Re: New Technology to Make Digital Data Disappear, on Purpose
a good article about the technology and its implications: http://www.physorg.com/news173556803.html [Moderator's note: old news (we already had announcements on Vanish here weeks ago), but in the last few days Ed Felten announced attacks on Vanish: http://www.freedom-to-tinker.com/blog/felten/breaking-vanish-story-security-research-action so I thought I'd let this through as a way of mentioning that... --Perry] saqib http://replaycall.com - The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to majord...@metzdowd.com
Re: New Technology to Make Digital Data Disappear, on Purpose
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
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
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
Re: New Technology to Make Digital Data Disappear, on Purpose
> 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
