Re: [Cfrg] Interest in an "Ed25519-HD" standard?

Phillip Hallam-Baker <phill@hallambaker.com> Wed, 22 March 2017 00:35 UTC

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From: Phillip Hallam-Baker <phill@hallambaker.com>
Date: Tue, 21 Mar 2017 20:34:58 -0400
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To: Tony Arcieri <bascule@gmail.com>
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Subject: Re: [Cfrg] Interest in an "Ed25519-HD" standard?
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I have just implemented Proxy Re-Encryption under Ed-25519 and Ed448. I
think EdCurve Crypto is a good plan.

Or we could do it on the Montgomery Curves and give the algorithm for point
addition.

On Tue, Mar 21, 2017 at 3:42 PM, Tony Arcieri <bascule@gmail.com> wrote:

> Hierarchical key derivation (also sometimes described as "semiprivate
> keys" or "key blinding") is an increasingly popular technique for
> generating unlinkable child keys from master public and private keys.
>
> The Tor Project has been exploring such an approach as the basis for their
> next-generation hidden services design for several years now[1], during
> which time it has received security proofs[2]. Their latest design[3]
> allegedly includes feedback from Dan Bernstein.
>
> Application of hierarchical key derivation is perhaps most notable in the
> cryptocurrency space, where Bitcoin's BIP32[4] provided a means for
> unlinkable single-use signature keys for the secp256k1 elliptic curve.
> There are several designs for applying the ideas from BIP32 to Ed25519,
> including ones from Evernym[5] and Chain[6] (where I am an employee).
>
> The designs in [3], [5], and [6] are all highly similar and accomplish the
> same goals. Personally I would love to see a single standard design for
> producing Ed25519 signatures from hierarchically derived keys, notably one
> which produces signatures that can be verified by any off-the-shelf RFC
> 8032-compatible Ed25519 implementation.
>
> There's already been some discussion of this on the moderncrypto.org
> curves list:
>
> https://moderncrypto.org/mail-archive/curves/2017/000858.html
>
> I'd be curious to know if anyone else would be interested in collaborating
> on a draft for such a standard, which can be a synthesis of the existing
> work in this space.
>
> [1]: https://lists.torproject.org/pipermail/tor-dev/2012-
> September/004026.html
> [2]: https://www-users.cs.umn.edu/~hopper/basic-proof.pdf
> [3]: https://gitweb.torproject.org/torspec.git/
> tree/proposals/224-rend-spec-ng.txt#n1979
> [4]: https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
> [5]: https://github.com/WebOfTrustInfo/rebooting-the-
> web-of-trust-fall2016/blob/master/topics-and-advance-
> readings/HDKeys-Ed25519.pdf
> [6]: https://chain.com/docs/protocol/specifications/chainkd
>
> --
> Tony Arcieri
>
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