Re: [Cfrg] Elliptic Curve patents
Michael Scott <mike.scott@miracl.com> Fri, 07 October 2016 12:57 UTC
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From: Michael Scott <mike.scott@miracl.com>
Date: Fri, 07 Oct 2016 13:57:26 +0100
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To: Dan Brown <danibrown@blackberry.com>
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Cc: "cfrg@irtf.org" <cfrg@irtf.org>
Subject: Re: [Cfrg] Elliptic Curve patents
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Hello Dan, Here is another of Meyer's patents, that I think may cause a problem for a method of multiplicative masking recommended by yourself and others (Scott Fluhrer?) in the past, and commonly used for modular inversion in the context of ECDSA signature https://www.google.com/patents/US20080201398 Mike On Fri, Oct 7, 2016 at 1:32 PM, Dan Brown <danibrown@blackberry.com> wrote: > how are "strong" primes defined here? > > > *From: *Michael Scott > *Sent: *Friday, October 7, 2016 5:57 AM > *To: *cfrg@irtf.org > *Subject: *[Cfrg] Elliptic Curve patents > > I was just doing some checking on the status of patents as applicable to > Elliptic Curve Cryptography, and I came across the very impressive patent > portfolio of one Bernd Meyer. > > http://patents.justia.com/inventor/bernd-meyer?page=2 > > See for example this one.. > > Cryptographic method with elliptical curves > <http://patents.justia.com/patent/8582761> > Patent number: 8582761 > Abstract: A method determines an elliptical curve, suitable for a > cryptographic method. An elliptical curve to be tested is prepared. The > order of a twisted elliptical curve associated with the elliptical curve to > be tested is determined. It is automatically checked whether the order of > the twisted elliptical curve is a strong prime number. If the order of the > twisted elliptical curve is a strong prime number, the elliptical curve to > be tested is selected as an elliptical curve suitable for cryptographical > methods. > Type: Grant > Filed: March 6, 2007 > Date of Patent: November 12, 2013 > Assignee: Siemens Aktiengesellschaft > Inventors: Jean Georgiades, Anton Kargl, Bernd Meyer > > Now I know that no-one here is a lawyer. But I would read this as > suggesting that Siemens holds a patent on twist secure curves (like > GoldiLocks). > > Tell me it ain't so. And not just that, if you look at the full portfolio, > many other commonly used techniques for ECC are also covered. > > > Mike Scott > >
- [Cfrg] Elliptic Curve patents Michael Scott
- Re: [Cfrg] Elliptic Curve patents Kyle Rose
- Re: [Cfrg] Elliptic Curve patents Dan Brown
- Re: [Cfrg] Elliptic Curve patents Michael Scott
- Re: [Cfrg] Elliptic Curve patents Bodo Moeller
- Re: [Cfrg] Elliptic Curve patents D. J. Bernstein