Changes for page Matrix

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4	4	== What is Matrix? ==
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6	6
	7	+[[image:https://element.io/images/Ui-grad-homepage.png||height="677" width="942"]]
	8	+
	9	+
7	7	[[Matrix>>https://matrix.org/]] is a chat system very similar to E-Mail, but instantaneous and secure.
8	8
9	9	* You need to register an account at a provider (e.g. tum.de, or lmu.de)
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16	16	Several apps exist, but we're going to go with "[[Element>>https://element.io/]]" for the sake of simplicity, as it's among the most fully-featured Matrix apps on the market.
17	17	)))
18	18
19		-So People have their **account on one server** but can write messages **to anyone on other servers**.
	22	+So people have their **account on one server** but can write messages **to anyone on other servers**.
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21	21
22		-You can create[[ end-to-end encrypted>>https://en.wikipedia.org/wiki/End-to-end_encryption]] **personal or group chats** that are not stored and **not dependent on a central authority** like most other tools (MS Teams, WhatsApp, Zoom, ...).
	25	+**Personal or group chats** are[[ end-to-end encrypted>>https://en.wikipedia.org/wiki/End-to-end_encryption]] and **not dependent on a central authority** like most other tools (MS Teams, WhatsApp, Zoom, ...) - anyone can host a Matrix server.
23	23	All your messages are **synced** between all your devices - web clients, desktop clients, smartphone apps.
24	24	For additional security, encryption keys of contacts can be verified and then stored as trusted.
25	25
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27	27
28	28	Messages are stored and synced between home servers.
29	29
30		-A user typically has **one account** on one homeserver. You can use any homeserver of your choice - however [[ITO>>doc:CIT.ITO.WebHome]] offers two homeservers:
	33	+A user typically has **one account** on one homeserver.
	34	+You can use any homeserver of your choice - however **for TUM**, [[ITO>>doc:CIT.ITO.WebHome]] offers two homeservers:
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32	32	* **matrix.cit.tum.de** for CIT accounts: @username:cit.tum.de
33	33	* **matrix.tum.de** for TUM accounts: @username:tum.de
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34	34
35	35	You only need to use one account and can communicate with any other homeserver of the world.
36	36
37		-If you don't have a CIT or TUM account, you can use a public homeserver instead:
	41	+If you don't have a CIT or TUM account, you can use a **public** homeserver instead:
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39	39	* matrix.org: [[https:~~/~~/app.element.io/#/register>>https://app.element.io/#/register]]
40	40	* or any other homeserver [[https:~~/~~/joinmatrix.org/servers/>>https://joinmatrix.org/servers/]]
41		-* or, host your own homeserver :)
	45	+* or, [[host your own homeserver>>https://matrix-org.github.io/synapse/latest/]] 🤩
42	42
43	43	To use your home server, you have to **use a client** that communicates with your homeserver.
44	44
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47	47	[[Element>>https://element.io/]] is our client of choice.
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49	49	* [[Desktop Client>>https://element.io/download]] (easily provided in [[your Linux distribution of choice>>https://repology.org/project/element-desktop]])
50		-* as web client:
	54	+* In your web browser:
51	51	** [[matrix.cit.tum.de>>https://matrix.cit.tum.de]]
52	52	** [[matrix.tum.de>>https://matrix.tum.de]]
53		-* [[on your smartphone>>https://element.io/download]]
	57	+* [[On your smartphone>>https://element.io/download]]
54	54
55	55	(% class="wikigeneratedid" %)
56	56	Make sure the **home server is set correctly** to your provider!
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66	66	)))
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68	68
69		-== Basic Usage of Element ==
	73	+== Using Element for Matrix ==
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72	72	Follow [[the official guide>>https://matrix.org/docs/chat_basics/]] how to chat with Element 😎
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	78	+You can create **personal chats**, **group chats**, and **spaces** for bundling multiple chatrooms to communicate with any other Matrix user in the world.
74	74
75		-=== Invitation of TUM Users ===
76	76
	81	+== Invitation of TUM Users ==
	82	+
77	77	When inviting TUM or CIT users to a chat, just enter the following Matrix IDs:
78	78
79	79	**For CIT Accounts**:
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99	99
100	100	The invitation will then appear in the Matrix client of the just-added user and must be accepted.
101	101
102		-
	108	+
	109	+== Secure Backup ==
	110	+
	111	+Since end-to-end encryption stores decryption keys only on clients (the "end"), logging out of the last client would mean loosing all messages.
	112	+
	113	+Matrix allows to create a encrypted backup of the decryption keys on your homeserver - with a separate passphrase.
	114	+
	115	+Matrix will ask you to set up your secure backup, and will request the password for the backup keys if needed.
	116	+
	117	+More information is in the [[official documentation about private chats>>https://matrix.org/docs/chat_basics/private-group-chat/]] 🤓