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<!DOCTYPE html> <!DOCTYPE html>
<html lang="en"> <html><head><meta charset="UTF-8" /><link rel="stylesheet" href="../help.css" /></head><body><ul id="top">
<li><a href="#what-is-delta-chat">What is Delta Chat?</a>
<head>
<title>FAQ - Delta Chat</title>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0" />
<meta name="description" content="Delta Chat - Email Based Instant Messenger" />
<meta name="keywords" content="delta chat, email messaging app, download delta chat" />
<link rel="stylesheet" href="../assets/css/styles.css" type="text/css" />
<link rel="alternate" href="https://delta.chat/feed.xml" type="application/atom+xml" title="" />
</head>
<body id="top">
<div id="menu">
<ul>
<li><a href="../en/">Home</a></li>
<li><a href="download">Download</a></li>
<li><a href="blog">Blog</a></li>
<li><a href="contribute">Contribute</a></li>
<li><a href="help">FAQ</a></li>
<li><a href="https://support.delta.chat">Forum</a></li>
</ul>
</div>
<div id="content">
<h1>Frequently Asked Questions</h1>
<details>
<summary>
Table of Contents
</summary>
<ul> <ul>
<li><a href="#general">General</a>
<ul>
<li><a href="#what-is-delta-chat">What is Delta Chat?</a></li>
<li><a href="#how-can-i-find-people-to-chat-with">How can I find people to chat with?</a></li> <li><a href="#how-can-i-find-people-to-chat-with">How can I find people to chat with?</a></li>
<li><a href="#what-are-the-advantages-of-delta-chat-compared-to-other-messengers">What are the advantages of Delta Chat compared to other messengers?</a></li> <li><a href="#what-are-the-advantages-of-delta-chat-compared-to-other-messengers">What are the advantages of Delta Chat compared to other messengers?</a></li>
<li><a href="#which-messages-do-appear-in-delta-chat">Which messages do appear in Delta Chat?</a></li> <li><a href="#which-messages-do-appear-in-delta-chat">Which messages do appear in Delta Chat?</a></li>
@ -96,29 +51,20 @@
</li> </li>
</ul> </ul>
</details>
<h2 id="general"> <h2 id="what-is-delta-chat">
General <a href="#general" class="anchor"></a>
</h2>
<h3 id="what-is-delta-chat">
What is Delta Chat? <a href="#what-is-delta-chat" class="anchor"></a> What is Delta Chat? <a href="#what-is-delta-chat" class="anchor"></a>
</h3> </h2>
<p><img style="float: right;" width="400px" src="../assets/home/delta-what.png" /></p>
<p>Delta Chat is a new chat app that sends messages via e-mails, encrypted if possible, with Autocrypt. <p>Delta Chat is a new chat app that sends messages via e-mails, encrypted if possible, with Autocrypt.
<strong>You do not have to sign up anywhere, just use your existing e-mail account with Delta Chat.</strong></p> <strong>You do not have to sign up anywhere, just use your existing e-mail account with Delta Chat.</strong></p>
<p><a href="#top">↑ Top</a></p>
<h3 id="how-can-i-find-people-to-chat-with"> <h3 id="how-can-i-find-people-to-chat-with">
@ -131,6 +77,8 @@
<p>With Delta Chat, you can write to every existing e-mail address - even <p>With Delta Chat, you can write to every existing e-mail address - even
if the recipient is not using the Delta Chat app. No need for the if the recipient is not using the Delta Chat app. No need for the
recipient to install the same app as yours, as with other messengers.</p> recipient to install the same app as yours, as with other messengers.</p>
<p><a href="#top">↑ Top</a></p>
<h3 id="what-are-the-advantages-of-delta-chat-compared-to-other-messengers"> <h3 id="what-are-the-advantages-of-delta-chat-compared-to-other-messengers">
@ -155,6 +103,8 @@ the same e-mail servers</li>
<li><em>Trustworthy</em> - can even be used for business messages.</li> <li><em>Trustworthy</em> - can even be used for business messages.</li>
<li><em>Copyleft</em> and <em>Standards</em> based libre software.</li> <li><em>Copyleft</em> and <em>Standards</em> based libre software.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="which-messages-do-appear-in-delta-chat"> <h3 id="which-messages-do-appear-in-delta-chat">
@ -173,6 +123,8 @@ the same e-mail servers</li>
</ul> </ul>
<p>Other messages do not appear automatically, and are to be found in the main menu at <strong>Contact requests</strong>. If desired a chat can be started from there.</p> <p>Other messages do not appear automatically, and are to be found in the main menu at <strong>Contact requests</strong>. If desired a chat can be started from there.</p>
<p><a href="#top">↑ Top</a></p>
<h3 id="what-about-spam"> <h3 id="what-about-spam">
@ -187,6 +139,8 @@ the same e-mail servers</li>
<li>As messages from unknown contacts do not pop up automatically, normally, there is <strong>no spam</strong>.</li> <li>As messages from unknown contacts do not pop up automatically, normally, there is <strong>no spam</strong>.</li>
<li>However, if needed, you can <strong>block</strong> any contact.</li> <li>However, if needed, you can <strong>block</strong> any contact.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="does-delta-chat-support-images-videos-and-other-attachments"> <h3 id="does-delta-chat-support-images-videos-and-other-attachments">
@ -199,6 +153,8 @@ the same e-mail servers</li>
<ul> <ul>
<li>Yes. Beside the plain text, all e-mail attachments are displayed as separate messages. Outgoing messages get attachments as needed automatically.</li> <li>Yes. Beside the plain text, all e-mail attachments are displayed as separate messages. Outgoing messages get attachments as needed automatically.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="who-sees-my-profile-picture"> <h3 id="who-sees-my-profile-picture">
@ -226,6 +182,8 @@ your contacts will re-receive your profile picture, even if they add a new
device.</p> device.</p>
</li> </li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="does-delta-chat-support-html-e-mails"> <h3 id="does-delta-chat-support-html-e-mails">
@ -238,6 +196,8 @@ device.</p>
<ul> <ul>
<li>Yes. If incoming e-mail lacks a plain text part, HTML-emails is converted to plain text in the app. Outgoing e-mails always use plain text.</li> <li>Yes. If incoming e-mail lacks a plain text part, HTML-emails is converted to plain text in the app. Outgoing e-mails always use plain text.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="why-do-i-have-to-enter-my-e-mail-password-into-delta-chat-is-this-secure"> <h3 id="why-do-i-have-to-enter-my-e-mail-password-into-delta-chat-is-this-secure">
@ -260,6 +220,8 @@ access token is used.</p>
Code</a> Code</a>
if you want to verify that your credentials are handled securely. We are happy if you want to verify that your credentials are handled securely. We are happy
about feedback which makes the app more secure for all of our users.</p> about feedback which makes the app more secure for all of our users.</p>
<p><a href="#top">↑ Top</a></p>
<h3 id="which-android-permissions-does-delta-chat-need"> <h3 id="which-android-permissions-does-delta-chat-need">
@ -310,6 +272,8 @@ about feedback which makes the app more secure for all of our users.</p>
</ul> </ul>
</li> </li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h2 id="groups"> <h2 id="groups">
@ -332,6 +296,8 @@ about feedback which makes the app more secure for all of our users.</p>
<li>On the following screen, select the <strong>group members</strong> and hit the check mark in the upper right corner. After that, you can define a <strong>group name</strong>.</li> <li>On the following screen, select the <strong>group members</strong> and hit the check mark in the upper right corner. After that, you can define a <strong>group name</strong>.</li>
<li>As soon as you write the <strong>first message</strong> in the group, all members are informed about the new group and can answer in the group (as long as you do not write a message in the group the group is invisible to the members).</li> <li>As soon as you write the <strong>first message</strong> in the group, all members are informed about the new group and can answer in the group (as long as you do not write a message in the group the group is invisible to the members).</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="add-members-to-a-group"> <h3 id="add-members-to-a-group">
@ -345,6 +311,8 @@ about feedback which makes the app more secure for all of our users.</p>
<li>Every group member has the <strong>same rights</strong> as any other. For this reason every one can delete every member or add new ones.</li> <li>Every group member has the <strong>same rights</strong> as any other. For this reason every one can delete every member or add new ones.</li>
<li>To add or delete members, click on the group name in the chat.</li> <li>To add or delete members, click on the group name in the chat.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="what-is-a-verified-group-why-is-it-experimental"> <h3 id="what-is-a-verified-group-why-is-it-experimental">
@ -361,7 +329,7 @@ attacker. All Messages in a verified chat view are e2e-encrypted, and
members can join by scanning a “QR invite code”. All members are thus members can join by scanning a “QR invite code”. All members are thus
connected with each other through a chain of invites, which guarantee connected with each other through a chain of invites, which guarantee
cryptographic consistency against active network or provider attacks. cryptographic consistency against active network or provider attacks.
See https://countermitm.readthedocs.io/en/latest/new.html See <a href="https://countermitm.readthedocs.io/en/latest/new.html">countermitm.readthedocs.io</a>
for the R&amp;D behind this feature.</p> for the R&amp;D behind this feature.</p>
</li> </li>
<li> <li>
@ -387,6 +355,8 @@ are we remove the “experimental” label not too far in the future.</p>
<li>As you’re no longer a group member, you cannot add yourself again. <li>As you’re no longer a group member, you cannot add yourself again.
However, no problem, just ask any other group member in a normal chat to re-add you.</li> However, no problem, just ask any other group member in a normal chat to re-add you.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="i-do-not-want-to-receive-the-messages-of-a-group-any-longer"> <h3 id="i-do-not-want-to-receive-the-messages-of-a-group-any-longer">
@ -406,6 +376,8 @@ If you want to join the group again later on, ask another group member to add yo
can still write, but are no longer notified of any new messages.</p> can still write, but are no longer notified of any new messages.</p>
</li> </li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h2 id="encryption"> <h2 id="encryption">
@ -427,6 +399,8 @@ can still write, but are no longer notified of any new messages.</p>
<li>Yes. Delta Chat implements the Autocrypt Level 1 standard and can <li>Yes. Delta Chat implements the Autocrypt Level 1 standard and can
thus E2E-encrypt messages with other Autocrypt-capable apps.</li> thus E2E-encrypt messages with other Autocrypt-capable apps.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="what-do-i-have-to-do-to-activate-the-end-to-end-encryption"> <h3 id="what-do-i-have-to-do-to-activate-the-end-to-end-encryption">
@ -453,6 +427,8 @@ messages are not encrypted until an Autocrypt-compliant app is available again.<
use the corresponding setting in “Settings / Advanced settings”.</p> use the corresponding setting in “Settings / Advanced settings”.</p>
</li> </li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="if-end-to-end-encryption-is-not-available-is-the-connection-not-encrypted-at-all"> <h3 id="if-end-to-end-encryption-is-not-available-is-the-connection-not-encrypted-at-all">
@ -469,6 +445,8 @@ This only secures the connection between your device and your e-mail
server. Whereas e2e-encryption provides safety between server. Whereas e2e-encryption provides safety between
your device and a friend’s device.</li> your device and a friend’s device.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="how-can-i-verify-cryptographic-status-with-a-sender"> <h3 id="how-can-i-verify-cryptographic-status-with-a-sender">
@ -497,6 +475,8 @@ the connection is safe.</p>
<p>For transport encryption, this state is just shown there</p> <p>For transport encryption, this state is just shown there</p>
</li> </li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="how-can-i-check-the-encryption-of-messages"> <h3 id="how-can-i-check-the-encryption-of-messages">
@ -514,6 +494,8 @@ the connection is safe.</p>
<p>If there is <strong>no padlock</strong>, the message is usually transported unencrypted e.g. because you or the sender have turned off end-to-end-encryption, or the sender uses an app without support for end-to-end-encryption.</p> <p>If there is <strong>no padlock</strong>, the message is usually transported unencrypted e.g. because you or the sender have turned off end-to-end-encryption, or the sender uses an app without support for end-to-end-encryption.</p>
</li> </li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="which-standards-are-used-for-end-to-end-encryption"> <h3 id="which-standards-are-used-for-end-to-end-encryption">
@ -531,6 +513,8 @@ Delta Chat implements the “countermitm” protocols to achieve
protection against active network attacks, going beyond the opportunistic protection against active network attacks, going beyond the opportunistic
base protection of Autocrypt, see questions about “Verified Groups”.</li> base protection of Autocrypt, see questions about “Verified Groups”.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="what-is-the-difference-between-verified-groups-and-11-chats-with-verified-contacts"> <h3 id="what-is-the-difference-between-verified-groups-and-11-chats-with-verified-contacts">
@ -559,6 +543,8 @@ matter if they change e-mail clients, devices, setups etc. That’s why there
is no verification checkmark, even if you have verified the contact.</p> is no verification checkmark, even if you have verified the contact.</p>
</li> </li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="does-delta-chat-support-perfect-forward-secrecy"> <h3 id="does-delta-chat-support-perfect-forward-secrecy">
@ -577,18 +563,20 @@ Delta Chat private key is leaked, and someone has a record
of all your in-transit messages, they will be able to read them.</p> of all your in-transit messages, they will be able to read them.</p>
</li> </li>
<li> <li>
<p>Note that if anyone has seized or hacked your running phone, <p>Note that if anyone has seized or hacked your running phone, they will
they will typically be able to read all messages, no matter if Perfect typically be able to read all messages, no matter if Perfect Forward Secrecy
Forward Secrecy is in place or not. Having access to a single device is in place or not. Having access to a single device from a member of a group,
from a member of a group, will typically a lot of the social graph. will typically expose a lot of the social graph. Using e-mail addresses that
Using e-mail addresses that are not easily tracked back to persons are not easily tracked back to persons helps group members to stay safer from
helps group members to stay safer from the effects of device seizure.</p> the effects of device seizure.</p>
</li> </li>
<li> <li>
<p>We are sketching ways to protect communications better against the event <p>We are sketching ways to protect communications better against the event
of device seizure.</p> of device seizure.</p>
</li> </li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="how-does-delta-chat-protect-my-metadata"> <h3 id="how-does-delta-chat-protect-my-metadata">
@ -619,6 +607,8 @@ end-to-end-encryption protected, see also this upcoming <a href="https://datatra
RFC</a>.</p> RFC</a>.</p>
</li> </li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="can-i-re-use-my-existing-private-key"> <h3 id="can-i-re-use-my-existing-private-key">
@ -638,6 +628,8 @@ RFC</a>.</p>
</ul> </ul>
<p>If you don’t have a key or don’t even know you would need one - don’t worry: Delta Chat generates one as needed, you don’t have to hit a button for it.</p> <p>If you don’t have a key or don’t even know you would need one - don’t worry: Delta Chat generates one as needed, you don’t have to hit a button for it.</p>
<p><a href="#top">↑ Top</a></p>
<h3 id="i-cant-import-my-existing-pgp-key-into-delta-chat"> <h3 id="i-cant-import-my-existing-pgp-key-into-delta-chat">
@ -665,6 +657,8 @@ password to an empty value in the Key Management window. With GnuPG you can set
it <a href="https://github.com/deltachat/deltachat-android/issues/98#issuecomment-378383429">via the command it <a href="https://github.com/deltachat/deltachat-android/issues/98#issuecomment-378383429">via the command
line</a>. line</a>.
For other programs, you can find a solution online.</p> For other programs, you can find a solution online.</p>
<p><a href="#top">↑ Top</a></p>
<h3 id="why-dont-you-use-pep-pretty-easy-privacy"> <h3 id="why-dont-you-use-pep-pretty-easy-privacy">
@ -679,6 +673,8 @@ For other programs, you can find a solution online.</p>
a discussion of Autocrypt and pEp, see the <a href="https://autocrypt.org/faq.html#how-does-autocrypt-differ-from-pep">Autocrypt a discussion of Autocrypt and pEp, see the <a href="https://autocrypt.org/faq.html#how-does-autocrypt-differ-from-pep">Autocrypt
FAQ</a>.</li> FAQ</a>.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h2 id="multiclient"> <h2 id="multiclient">
@ -713,6 +709,8 @@ arrive and click on it, which should prompt you for the security number.</p>
sending and receiving E2E-encrypted messages with your communication partners.</p> sending and receiving E2E-encrypted messages with your communication partners.</p>
</li> </li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h2 id="miscellaneous"> <h2 id="miscellaneous">
@ -734,6 +732,8 @@ sending and receiving E2E-encrypted messages with your communication partners.</
<li>With a rather good chance: Yes :)<br /> <li>With a rather good chance: Yes :)<br />
However, some providers need special options to work properly; users have collected some of them in the forum at <a href="https://support.delta.chat/t/provider-overview/">Provider Overview</a></li> However, some providers need special options to work properly; users have collected some of them in the forum at <a href="https://support.delta.chat/t/provider-overview/">Provider Overview</a></li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
<h3 id="im-interested-in-the-technical-details-can-you-tell-me-more"> <h3 id="im-interested-in-the-technical-details-can-you-tell-me-more">
@ -747,36 +747,10 @@ However, some providers need special options to work properly; users have collec
<li>See <a href="https://github.com/deltachat/deltachat-android/blob/master/standards.md#standards-used-in-delta-chat">Standards used in Delta Chat</a>.</li> <li>See <a href="https://github.com/deltachat/deltachat-android/blob/master/standards.md#standards-used-in-delta-chat">Standards used in Delta Chat</a>.</li>
</ul> </ul>
<p><a href="#top">↑ Top</a></p>
</div>
<div id="footer"> </body></html>
<p>
<a href="references">References</a> | <a href="imprint">Imprint</a>
| <a href="/de/gdpr-website">Privacy Policy</a>
<br>
<span class="desktoponly">Language:</span>
<a href="../ca/">CA</a> |
<a href="../de/">DE</a> |
<a href="../en/">EN</a> |
<a href="../es/">ES</a> |
<a href="../fr/">FR</a> |
<a href="../it/">IT</a> |
<a href="../nb/">NB</a> |
<a href="../pl/">PL</a> |
<a href="../pt/">PT</a> |
<a href="../ru/">RU</a> |
<a href="../sq/">SQ</a> |
<a href="../uk/">UK</a>
<br>
© 2017-2019 Delta Chat contributors
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