[ExI] The second step towards immortality

[Martin Sustrik]

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On 04/01/14 00:35, Anders Sandberg wrote:

> Exactly. Peter Eckersly and me have been looking at computer
> security for uploaded minds, and it is a worrying problem. If you
> can be edited or copied you are in deep trouble. If homeomorphic
> encryption can be made effective enough to keep uploads running,
> the future looks much brighter.

I would say copying is not much of a problem. Copied mind would work
in the same way as the original mind. The two can even synchronise via
a global resource such as Bitcoin blockchain: i.e. if payment is about
to be made, the program checks whether the transfer already took place
and if so, it skips the payment.

> It is hard to tell whether homeomorphic encryption is easy or hard
> to do. Current methods have fairly heavy slowdown factors (see 
> http://www.ijetae.com/files/Conference_ICMTSET_2013/IJETAE_ICMTSET_08.pdf
> ) but they look polynomial. If they can be quantum parallelized
> things would be awesome (there, you can also protect data by having
> it decay if anybody looks at it - intermediate states might be
> information-less). Even if it is all classical it wouldn't surprise
> me if cleverness might make it efficient... I would be more
> surprised (but still not very) if there was some kind of bound
> saying that a L level gate network *requires* something like L^3
> operations , since 3 is a weird arbitrary number. But intuition and
> computational complexity doesn't mix.

We'll see. It's not that long ago that it looked like the fully
homomorphic encryption may not even be possible.

Martin
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