[cryptography] NIST Randomness Beacon

Natanael natanael.l at gmail.com
Mon Nov 11 18:37:54 EST 2013

You can also submit a hash of the documents of the event to the Bitcoin
blockchain in a transaction. There are so many who can confirm it was
published at a certain date that it can't be practically faked.

- Sent from my phone
Den 12 nov 2013 00:30 skrev "Peter Gutmann" <pgut001 at cs.auckland.ac.nz>:

> Warren Kumari <warren at kumari.net> writes:
> >I've often wondered if there is a clever way to do the inverse --
> basically
> >to have a "latest" timestamp? This seems like a much harder problem -- 'm
> >looking for a "movie plot" type solution that the public can easily
> >understand…
> You could do it with a physical one-way function.  Take a photo of the
> victim
> on top of the WTC and you know that it can't have been occurred after
> 9/11. To
> generalise it, photograph the victim in front of some documented object and
> then destroy the object.  I'm assuming in the movie-plot scenario that
> someone
> who's kidnapped a victim won't worry about blowing up a statue in a park or
> performing whatever the physical one-way operation is.  Depending on how
> evil
> your movie-plot villain is (and how convoluted the plot will get), he/she
> could kill random strangers after photographing them with the victim, in
> order
> to fix a point in time.
> Peter.
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