Now is probably the time to publish in internet-draft form:

On Fri, Feb 23, 2018 at 12:48 PM, Roland Bracewell Shoemaker
<> wrote:
> Hey all,
> After the issues with the SNI based TLS challenges were discovered there was 
> interest from a number of parties in developing another challenge that did 
> validation at the TLS layer. After some discussion about possibilities we’ve 
> come up with a new challenge type based on ALPN which we believe provides the 
> required security properties which the SNI based methods did not have.
> I’ve attached the rough draft of a document which defines this new method and 
> lays out the security considerations and design rationale for it. Given the 
> interest in getting a new TLS method specified would the WG chairs be 
> amenable to directly adopting this as a WG work product (assuming there is 
> consensus on list) so that we can start work on it or is it required to be 
> submitted as a individual draft first?
> Happy to field any questions about the details. I’d also like to thank 
> everyone who provided initial input and editorial opinions on this.
> Thanks,
> Roland
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