Re: New Technology to Make Digital Data Disappear, on Purpose

2009-07-29 Thread Ali, Saqib
Online demo of Vanish:
http://regina.cs.washington.edu/cgi-bin/vanishservice.py



saqib
http://kawphi.blogspot.com

-
The Cryptography Mailing List
Unsubscribe by sending unsubscribe cryptography to majord...@metzdowd.com


Re: New Technology to Make Digital Data Disappear, on Purpose

2009-07-23 Thread Jerry Leichter

On Jul 21, 2009, at 10:48 PM, Perry E. Metzger wrote:


d...@geer.org writes:
The pieces of the key, small numbers, tend to =93erode=94 over  
time as
they gradually fall out of use. To make keys erode, or timeout,  
Vanish

takes advantage of the structure of a peer-to-peer file system. Such
networks are based on millions of personal computers whose Internet
addresses change as they come and go from the network.


One would imagine that as IPv6 rolls out, the need
for DHCP goes to zero excepting for mobile devices
attaching to public (not carrier) nets.  Yes?


Off topic, but actually DHCP is still needed. A machine needs to
configure a lot more than just its address and router in common cases
(it wants things like DNS servers, NTP servers, etc.) and in large
deployments, it is often far easier to let machines autoconfigure  
these

things during boot using DHCP even on comparatively hard wired
networks.

And with that, lets return to crypto...
The proposal makes use of an incidental property of existing DHT  
implementations:  Because many nodes are running on machines with  
dynamic IP addresses, rehashes - which cause the table to change and  
this leads to the loss of bits.  It's not actually clear from the  
paper how much of the bit loss is actually due to IP address changes  
and how much to other phenomena.  In any case, if this idea catches on  
and there isn't enough noise in the network naturally to give an  
adequate bit drop rate, it would be reasonable to add an explicit bit- 
dropping mechanism to some new release.  You'd need one to add IPv6  
support anyway!

-- Jerry

-
The Cryptography Mailing List
Unsubscribe by sending unsubscribe cryptography to majord...@metzdowd.com


Re: New Technology to Make Digital Data Disappear, on Purpose

2009-07-22 Thread Perry E. Metzger

d...@geer.org writes:
   The pieces of the key, small numbers, tend to =93erode=94 over time as
   they gradually fall out of use. To make keys erode, or timeout, Vanish
   takes advantage of the structure of a peer-to-peer file system. Such
   networks are based on millions of personal computers whose Internet
   addresses change as they come and go from the network.

 One would imagine that as IPv6 rolls out, the need
 for DHCP goes to zero excepting for mobile devices
 attaching to public (not carrier) nets.  Yes?

Off topic, but actually DHCP is still needed. A machine needs to
configure a lot more than just its address and router in common cases
(it wants things like DNS servers, NTP servers, etc.) and in large
deployments, it is often far easier to let machines autoconfigure these
things during boot using DHCP even on comparatively hard wired
networks.

And with that, lets return to crypto...

Perry

-
The Cryptography Mailing List
Unsubscribe by sending unsubscribe cryptography to majord...@metzdowd.com


New Technology to Make Digital Data Disappear, on Purpose

2009-07-21 Thread Ali, Saqib
The researchers said they had struck upon a unique approach that
relies on “shattering” an encryption key that is held by neither party
in an e-mail exchange but is widely scattered across a peer-to-peer
file sharing system.

The pieces of the key, small numbers, tend to “erode” over time as
they gradually fall out of use. To make keys erode, or timeout, Vanish
takes advantage of the structure of a peer-to-peer file system. Such
networks are based on millions of personal computers whose Internet
addresses change as they come and go from the network. This would make
it exceedingly difficult for an eavesdropper or spy to reassemble the
pieces of the key because the key is never held in a single location.
The Vanish technology is applicable to more than just e-mail or other
electronic messages

Read more:
http://www.nytimes.com/2009/07/21/science/21crypto.html



Saqib
http://kawphi.blogspot.com

-
The Cryptography Mailing List
Unsubscribe by sending unsubscribe cryptography to majord...@metzdowd.com


Re: New Technology to Make Digital Data Disappear, on Purpose

2009-07-21 Thread dan

  The pieces of the key, small numbers, tend to =93erode=94 over time as
  they gradually fall out of use. To make keys erode, or timeout, Vanish
  takes advantage of the structure of a peer-to-peer file system. Such
  networks are based on millions of personal computers whose Internet
  addresses change as they come and go from the network.


One would imagine that as IPv6 rolls out, the need
for DHCP goes to zero excepting for mobile devices
attaching to public (not carrier) nets.  Yes?

--dan

-
The Cryptography Mailing List
Unsubscribe by sending unsubscribe cryptography to majord...@metzdowd.com