Re: [Cfrg] Adoption request: draft-hdevalence-cfrg-ristretto
"Filippo Valsorda" <filippo@ml.filippo.io> Wed, 24 July 2019 10:24 UTC
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Date: Wed, 24 Jul 2019 12:24:52 +0200
From: Filippo Valsorda <filippo@ml.filippo.io>
To: cfrg@irtf.org
Cc: draft-hdevalence-cfrg-ristretto@ietf.org
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Subject: Re: [Cfrg] Adoption request: draft-hdevalence-cfrg-ristretto
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What are the next steps in discussing adoption of this draft? I believe it would be especially timely, as ristretto255 provides a better prime-order group than Curve25519 for OPRFs and PAKEs that are being discussed by this group. Moreover, Cas Cremers and Dennis Jackson recently published a new round of small subgroup attacks that would have been avoided by Ristretto adoption, as they mention in the paper. https://eprint.iacr.org/2019/526.pdf 2019-05-18 00:22 GMT+02:00 Filippo Valsorda <filippo@ml.filippo.io>: > Hello, > > I'd like to request for the group to adopt > draft-hdevalence-cfrg-ristretto for publication as an Informational RFC. > > https://datatracker.ietf.org/doc/draft-hdevalence-cfrg-ristretto/ > > Ristretto255 is a prime-order group designed by Henry de Valence, > based on Mike Hamburg's Decaf. It provides a safe, efficient, and > implementor-friendly abstraction for a prime-order group, enabling safer > and simpler design of higher-level protocols. Its order is the same as > the prime-order subgroup of Curve25519. > > Ristretto255 can easily be implemented on top of an existing Curve25519 > library, and the authors are providing multiple implementations in > different languages: curve25519-dalek in Rust, by Isis Lovecruft > and Henry de Valence; curve25519-elisabeth in Java, by Jack Grigg; > ristretto255 in Go (implemented clean-room from the spec), > by George Tankersley and myself; and ristretto-donna (forthcoming) in > C, by Isis Lovecruft. We are also aware of other implementations we > have not personally tested for interoperability, including one in Frank > Denis's libsodium. > > https://github.com/dalek-cryptography/curve25519-dalek > https://github.com/cryptography-cafe/curve25519-elisabeth > https://github.com/gtank/ristretto255 > > Importantly, ristretto255 is a flexible abstraction, and can be > implemented with different, more efficient curves than Curve25519. The > draft only provides implementation details for a Curve25519 backend, > but it defines the interface contract which is required of compliant > implementations, allowing alternate backends. > > The group has already been adopted by some higher level protocols, > including Bulletproofs by Chain, and has been subject of discussion on > this list, including some good posts by Tony Arcieri. More information > is available at https://ristretto.group and in the draft, and the > authors and I are available to answer questions. > > Best, Filippo >
- [Cfrg] Adoption request: draft-hdevalence-cfrg-ri… Filippo Valsorda
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Jeff Burdges
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Filippo Valsorda
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Paterson Kenneth
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Jeff Burdges
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Riad S. Wahby
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Jack Grigg
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Jeff Burdges
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Riad S. Wahby
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Riad S. Wahby
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Filippo Valsorda
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Filippo Valsorda
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Riad S. Wahby
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Riad S. Wahby
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Filippo Valsorda
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Filippo Valsorda
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Riad S. Wahby
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Watson Ladd
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Riad S. Wahby
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Riad S. Wahby
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Henry de Valence
- [Cfrg] draft-hdevalence-cfrg-ristretto and draft-… Filippo Valsorda
- Re: [Cfrg] Adoption request: draft-hdevalence-cfr… Riad S. Wahby