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By the way, what’s the status of ristretto255? The latest version of the internet-draft [0] expired a while ago.

[0] https://datatracker.ietf.org/doc/draft-hdevalence-cfrg-ristr...

From what I can tell, they were trying to get it adopted as RFC, but then a couple more things popped up on the CFRG, so they're planning a new version[1]. It's been adopted by the CFRG officially[2]. I haven't seen any sign of when the next version may be out (which will be draft-irtf-cfrg-ristretto-00[3]), however.

I kind of hope they'll also add ristretto448 since RFC 7748 and 8032 include X448/Ed448, so that the draft has feature parity (and covers the h = 4 case properly).

[1] https://mailarchive.ietf.org/arch/msg/cfrg/3RRpX9hME5ErtAzCo...

[2] https://mailarchive.ietf.org/arch/msg/cfrg/wd8pprUfJoNhvEQE0...

[3] https://mailarchive.ietf.org/arch/msg/cfrg/pT2ML68BapPAcUiSk...

We've just finished our own updates to the draft, and are currently getting some feedback on it off-list before we publish the next version.

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