Re: [Cfrg] Comments on draft-hoffman-c2pq-01
"Paul Hoffman" <paul.hoffman@vpnc.org> Fri, 21 July 2017 16:27 UTC
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From: Paul Hoffman <paul.hoffman@vpnc.org>
To: Philip Lafrance <philip.lafrance92@gmail.com>
Cc: cfrg@irtf.org
Date: Fri, 21 Jul 2017 18:26:56 +0200
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Subject: Re: [Cfrg] Comments on draft-hoffman-c2pq-01
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On 21 Jul 2017, at 14:01, Philip Lafrance wrote: > So I can't express enough how much I support this document. Thanks! > Comments: > > Section 1.3 > > -The definition given for “post-quantum cryptography” > is pretty > limited and kind of inaccurate. The definition as given would suggest > that > ECC is post-quantum as it does not rely on factoring large numbers or > determine the discrete log of a large composite number. > > > Maybe something like: > > > "The term "post-quantum cryptography" refers to the invention and > study of > cryptographic techniques (including encryption, signature and key > exchange > algorithms) that are implementable on a classical computer and are > based on > problems that are believed to be difficult for a quantum computer to > solve. > In particular, this includes algorithms based on lattices, isogenies, > hash-functions, multivariate polynomial systems, and coding theory. It > excludes systems whose security relies on factoring numbers, or the > difficulty of determining the discrete log of one group element with > respect to another." Yes, great. > Section 1.6 > > -The good folks at the Institute for Quantum Computing > have a > good textbook which would be a nice reference (here is a link > http://hep.fcfm.buap.mx/cursos/2014/MCI/An_Intro_to_Quantum.pdf) That book is more limited (and, to my eye, harder to read) than the more popular Nielsen and Chuang. (Side-note: posting URLs to ripped copies of books is a bit tacky...) > Section 2.1 > > -This section seems to only be concerned with using > quantum > algorithms to recover secret key. Why not also mention for example > using > Grover to find collisions to forge signatures? Finding collisions in greater than 2^128 quantum steps doesn't seem like an interesting threat (assuming that you are using a hash like SHA256 or better). > -We should maybe consider replacing “large-scale” > quantum > computer with “universal” quantum computer. I definitely need to work on the terminology here. I'll send out separate messages after I have incorporated some other off-list suggestions in this area that I have received. > -Maybe some discussion about the differences between quantum annealing > and > a universal quantum computer. This would be useful because, for > example > D-Wave is a quantum annealer, not a universal quantum computer, but > the > difference is lost on most people. Understanding the difference is > important if we’re talking about when to transition. This sounds great. Suggestions of text are welcome! --Paul Hoffman
- [Cfrg] Comments on draft-hoffman-c2pq-01 Philip Lafrance
- Re: [Cfrg] Comments on draft-hoffman-c2pq-01 Paul Hoffman