well, you sort of can, in multiples of 8 hours.<br><br>The vuse network purges the hashes after the 8 hour limit has been reached, and they have implemented a refresh module into vanish to re-up the hashes.<br><br>still, it relies on p2p networks, and all of your hash may not be available.<br>
<br><div class="gmail_quote">On Fri, Aug 14, 2009 at 11:49 AM, Robert Ladyman <span dir="ltr"><<a href="mailto:it@file-away.co.uk">it@file-away.co.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
Yes, it would be better to be able to set an expiry date, or decay rate, or<br>
somesuch<br>
<div class="im"><br>
> it's an awesome concept, but for one flaw in my opinion.<br>
><br>
><br>
> "Instead, we leverage an unusual storage media in a novel way: namely,<br>
> global-scale peer-to-peer networks. Vanish creates a secret key to encrypt<br>
> a user's data item (such as an email), breaks the key into many pieces and<br>
> then sprinkles the pieces across the P2P network. As machines constantly<br>
> join and leave the P2P network, the pieces of the key gradually disappear.<br>
> By the time the hacker or someone with a subpoena actually tries to obtain<br>
> access to the message, the pieces of the key will have permanently<br>
> disappeared.<br>
><br>
> Our Vanish prototype uses the Vuze<br>
</div>> Bittorrent<<a href="http://azureus.sourceforge.net/index.php" target="_blank">http://azureus.sourceforge.net/index.php</a>>Distributed Hash<br>
<div class="im">> Table as the underlying P2P network. Our prototype by<br>
> default supports data timeouts of 8--9<br>
</div>> hours<<a href="http://vanish.cs.washington.edu/faq.html#How_much_flexibility" target="_blank">http://vanish.cs.washington.edu/faq.html#How_much_flexibility</a>>,<br>
<div class="im">> though longer timeouts are possible. "<br>
><br>
><br>
><br>
> This seems a very unreliable method of timing the key destruction. Also<br>
> what happens if you can only obtain 50% of the key?<br>
><br>
><br>
> It's clever, but there's still work to be done.<br>
><br>
> On Fri, Aug 14, 2009 at 1:06 AM, Rick Moynihan<br>
<<a href="mailto:rick.moynihan@gmail.com">rick.moynihan@gmail.com</a>>wrote:<br>
> > 2009/8/13 Robert Ladyman <<a href="mailto:it@file-away.co.uk">it@file-away.co.uk</a>>:<br>
> > > Interesting approach.<br>
> > ><br>
> > > <a href="http://news.bbc.co.uk/1/hi/technology/8197449.stm" target="_blank">http://news.bbc.co.uk/1/hi/technology/8197449.stm</a><br>
> ><br>
> > It's pretty awesome isn't it? I ran into it sometime last week.<br>
> ><br>
> > Not sure how practical it is, but you can find more details on<br>
> > achieving the previously impossible here:<br>
> ><br>
> > <a href="http://vanish.cs.washington.edu/" target="_blank">http://vanish.cs.washington.edu/</a><br>
> ><br>
> > R.<br>
> ><br>
> > _______________________________________________<br>
> > dundee GNU/Linux Users Group mailing list<br>
> > <a href="mailto:dundee@lists.lug.org.uk">dundee@lists.lug.org.uk</a> <a href="http://dundeelug.org.uk" target="_blank">http://dundeelug.org.uk</a><br>
> > <a href="https://mailman.lug.org.uk/mailman/listinfo/dundee" target="_blank">https://mailman.lug.org.uk/mailman/listinfo/dundee</a><br>
> > Chat on IRC, #tlug on <a href="http://irc.lug.org.uk" target="_blank">irc.lug.org.uk</a><br>
<br>
--<br>
<br>
</div><div class="im">Robert Ladyman<br>
File-Away Limited, 32 Church Street, Newtyle<br>
Perthshire, PH12 8TZ SCOTLAND<br>
Registered in Scotland, Company Number SC222086<br>
Tel: +44 (0) 1828 898 158<br>
Mobile: +44 (0) 7732 771 649<br>
<a href="http://www.file-away.co.uk" target="_blank">http://www.file-away.co.uk</a><br>
<br>
<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br><br><br>Nick Walker<br>Vice President : The Linux Society<br>UAD Ethical Hacker<br>