[Noisebridge-discuss] Secheduling a Cryptography Talk at Noisebridge on 4 August
Peter Schwabe
peter at cryptojedi.org
Mon Jul 25 06:36:34 UTC 2016
John Shutt <john.d.shutt at gmail.com> wrote:
> Yep, a short abstract would be good. Thanks!
Dear John, dear all,
Sorry for the late response, how about this one:
Title: Post-quantum crypto
Abstract: In 2012, Mark Ketchen, researcher at IBM, stated about large
quantum computers that they are "within reach" and estimated
a timespan of 10 to 15 years until such computers can be
built. It is not clear if Ketchen is right with this estimate,
it is not even clear if a large quantum computer will ever be
built. However, what is clear is that such a computer will be
able to break all asymmetric cryptography in wide use today.
More specifically, it will break in polynomial time systems
that are based on factoring (like RSA) and systems based on
the discrete logarithm (like DSA, and Diffie-Hellman key
exchange), including their elliptic-curve variants.
There are asymmetric cryptographic systems that, as far as we
know, are not broken by quantum computers, so called
"post-quantum cryptography". It is obvious that once large
quantum computers exist, the world will need to switch to such
post-quantum schemes. However, users who are concerned about
long-term security, have to switch to post-quantum schemes for
confidentiality already now: an attacker who records and
stores key exchanges today can go back in a decade or two and
use a quantum computer to attack them.
In my talk I will give a brief overview of post-quantum crypto
and then highlight what we can, and should, already do today
to provide long-term security in cryptographic systems. In
particular, I will present the "NewHope" key exchange, which
is currently used in an experiment by Google and is one of the
candidates to be considered for post-quantum key exchange in
Tor.
Cheers,
Peter
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