#+TITLE:     Secure Share
#+AUTHOR:    Daniel Reusche and Gabor Toth
#+LANGUAGE:  en
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* Introduction

** Secure Share

*** Secure Share
A framework for secure and privacy-protecting social interaction based on
peer-to-peer technology

#** Federation - Unicast                                            :noexport:
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#[[./img/unicast.png]]

*** Goals
**** arbitrary messanging 
***** from one-to-one to many-to-many
***** status updates and messages
**** file transfer
***** sharing of pictures, music etc.
***** collaborative document editing
** Privacy

*** Privacy
#+BEGIN_CENTER
#+LaTeX: \textbf{\Huge{Privacy}}
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*** Ideal Case
[[../img/unicast.png]]
*** Centralized services
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[[../img/cloud.png]]
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*** Privacy requirements
**** end-to-end encryption
**** forward secrecy
**** padding of packets
**** delayed forwarding
**** private contact list
**** free and open source software
*** Approach: federated systems

\textbf{\Large{And why not to use them}}
**** personal data on servers
**** personal data shared with even more server operators
**** only link-level encryption
**** PGP, OTR not enough

** Scalability

*** Scalability
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#+LaTeX: \textbf{\Huge{Scalability}}
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*** Social interaction
**** one-to-many status updates
**** many-to-many group communication

*** Multicast

#+BEGIN_CENTER
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[[../img/multicast.png]]
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* Architecture

** Architecture

*** Architecture

#+BEGIN_CENTER
#+LaTeX: \textbf{\Huge{Architecture}}
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** Peer-to-Peer

*** Friend-to-friend architecture
**** connect to trusted nodes
**** prevents active attacks

*** Personal devices
**** Software runs on personal devices
**** Data is stored on personal devices

*** Personal devices
**** laptop, PC
**** plug computers, home routers, servers
**** smartphones

*** Peer-to-peer framework requirements
**** free/libre/open-source software
**** multi-platform, lightweight, written in a compiled language
**** provides API for essential P2P features
***** bootstrapping, addressing, routing, encryption, NAT traversal

*** GNUnet
**** written in C
**** multi-platform
**** modular framework
**** advanced NAT traversal

*** GNUnet
**** multiple transport methods
***** TCP, UDP
***** HTTP, HTTPS
***** SMTP
***** ad-hoc WiFi

*** GNUnet
**** distributed hash table (DHT)
**** file sharing
***** based on DHT and GAP
**** various routing schemes
***** fish-eye bounded distance vector protocol
****** gossiping in a limited neighborhood
****** improves connectivity
****** onion routing
***** mesh service
****** supports multicast
****** uses DHT for routing

*** psycd

**** messaging protocol
**** manages connections, friendship between users
**** client interface

*** GNUnet - components and message flow

#+BEGIN_CENTER
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[[./gnunet-h.png]]
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** Implementation

*** Implementation

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*** Components

**** libpsyc

**** psycd

**** GNUnet libraries

*** Identifiers

**** Federated PSYC

***** based on DNS

: psyc://example.net/~alice#friends

**** P2P PSYC

***** based on public key

: psyc://I0GC...L29G:g/#friends

*** Contacting peers

**** initial contact: hello message

***** public key

***** current addresses

**** next time contact to same address

**** or find new address through other peers

*** Circuits

**** GNUnet

**** TCP

**** UNIX domain sockets

**** TLS

*** Entities

**** person
***** clients link to person entity
***** can subscribe other entities

**** place
***** group communication
***** news feeds

*** Multicast contexts

[[./context.png]]

*** Distributed state

**** profile data, context membership

**** push changes once

**** synchronize after subscription

**** recover lost packets

**** syntax changes to support more complex data structures

*** Storage

**** incoming and outgoing packets

**** state variables

**** SQLite database

***** multiplatform

***** lightweight

***** small memory footprint

* Clients

** Clients

*** Clients

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*** Desktop clients

**** secushare
***** based on Qt/QML
***** multiplatform
***** touch UI

**** irssyc
***** based on irssi
***** intended for debugging and for advanced users

*** Web interface

**** JavaScript

**** WebSocket

*** Mobile clients

**** port GNUnet to mobile devices

**** or client only approach

*** Extensibility

**** channel API
***** using a sandboxed QML or HTML view
***** JavaScript API
***** enables easy app development
***** access only channel data

**** client API
***** using libpsycclient
***** allows for developing full-fledged clients

* Future work

** Future work

*** Future work

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#+LaTeX: \textbf{\Huge{Future work}}
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*** Future work

**** routing layer - multicast

**** separate user and node identities

**** user interface 

***** improvements on desktop

***** implement web UI

***** implement mobile UI

**** file transfers