Re: [Cfrg] Comb algorithm IPR status

[Alyssa Rowan <[e-mail]>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

On 06/03/2015 02:54, Benjamin Black wrote:
> There are only two possibilities: […] Which is it?

Ah, you misunderstood. Let me clarify my thought process for you:

• mLSB and SABS combs are different comb techniques.
  - mLSB is (I believe, based on advice given to me) patented.
  - SABS is (I believe, based on advice given to me) clear.

• The NUMS proposal used/referenced mLSB in ECCLib and the paper.
  - It didn't mention the mLSB patent, so we didn't know.
  - You claimed you didn't know either.

• You said ECClib passed MS's legal review for Apache2 licence release.
  - Apache2 [paraph.] (conditionally) grants for that Work/Contribution.
    · Anyone but MS releasing ECClib → trouble?
  - Apache2 is incompatible with, for example, GPLv2 (e.g. Linux!)
    · Anyone reusing ECClib's mLSB design, but not ECClib? → trouble?
  - We didn't know about the patent, so that could have been disastrous.
    · I don't want any trouble. [insert Jackie Chan meme here]

• However, thanks to Mike (& Robert etc), we know about it now.
  - Curve25519 reference implementation & draft doesn't use combs.
  - And Ed448-Goldilocks reference implementation uses SABS combs.
  - So, we no longer have a problem. I consider it a closed issue.

I hope that clears things up and we can move on.

- -- 
/akr
-----BEGIN PGP SIGNATURE-----
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=4KTO
-----END PGP SIGNATURE-----