Come say hi on #matrix:matrix.org! Install synapse and tell us how you get on. Critique the spec. Write
Come say hi on [\#matrix:matrix.org](https://matrix.to/#/#matrix:matrix.org)! Install synapse and tell us how you get on. Critique the spec. Write
clients. Write bridges! Run bridges! Nose around in [Jira](https://matrix.org/jira) and
send us some pull requests on github to fix some bugs or add some features! You could even
try to write a homeserver (but be warned, Matrix's architecture makes homeservers orders of
@ -414,7 +414,7 @@ full details on how to contribute to the project. All are welcome!
##### Where can I get support?
\#matrix:matrix.org aka \#matrix on irc.freenode.is your best bet.
[\#matrix:matrix.org](https://matrix.to/#/#matrix:matrix.org) aka \#matrix on irc.freenode.is your best bet.
##### How do I register custom matrix event types?
@ -449,6 +449,14 @@ Sure. An ever increasing number of protocols are being bridged into Matrix, so i
A user's clients connect to a single homeserver, which stores the communication history and account information for that user, and shares data with the wider Matrix ecosystem by synchronising communication history with other homeservers.
##### What is a MXID?
Matrix user IDs (MXID) are unique user IDs. They are in the format ```@username:homeserver.tld``` (this format is used to avoid confusing them with email addresses). They are intended to be fairly hidden (although right now they are not) - instead you will find and identify other users via 3PIDs.
##### What is a 3PID?
Third-party IDs (3PIDs) are IDs from other systems or contexts, such as email addresses, social network accounts and phone numbers.
##### What is an identity server?
Users in Matrix are identified internally via their matrix user ID (MXID). However, existing 3rd party ID (3PID) namespaces such as email addresses or phone numbers should be used publically to identify Matrix users, at least for invitation purposes. A Matrix "Identity" describes both the user ID and any other existing IDs from third party namespaces linked to their account.
@ -470,10 +478,6 @@ The precise architecture of identity servers is currently in flux and subject to
Each homeserver stores the communication history and account information for all of its clients, and shares data with the wider Matrix ecosystem by synchronising communication history with other homeservers and their clients. Clients typically communicate with each other by emitting events in the context of a virtual room. Room data is replicated across all of the homeservers *whose users are participating in a given room*.
##### What is a 3PID?
Third-party IDs (3PIDs) are IDs from other systems or contexts, such as email addresses, social network accounts and phone numbers.
##### How do you do VoIP calls on Matrix?
Voice (and video) over Matrix uses the WebRTC 1.0 standard to transfer call media (i.e. the actual voice and video traffic). Matrix is used to signal the establishment and termination of the call by sending call events, like any other event. Currently calls are only supported in rooms with exactly two participants - however, one of those participants may be a conferencing bridge. We're looking at better ways to do group calling.
@ -488,13 +492,13 @@ The Apache Licence is a permissive licence. We want the Matrix protocol itself t
##### Can I write a Matrix homeserver?
Yes. Matrix is just a spec, so implementations of the spec are very welcome! It should be noted that as of October 2015, changes are still being made to the spec, so if you want to write a Matrix homeserver, it is strongly recommended that you chat to the Matrix.org devs in #matrix:matrix.org first! You can also read about the [Federation API here](https://matrix.org/docs/spec/server_server/unstable.html).
Yes. Matrix is just a spec, so implementations of the spec are very welcome! It should be noted that as of October 2015, changes are still being made to the spec, so if you want to write a Matrix homeserver, it is strongly recommended that you chat to the Matrix.org devs in [\#matrix:matrix.org](https://matrix.to/#/#matrix:matrix.org) first! You can also read about the [Federation API here](https://matrix.org/docs/spec/server_server/unstable.html).
##### How secure is this?
Server-server traffic is mandatorily TLS from the outset. Server-client traffic mandates transport layer encryption other than for tinkering. Servers maintain a public/private key pair, and sign the integrity of all messages in the context of the historical conversation, preventing tampering. Server keys are distributed using a [Perspectives](https://perspectives-project.org/)-style system.
End-to-end encryption is coming shortly to clients for both 1:1 and group chats to protect user data stored on servers, using the [Olm](https://matrix.org/git/olm) cryptographic ratchet implementation. As of October 2015 this is blocked on implementing the necessary key distribution and fingerprint management.
End-to-end encryption is now available in the various [Riot.im](https://Riot.im) builds! This allows you to encrypt both 1:1 and group chats to protect user data stored on servers, using the [Olm](https://matrix.org/git/olm) cryptographic ratchet implementation. Read more on the [blog post](https://matrix.org/blog/2016/11/21/matrixs-olm-end-to-end-encryption-security-assessment-released-and-implemented-cross-platform-on-riot-at-last/) that announced the feature!
Privacy of metadata is not currently protected from server administrators - a malicious homeserver administrator can see who is talking to who and when, but not what is being said (once E2E encryption is enabled). See [this presentation from Jardin Entropique](http://matrix.org/~matthew/2015-06-26%20Matrix%20Jardin%20Entropique.pdf) for a more comprehensive discussion of privacy in Matrix.
@ -592,7 +596,9 @@ You can also run Vector, the code that Riot.im uses, on your own server. It's a
##### Where can I find a desktop client?
There are several, but they don't have all the features that synapse has. Check the list of clients on [matrix.org](http://matrix.org/docs/projects/try-matrix-now.html#clients).
You can use the desktop build of [Riot.im](https://riot.im/desktop.html).
There are also other desktop clients - check the list of clients on [matrix.org](http://matrix.org/docs/projects/try-matrix-now.html#clients).
##### Why can't end-to-end encryption be turned off?
Oddvar Lovaas
8 years ago