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net
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}
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: Make it Userfriendly
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net2o
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\begin_layout Subtitle
reinventing the internet
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\begin_layout Author
Bernd Paysan
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#wefixthenet, YBTI session, 32c3, Hamburg
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~~~}}}
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Outline
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Motivation
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2.5 years after Snowden
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What happend to change the world:
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Politics Manhatten project to find 
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the golden key
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?
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\begin_deeper
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Users don't want their dick picks be watched and use DuckDuckGo and encrypted
 chat
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\begin_deeper
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Software NSA backdoors have been refitted by attackers (Juniper)
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Solutions net2o starts to be usable (somewhat)
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net2o in a nutshell
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net2o consists of the following 6 layers (implemented bottom up):
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[
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Path switched packets with 
\begin_inset Formula $2^{n}$
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 size writing into shared memory buffers
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\begin_deeper
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\end_layout

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\begin_layout Enumerate
Ephemeral key exchange and signatures with Ed25519, 
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symmetric authenticated encryption+hash+prng with Keccak,
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symmetric block encryption with Threefish
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onion routing camouflage probably with AES
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\begin_deeper
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Timing driven delay minimizing flow control
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\begin_deeper
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\end_layout

\end_deeper
\begin_layout Enumerate
Stack--oriented tokenized command language
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\begin_deeper
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\end_layout

\end_deeper
\begin_layout Enumerate
Distributed data (files) and distributed metadata (prefix hash trie)
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Apps in a sandboxed environment for displaying content
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Objectives
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net2o's design objectives are
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lightweight, fast, scalable
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easy to implement
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secure
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media capable
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works as overlay on current networks (UDP/IP), but can replace the entire
 stack
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\begin_layout Section
Level 7: Applications
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Basic Frameworks
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Basic Frameworks
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PKI Create, import, and exchange keys
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Named
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file
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copy For testing only
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Vault A container for encrypted data without metadata exposure
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DHT Query key/value pairs (keys are pubkeys or hash keys)
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Chat Instant messaging 1:1 or in chat groups
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Version
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control
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system For larger content (not yet implemented) 
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Sync to synchronize your computers (RSN)
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Audio/Video
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Chat Real time data streaming (RSN)
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Try it
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Try it
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Linux you need:
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git automake autoconf make gcc libtool libltdl7 fossil
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you run:
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 mkdir net2o; cd net2o
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wget https://fossil.net2o.de/net2o/doc/trunk/do
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chmod +x do; ./do
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This will install some stuff and take some time (I will try to improve that).
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Android Get Gforth from play store or 
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https://net2o.de/Gforth.apk
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Open/close (back button) Gforth if you like; then open net2o.
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Try it --- Generate a Key
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Linux you run:
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./n2o cmd
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keygen
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<nick>
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Enter your passphrase twice.
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Android Tap on the little nettie to start the app, it will autodetect that
 you don't have a key generated.
 Enter nick and passphrase twice.
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Try it --- Get another Key
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To get my key, search for it (32 bit is sufficient)
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keysearch
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kQusJ
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Try to chat with me
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chat 32c3@bernd
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Aquire more keys by observing a group chat.
 List your keys with
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n2o keylist
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from within the chat.
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Change networks with your Android and watch that the chat still works.
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GUI framework
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Apps in a Sandbox
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Content or Apps?
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The current web is defined by content --- web apps (JavaScript) are an afterthou
gh
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Therefore, the application logic is usually on the server side
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This doesn't work for a P2P network!
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Content is structured text, images, videos, music, etc.
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App--Centric World
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There's a phenomenon I call 
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Turing creep
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: Every sufficiently complex system contains a user--accessible Turing--complete
 language
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Corollary: Every efficient sufficiently complex system can execute native
 machine code
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The application logic is to present the data; data itself is as above: structure
d text, images, videos, music, etc.
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Executing (especially efficient) code from the net raises obvious questions
 about security
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How to securely execute code?
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There are several options tried; as usual, things are broken:
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Execute code in a controlled secure VM, see for example Java.
 This is broken by design, as securing something from the inside doesn't
 work.
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Execute code in a sandbox.
 This has shown as more robust, depending on how complex the outside of
 the sandbox is.
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Public inspection of code.
 This is how the open source world works, but the underhanded C contest
 shows that inspection is tricky.
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Scan for known evil code.
 This is the security industry's approach, and it is not working.
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Code signing can work together with public inspection --- but using it for
 accountability doesn't work
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Therefore the choice is to sandbox public inspected code.
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API Basics
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Formats&Requirements
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How to display things
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Why OpenGL?
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OpenGL can do everything
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OpenGL renders:
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Triangles, lines, points --- simple components
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Textures and gradients
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and uses shader programs --- the most powerful thing in OpenGL from 2.0.
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Real requirement: visualization of 
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 OpenGL can do that.
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How to connect the media?
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Lemma: every glue logic will become Turing complete
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currently used glue: HTML+CSS+JavaScript
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containers with Flash, Java, ActiveX, PDF, Google's NaCl\SpecialChar \ldots{}

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conclusion: use a powerful tool right from start!
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browser: run--time and development tool for applications
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Frameworks
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libsoil for images (PNG+JPEG loading into a texture)
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freetype-gl for fonts (TrueType/OpenType into a texture)
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OpenMAX on Android, gstreamer on Linux: videos into a texture
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MINOΣ2: Lightweight OpenGL--based widget library in Forth (still a lot of
 work in progress)
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Appendix
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For Further Reading
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For Further Reading
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key "In20"

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\noun on
Bernd Paysan 
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net2o source repository and wiki 
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http://fossil.net2o.de/net2o
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