplex-chat on GitHub">Star< / a >
< / div >
< / div >
< / footer >
< / body >
< / html >
