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net
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: 
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EM ROF SKROW
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 Works for you 
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 net2o onion routing 
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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, 33c3, Hamburg
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Outline
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Motivation
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Motivation
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3.5 years after Snowden
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What happend to change the world:
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Politics 
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Post
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truth as excuse for censorship
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Crypto
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Wars
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4.0 another 
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we need to look under every bed to search for monsters
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\begin_layout Description
Legalize
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it (dragnet surveillance)
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Kill
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the
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link LG Hamburg imposes obligations on link setters
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\begin_layout Description
Competition face Stasi style 
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Zersetzung
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 like the Tor project
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\begin_deeper
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Solutions net2o starts to be usable (it 
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em rof skrow
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)
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Where are the defects?
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Bugs by phase 
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key "hse238"

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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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Path switched packets with 
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 size writing into shared memory buffers
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\begin_deeper
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\end_deeper
\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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Timing driven delay minimizing flow control
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Stack–oriented tokenized command language
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\begin_deeper
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Distributed data (files) and distributed metadata (DHT)
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\end_deeper
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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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EM ROF SKROW
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: Progress Report
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EM ROF SKROW
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: Progress Report
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PKI Create, import, and exchange keys
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\begin_deeper
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Permissions Individual permission bits per key, permission groups
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\begin_layout Description
Hashed
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file
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copy Access to big files by hash
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Description
Vault A container for encrypted data without metadata exposure
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\begin_deeper
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\end_layout

\end_deeper
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DHT Query key/value pairs (keys are pubkeys or hash keys)
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\begin_deeper
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\begin_layout Description
Chat Instant messaging 1:1 or in chat groups
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\end_deeper
\begin_layout Description
Version
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control
\begin_inset space ~
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system For larger content
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\begin_deeper
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\end_layout

\end_deeper
\begin_layout Description
Sync to synchronize your computers (RSN)
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Description
Audio/Video
\begin_inset space ~
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Chat Real time data streaming (RSN)
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\end_deeper
\begin_layout Standard
\begin_inset Separator parbreak
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\end_layout

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\begin_inset Argument 4
status open

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Color QR
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For easy key exchange, scan a color QR image (work in progress)
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\align center
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	filename colorqr.png
	height 60theight%

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Works for You
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Get it: Debian and Android
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Debian
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\begin_deeper
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To use the Debian package, enter as root:
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\size small
cat >/etc/apt/sources.list.d/net2o.list <<EOF
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deb [arch=amd64,all] http://net2o.de/debian testing main
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EOF
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wget -O - https://net2o.de/bernd@net2o.de.gpg.asc | 
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apt-key add -
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aptitude update; aptitude install net2o
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Android
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Get Gforth from play store or 
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https://net2o.de/Gforth.apk
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\family default
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Open/close (back button) Gforth if you like; then open net2o.
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Get it: Windows and macOS
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Windows
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\end_layout

\begin_deeper
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Get the two current setup.exes for Gforth and net2o, and install them in
 that order:
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\family typewriter
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\begin_inset Flex URL
status open

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http://www.complang.tuwien.ac.at/forth/gforth/Snapshots/current/gforth64.exe
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\begin_inset Flex URL
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https://net2o.de/windows/net2o64.exe
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\begin_inset Argument 2
status open

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MacOS
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Once I got around creating a brew tap, it will be easy to install under
 MacOS, too.
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\end_deeper
\end_deeper
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status open

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Get it from Source
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\begin_deeper
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status open

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From
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Source
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\begin_deeper
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for Linux, Mac OS X, Windows (cygwin) you need:
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\family typewriter
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git automake autoconf make gcc libtool libltdl7 fossil
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\series default
you run:
\series bold
 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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\family default
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This will install some stuff and take some time
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\end_deeper
\end_deeper
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\begin_layout Section
Outlook: Onion Routing
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State of the Art
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\begin_deeper
\begin_layout Description
Tor Circuit switched onion router with a number of weaknesses:
\end_layout

\begin_deeper
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\end_layout

\begin_layout Itemize
centralized directory servers
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
\begin_inset Quotes eld
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circuit
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 used long enough for correlation attacks
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
NSA project, EFF version's primary goal apparently to generate cover traffic
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\end_deeper
\begin_layout Description
I2P Architecture similar to Tor, but
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\begin_deeper
\begin_layout Pause

\end_layout

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optimized for 
\begin_inset Quotes eld
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hidden services
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\begin_deeper
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\end_layout

\end_deeper
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packet switched instead of circuit switched
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\end_deeper
\end_deeper
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\begin_inset Separator parbreak
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\end_layout

\begin_layout Frame
\begin_inset Argument 4
status open

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Goals for net2o Onion Routing
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\begin_deeper
\begin_layout Enumerate
Limited to net2o 
\begin_inset Formula $\longleftrightarrow$
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 net2o
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Enumerate
Create a circuit mesh, and then switch quickly, using net2o's fast handover
\end_layout

\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Enumerate
Leverage net2o's inherent capabilities to reduce possible timing attacks
\end_layout

\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Enumerate
Avoid legal problems of especially exit nodes by not exiting
\end_layout

\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Enumerate
If you want content from outside net2o's world, share the imported content
 as net2o files/dvcs projects
\end_layout

\end_deeper
\begin_layout Standard
\begin_inset Separator parbreak
\end_inset


\end_layout

\begin_layout Frame
\begin_inset Argument 4
status open

\begin_layout Plain Layout
Implementation plan
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\begin_deeper
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Add a header field for 
\begin_inset Formula $n$
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 encrypted paths (
\begin_inset Formula $n=4$
\end_inset

 seems to be a good choice)
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
Block cipher decryption and encryption can be interchanged\SpecialChar ldots
 use AES since
 fast hardware accelerated AES is available
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
On arrival, try–decrypt/encrypt the first path with negotiated keys from
 that source and verify authenication
\end_layout

\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
Decrypt or encrypt (depending on direction) the rest of the packet with
 that key
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
Shift the path list by one and insert return path (properly encrypted/decrypted)
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
At the 
\begin_inset Quotes eld
\end_inset

connect node:
\begin_inset Quotes erd
\end_inset

 connect both ends, i.e.
 flip and remember the incoming path list, and replace it with the outgoing
 path list.
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\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
While you are connected, the other side tells you several connect nodes,
 which you can use
\end_layout

\end_deeper
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\end_inset


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\begin_layout Section*
\start_of_appendix
Appendix
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For Further Reading
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allowframebreaks
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For Further Reading
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net2o source repository and wiki 
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ealth & Safety Executive HSE – UK
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Out of control, 2nd edition 2003
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