Decentral Messaging (#1)

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node_modules
public

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image: monachus/hugo
variables:
GIT_SUBMODULE_STRATEGY: recursive
pages:
script:
- hugo
artifacts:
paths:
- public
only:
- master

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[submodule "themes/reveal-hugo/static/reveal-js"]
path = themes/reveal-hugo/static/reveal-js
url = https://github.com/hakimel/reveal.js.git
[submodule "themes/reveal-hugo/static/highlight-js"]
path = themes/reveal-hugo/static/highlight-js
url = https://github.com/highlightjs/highlight.js.git

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logo : https://ccchb.de/logo/CCCHB-logo_256x256_bw.png
footnote : "Chaos Computer Club Bremen e.V."
layout : top-left
theme : black
highlight : ir-black
theme-override : custom.css
transition : none
published : true
code-line-numbers : true

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## Presentations:
2018:
- [Dezentrales Messaging](https://ccchb.github.io/presentations/decentral_messaging)
## Create a presentation
Run: `hugo server -D`
Create a new presentation `content/<NAME>/_index.md`
Browser: http://localhost:1313/presentations/<NAME>
## Update
```
hugo
cd public
git add --all
git commit -m "Publishing to gh-pages"
git push origin gh-pages
cd ..
```

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---
title: "{{ replace .Name "-" " " | title }}"
date: {{ .Date }}
outputs:
- "Reveal"
draft: true
---

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baseURL = "https://ccchb.github.io/presentations/"
languageCode = "en-us"
title = "Presentation from CCCHB"
disableKinds = ["sitemap", "RSS"]
theme = "reveal-hugo"
[params.reveal_hugo]
history = true
highlight_theme = "qtcreator_dark"
margin = 0.2
custom_theme = "css/main.css"
transition = "slide"
transition_speed = "fast"
[outputFormats.Reveal]
baseName = "index"
mediaType = "text/html"
isHTML = true

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content/_index.md Normal file
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---
title: "Presentations from CCCHB"
outputs:
- "Reveal"
---
# Presentations
- [Decentrales Messaging](./decentral_messaging)

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---
title: "Dezentrale Messenger"
outputs:
- "Reveal"
---
<h2 style="white-space: nowrap;">Dezentrale Messenger</h2>
<br/>
<h4 style="white-space: nowrap;">The very last word in instant messaging</h4>
(Motto vom XMPP-Client Converations)
<span class="text-reboot">genofire - Chaos Computer Club Bremen e.V.</span>
---
## Agenda
- Dezentralität
- XMPP - Der Standard
- Software (Client und Server)
- Ist der Hoster gut
- Verschlüsselung
- Ausblick
- Alternativen
---
## Dezentralität
- **Peer-to-Peer**
Geräte tauschen direkt miteinander Nachrichten aus (ohne eine zentrale Componente)
- **Federation**
Kommunikation über zentrale Komponenten
{{% note %}}
**P2P**
- Postkasten, jeder kann zum Empfänger gehen und selbst etwas in den Kasten werfen.
(wenn es keine Post gibt)
**Federation**
- E-Mail (ISP: benutzer@hoster.de)
- Telefonnummern (Addr: hat oftmals die ersten Ziffern für sich reserviert)
{{% /note %}}
---
## Dezentralität
#### Warum notwendig?
- Eröffnet ein Wettbewerb
- kleine und viele Angriffsziele
- vor Kriminelle
- vor Regierungen
- alle Überwachen
- blockieren / sperren (Zensur)
- Verringert Missbrauch durch Vertrauen
{{% note %}}
- _Eröffnet einen Wettbewerb:_ damit fortschritt
(Gewinne gehen zum größten Teile in die USA)
- Entscheidungen: z.B. nur noch auf Englisch, Mark Zuckerberg darf Nachrichten löschen
- _Angriffsziele:_
- Hacker können nicht alle Server kompromentieren
- Regierungen können nicht
- den Zugang zu allen Servern verlangen (NSA - Snowden)
- alle Server blockieren (Telegram - Russland)
- _Verringert Missbrauch durch Vertrauen_
- **Auswirkung:** nicht alle Daten können **geklaut** oder **analysiert** werden
- Analysiert zur Manipulation (Werbung oder politisch, siehe Cambridge Analytica)
- **Bei Missbrauch** leichterer Wechsel
{{% /note %}}
---
## Dezentralität
#### Nachteile
- Komplexität steigt
- Gewollte Verringerung an Marktanteil
- Kann auch von kriminellen Elementen genutzt werden
- Nutzer müssen sich ggf. sich Ihre Adresse und Passwort sich merken
{{% note %}}
- _Komplexität steigt:_ Da nicht nur Clients, sondern auch Server untereinander sicher (Ausfall, vertrauensvoll) kommunizieren müssen.
- _kriminellen Elementen:_ wie bei jeder Technologie kann diese auch von Bösen genutzt werden.
- _... sich merken:_ allerdings müssen Sie dies auch für Ihre E-Mail-Adresse, was noch Standard im Internet ist.
{{% /note %}}
---
### Extensible Messaging and Presence Protocol (XMPP)
- Existiert seit 1999 (unter den Namen Jabber)
- IETF Standard seit 2002
- Google Talk 2005 - 2013 (entwickelte Jingle)
- Facebook 2010 - 2014
- WhatsApp nutzt es intern
{{% note %}}
- Jingle:
- Aushandlung von Datenverbindung (angelehnt an SIP)
- für: Datenaustausch, Video/Voice-Chat, ...
{{% /note %}}
---
## XMPP
#### Adressierung
JID (Jabber ID) genannt:
```
node@domain/ressource
```
URI-Format: (falls MUC mit `?join` am Ende)
```
xmpp:node@domain?join
```
{{% note %}}
- MUC (Multi User Chat): Gruppenchat
**Als User**
- benutzer@server/gerät
**In MUC**
- chatraum@muc-server/nickame
**Transport**
- ganz unterschiedlich
{{% /note %}}
---
## XMPP
**Message**
```xml
<message from="geno@fireorbit.de"
to="#ccchb@irc.hackint.org" type="groupchat">
Hello World
</message>
```
Types:
- chat
- groupchat
- headline
- normal
- error
---
## XMPP
**Present**: Aktuelle Live Informationen
```xml
<present to="#ccchb@irc.hackint.org" type="subscribe">
</present>
```
Types:
- error
- probe
- subscribe(d)
- unavailable
- unsubscribe(d)
---
## XMPP
**IQ** (Instant Query): Abfragen mit Rückantworten
```xml
<iq to="irc.hackint.org" type="get">
<ping xmlns='urn:xmpp:ping'/>
</iq>
```
Types:
- get
- set
- result
- error
{{% note %}}
- Die Inhalte, die in diesen XML-Elementen drin sind, werden im RFC nicht vorgegeben und kann für viele Funktionen genutzt werden.
{{% /note %}}
---
## Software <small>Clients</small>
#### Empfehlungen:
- Conversations (Android)
- Pix-Art Messenger
- ChatSecure (iPhone)
- Gajim (Desktop)
- ConverseJS (WebClient)
- Viele mehr
- mit [OMEMO](https://omemo.top)
- [alle](https://xmpp.org/software/clients.html)
---
## Software <small>Clients</small>
Bombus - Client in J2ME für normale Telefone
<center>
<img width="50%" src="img/j2me-bombus.jpg" alt="Wikipedia - Article Java"/>
</center>
---
## Software <small>Server</small>
- **prosody** in lua
- leicht erweiterbar
- riesige Sammlung an erweiterbaren Modulen (die man nutzen muss)
- **ejabberd** (Fork: mongooseIM) in erlang
- besitzt alle nötigen Funktionen von Haus aus
- sehr gut gewartet
- **OpenFire** in Java
---
## Ist der Hoster gut
Tools zum Testen des Servers (Auswahl an Servern)
- [Compliance](https://compliance.conversations.im/) ([support Alles](https://compliance.conversations.im/api/compliant_servers/) / API)
- [Status](https://status.conversations.im/historical/) für S2S + Uptime
XEPs:
- PEP / PubSub
- MAM (für MUC)
- HTTP-Upload
- DNS-SRV for TLS (HTTPS)
{{% note %}}
- Personal Eventing Protocol: Geolocation, Mood, Activity, Tune
- Message Archive Management:
- Vorteil gegenüber: Threema und WhatsApp (mit OMEMO auch gegenüber Telegram)
- OMEMO: Neue Geräte können alte Nachrichten nicht entschlüsseln
- HTTP-Upload: Offline und in MUC Datenaustausch
- "umgeht" Firewalls
{{% /note %}}
---
## XMPP
### Verschlüsselung
- Off-The-Record
- OpenPGP
- OX
- OMEMO
Detailert: [here](https://conversations.im/omemo)
{{% note %}}
- Neben TLS (SSL)
{{% /note %}}
---
## XMPP <small>Verschlüsselung</small>
- Geräte erstellt **asynchrones** Schlüsselpaar
- öffentlichen Schlüssel wird per PubSub auf dem Server hinterlegt
- Kontakte werden durch PEP / PubSub über neuen Schlüssel informiert
- Dieser muss diesen öffentlichen Schlüssel laden
{{% note %}}
- synchrone: Entspricht einem Passwort, was allen Gesprächsteilnehmern bekannt ist.
- asynchrone: mathematisches Verfahren mit Schlüsselpaaren (öffentlicher und privater Schlüssel)
- Kontakte = Roster
- den **neuen oder weiteren** öffentlichen Schlüssel
- Signiert und verschlüsselt
- zurückziehen des Schlüssels
{{% /note %}}
---
<center>
<h1>Demo</h1>
[Anleitung](https://media.kuketz.de/blog/artikel/2016/conversations/Anleitung_Conversations_V1.1_CC-BY-SA.pdf)
</center>
---
## Ausblick
- Transports
- Biboumi: IRC
- Spectrum2: e.g AIM, ICQ, MSN, Yahoo, Telegram, Twitter, "WhatsApp"
- PubSub
- Blogging / Posting (siehe Movim)
- Commands
- Internet of Things
[XEP-Liste](https://xmpp.org/extensions/) letzter Eintrag: XEP-0410: MUC Self-Ping (Schrödinger's Chat)
{{% note %}}
- Transport WhatsApp Warnung, vor Protokolländerungen und Sperrungen
{{% /note %}}
---
## Alternativen zu XMPP
#### Peer-to-Peer
- Nutzen das Tor-Netzwerk
- **Tox**
- **Briar**
- kann auch Local per Wifi und Bluetooth genutzt werden
- ... (viele mehr)
- libp2p
- (mir sonst keine Weiteren bekannt ...)
---
## Alternativen zu XMPP
#### Federation
- **Matrix** (Riot):
- Änderungsvorschläge am Protokoll werden durch das Unternehmen entschieden
- (mir sonst keine Weiteren bekannt ...)
---
<center>
<h1>Ende</h1>
<a href="https://www.ccc.de/de/hackerethik"><h4>Hackerethik</h4></a>
**3. Mißtraue Autoritäten fördere Dezentralisierung.**
</center>

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reusable = '''
## Reusable slides
Store markdown in a [data template](https://gohugo.io/templates/data-templates/) and reuse it in multiple sections or presentations.
<br>
<small>
navigate down to learn more
</small>
<br>
<a href="#" class="navigate-down">🔽</a>
---
Add a `example` key to data/home.toml:
```toml
example = "I'm a slide"
```
<br>
Set the `content` attribute to "home.example":
```markdown
---
{{< slide content="home.example" >}}
---
```
---
💡 Each data template entry can contain one or more slides, separated by `---` with newlines.
---
💡 All other slide shortcode attributes (background, transition, etc.) can be used and will be applied to each slide in the data template entry.
'''

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publish = "public"
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MIT License
Copyright (c) 2018 Josh Dzielak
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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<!doctype html>
{{- $reveal_cdn := $.Param "reveal_hugo.reveal_cdn" | default "reveal-js" -}}
{{- $highlight_cdn := $.Param "reveal_hugo.highlight_cdn" | default "highlight-js/src/styles" -}}
<html lang="en">
<head>
<meta charset="utf-8">
<title>{{ or .Page.Title .Site.Title }}</title>
{{ with $.Param "description" }}<meta name="description" content="{{ . }}">{{ end }}
{{ with .Site.Author.name }}<meta name="author" content="{{ . }}">{{ end }}
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="{{ $reveal_cdn | absURL }}/css/reveal.css">
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{{- $theme := $.Param "reveal_hugo.theme" | default "black" -}}
{{- $custom_theme := $.Param "reveal_hugo.custom_theme" -}}
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{{- $sectionHeadPartial := printf "%s/reveal-hugo/head" (.Page.Section | default "home") -}}
{{- if fileExists (printf "layouts/partials/%s.html" $sectionHeadPartial) -}}{{ partial $sectionHeadPartial . }}{{- end }}
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<body>
<div class="reveal">
<div class="slides">
{{- block "main" . -}}{{- end -}}
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create layouts/partials/reveal-hugo/end.html -->
{{- partial "reveal-hugo/end" . -}}
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create layouts/partials/{section}/reveal-hugo/end.html -->
{{- $sectionHeadPartial := printf "%s/reveal-hugo/end" (.Page.Section | default "home") -}}
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<script type="text/javascript"> window.revealHugoDependencies = { dependencies: [ { src: '{{ $reveal_cdn | absURL }}/lib/js/classList.js', condition: function() { return !document.body.classList; } },
{ src: '{{ $reveal_cdn | absURL }}/plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: '{{ $reveal_cdn | absURL }}/plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: '{{ $reveal_cdn | absURL }}/plugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
{ src: '{{ $reveal_cdn | absURL }}/plugin/zoom-js/zoom.js', async: true },
// the notes plugin can't run off the CDN b/c the HTML file isn't there
{ src: '{{ "reveal-js/plugin/notes/notes.js" | relURL }}', async: true }
]};
</script>
<script src="{{ $reveal_cdn | absURL }}/lib/js/head.min.js"></script>
<script src="{{ $reveal_cdn | absURL }}/js/reveal.js"></script>
<script type="text/javascript">
// Hugo lowercases all params and Reveal.js needs camelcase
// So params in Hugo must be stored in snakecase and we camelize them here
function camelize(map) {
if (map) {
Object.keys(map).forEach(function(k) {
newK = k.replace(/(\_\w)/g, function(m) { return m[1].toUpperCase() });
if (newK != k) {
map[newK] = map[k];
delete map[k];
}
});
}
return map;
}
// pattern inspired by https://github.com/RealOrangeOne/hugo-theme-revealjs
var revealHugoDefaults = { center: true, controls: true, history: true, progress: true, transition: "slide" };
var revealHugoSiteParams = JSON.parse(document.getElementById('reveal-hugo-site-params').innerHTML);
var revealHugoPageParams = JSON.parse(document.getElementById('reveal-hugo-page-params').innerHTML);
// See all options - https://github.com/hakimel/reveal.js#configuration
var options = Object.assign({},
camelize(revealHugoDefaults),
camelize(revealHugoSiteParams),
camelize(revealHugoPageParams),
revealHugoDependencies);
Reveal.initialize(options);
</script>
<!-- To insert markup before the closing body tag for all presentations,
create layouts/partials/reveal-hugo/body.html -->
{{- partial "reveal-hugo/body" . }}
<!-- To insert markup at the end of the head tag for a specific presentation,
create layouts/partials/{section}/reveal-hugo/body.html -->
{{- $sectionBodyPartial := printf "%s/reveal-hugo/body" (.Page.Section | default "home") -}}
{{- if fileExists (printf "layouts/partials/%s.html" $sectionBodyPartial) -}}{{ partial $sectionBodyPartial . }}{{- end }}
</body>
</html>

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{{ define "main" }}
{{ partial "reveal-hugo/slides" (union (slice .Page) (where .Data.Pages "Type" "home")) }}
{{ end }}

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{{ define "main" }}
{{ partial "reveal-hugo/slides" (union (slice .Page) .Pages) }}
{{ end }}

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<!-- override this partial to add content before the body tag closes -->

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<!-- override this partial to add content before the .reveal tag closes -->

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<!-- override this partial to add content before the head tag closes -->

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<!-- Use the array of pages passed as a param -->
{{ range . -}}
<!-- Don't process empty content files -->
{{- if ne (len .Content) 0 -}}
<!-- Remove the <hr /> tag generated by blackfriday for footnotes -->
{{- $content := replace .Content "<div class=\"footnotes\">\n\n<hr />" "<div class=\"footnotes\">" -}}
<!-- Split the processed content by <hr /> tag -->
{{- range (split $content "<hr />") -}}
<!-- Only wrap in <section> tag if not already wrapped by shortcode -->
{{- if not (in . "data-noprocess") -}}
<section>
{{- end -}}
{{- . | safeHTML -}}
</section>
{{- end -}}
{{- end -}}
{{- end }}

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<span class='fragment {{ .Get "class" }}'
{{ with .Get "index" }}data-fragment-index='{{ . }}'{{ end }}>
{{ .Get "c" }}
</span>

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<span class='fragment {{ .Get "class" }}'
{{ with .Get "index" }}data-fragment-index='{{ . }}'{{ end }}>
{{ .Inner }}
</span>

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<section data-noprocess data-markdown
data-separator="^\r?\n---\r?\n$"
data-separator-vertical="^\r?\n------\r?\n$"
data-separator-notes="notes?:">
<script type="text/template">
{{ .Inner }}
</script>
</section>

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<aside class="notes">{{ .Inner }}</aside>

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<section data-shortcode-section>
{{ .Inner }}
</section>

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{{- $scratch := .Scratch -}}
{{- $scratch.Set "slides" slice -}}
{{- $content := .Get "content" -}}
{{- if $content -}}
{{- $lookup := split $content "." }}
{{- $html := index .Page.Site.Data (index $lookup 0) (index $lookup 1) | markdownify -}}
{{- $slides := split $html "<hr />" -}}
{{- range $slides -}}
{{- $scratch.Add "slides" . -}}
{{- end -}}
{{- else -}}
{{- $scratch.Add "slides" "" -}}
{{- end -}}
{{- $params := . -}}
{{- $noPrefix := slice "id" "class" -}}
{{- $noOutput := slice "content" "template" -}}
{{- $template := $params.Get "template" -}}
{{- if $template -}}
{{- $scratch.Add "templateParams" slice -}}
{{- with $.Site.Params.reveal_hugo.templates -}}
{{- $scratch.Add "templateParams" . -}}
{{- end -}}
{{- if ne $.Page.File.LogicalName "_index.md" -}}
{{- $scratch.Add "templateParams" ($.Site.GetPage $.Page.Section).Params.reveal_hugo.templates -}}
{{- end -}}
{{- with $.Page.Params.reveal_hugo.templates -}}
{{- $scratch.Add "templateParams" . -}}
{{- end -}}
{{- $scratch.Add "templateParams" (slice $.Page.Params.reveal_hugo.templates) -}}
{{- $templateParams := $scratch.Get "templateParams" }}
{{- range $templateParams -}}
{{- if (ne . nil) -}}
{{- range $key, $value := (index . $template) -}}
{{- $scratch.SetInMap "template" $key $value | safeHTMLAttr -}}
{{- end -}}
{{- end -}}
{{- end -}}
{{- end -}}
{{- range $sindex, $svalue := $scratch.Get "slides" }}
<section data-noprocess data-shortcode-slide
{{- if $template -}}
{{- range $key, $value := ($scratch.Get "template") }}
{{- $attrName := cond (in $noPrefix $key) $key (delimit (slice "data" $key) "-") }}
{{ $attrName | safeHTMLAttr }}="{{ $value }}"
{{- end }}
data-template="{{ $template }}"
{{- end -}}
{{- range $key, $value := $.Params -}}
{{- if not (in $noOutput $key) -}}
{{- $attrName := cond (in $noPrefix $key) $key (delimit (slice "data" $key) "-") }}
{{ $attrName | safeHTMLAttr }}="{{ $value }}"
{{- end -}}
{{- end -}}>
{{ $svalue | safeHTML }}
{{- if ne $sindex (sub (len ($scratch.Get "slides")) 1) -}}
</section>
{{- end -}}
{{- end -}}

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Subproject commit 3d5a9e5850760a376094418972e07b49783835fa

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Subproject commit c35cce54a5d4800b90e71a43da140c0347308989

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name = "reveal-hugo"
license = "MIT"
licenselink = "https://github.com/dzello/reveal-hugo/blob/master/LICENSE"
homepage = "https://reveal-hugo.dzello.com/"
tags = ["presentation", "revealjs"]
features = ["presentation"]
[author]
name = "Josh Dzielak"
homepage = "https://dzello.com/"
[original]
name = "reveal.js"
homepage = "https://revealjs.com"
repo = "https://github.com/hakimel/reveal.js/"