#+TITLE:     Introduction to SecuShare
#+AUTHOR:    Daniel Reusche and Gabor Toth
#+LANGUAGE:  en
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* Introduction
** Introduction
   [[file:./img/unicast.png]]
*** unicast 							   :NOEXPORT:
- natural communication  
  - this is where we want to go

** Introduction
   [[file:./img/cloud.png]]
*** server 							   :NOEXPORT:
- this is where we are now
  - servers
  - clouds
  - clusters
- all more or less centrally owned


* Goals
** Goals
#+Begin_Center
#+LaTeX: \textbf{\Huge{Transfer Anything}}
#+End_Center
*** Transfer 							   :NOEXPORT:
- Arbitrary stuff
  - messages
  - subscription lists, etc.
  - files
- future:
  - push to talk
  - television
   
** Goals
#+Begin_Center
#+LaTeX: \textbf{\Huge{Resilience}}
#+End_Center
*** Resilience 							   :NOEXPORT:
- Do not get rid of servers but:
  - Make nodes/content/servers easily exchangeable.
- It is no problem if a server goes down, because traffic is rerouted.
- If we put up another server, traffic gets quickly routed over it again.

** Goals 
#+Begin_Center
#+LaTeX: \textbf{\Huge{Privacy}}
#+End_Center
*** Privacy 							   :NOEXPORT:
- Only intended recipients get the content. 
- public stuff unencrypted
- Make sure of this by end-to-end encryption
- Groups and one-on-one chat
  - goal mpotr
    - encrypted
    - authenticated
    - repudiable
- maybe even anonymity later:
  - play with packet padding and timing
  - onion routing possible
    
** Goals
#+Begin_Center
#+LaTeX: \textbf{\Huge{Scalability}}
#+End_Center
*** Scalability 						   :NOEXPORT:
- not only adsl nodes
  - servers for routing, buffering
    - bandwith, cpu, memory
    - everything is encrypted, so no problem
- Round Robin slow
  - Carlos Mailverteiler
  - vor 5 jahren 70% XMPP traffic presence messages
  - http://about.psyc.eu/XMPP#Scalability
- multicast distribution trees scale well
  - psyc: several hundred instances of up to 10k users each

** Goals
   [[file:./img/multicast.png]]
*** notes 							   :NOEXPORT:
- this is what we want to do 
- make the first scale on large networks

** Goals
#+Begin_Center
#+LaTeX: \textbf{\Huge{API}}
#+End_Center
*** API 							   :NOEXPORT:
- Ease of use for developers = more applications
- we need gread (Easily adaptable) interfaces
  - our grandmothers have to be able to use it
- The developers will never be able to keep up with all the needs of the users
* How Not To Do It
** How Not To Do It
#+Begin_Center
#+LaTeX: \textbf{\Huge{Trust in Servers}}
#+End_Center
*** notes 							   :NOEXPORT:
- Can be seized 
- server unfriendly legislation can be passed, eg liability
- In current architectures, lots of data resides there
- federation:
  - data is visible, accessible on even more servers
  - you have to trust even more admins
- Central points of failure
  - even with crypto, the data is not lost but the communication channels are
- Servers are vulnerable to:
  - Memory analysis
- VPSs are vulnerable to :
  - Being fed bad random data -> weak crypto

** How Not To Do It
#+Begin_Center
#+LaTeX: \textbf{\Huge{Encryption in the Browser}}
#+End_Center
*** notes 							   :NOEXPORT:
- trust in integrity of whatever code you get from the server required
- server compromised, all users compromised 
- ssl ca system broken

* Technologies
** Technologies
#+Begin_Center
#+LaTeX: \textbf{\Huge{GNUnet}}
#+End_Center
*** GNUnet 							   :NOEXPORT:
- Use it for routing and encryption.
- anonymous filehosting
- TUM, in the heritage of freenet

** Technologies
#+Begin_Center
#+LaTeX: \textbf{\Huge{PSYC}}
#+End_Center
*** PSYC 							   :NOEXPORT:
- Use it for multicast binary transport and trust graph.
- Scales well, several hundred instances with 10k users each 

* About Us
** Contributors
- Carlo von lynX
- Gabor Toth
- Matthias Baumann
- Daniel Reusche
** URL
#+Begin_Center                        
#+LaTeX: \textbf{\Huge{secushare.org}}
#+End_Center