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[TLS] Re: Working Group Last Call for Use of ML-DSA in TLS 1.3

Watson Ladd <watsonbladd@gmail.com> Mon, 13 April 2026 22:20 UTC

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From: Watson Ladd <watsonbladd@gmail.com>
Date: Mon, 13 Apr 2026 15:20:29 -0700
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To: David Benjamin <davidben@chromium.org>
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Subject: [TLS] Re: Working Group Last Call for Use of ML-DSA in TLS 1.3
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I do not think composite certs make sense for TLS.

On Mon, Apr 13, 2026 at 12:33 PM David Benjamin <davidben@chromium.org> wrote:
>
> On Mon, Apr 13, 2026 at 10:51 AM Viktor Dukhovni <ietf-dane@dukhovni.org> wrote:
>>
>> On Mon, Apr 13, 2026 at 04:30:34PM +0000, Andrei Popov wrote:
>>
>> > Just to weigh in on this: I would support adoption of
>> > draft-reddy-tls-composite-mldsa. There is customer demand for
>> > composite certs, and I would like to get these implemented in the
>> > Windows TLS stack.
>>
>> I don't know what sort of interoperability you are expecting with these,
>> I am strongly inclined to NOT implement any of the composite signature
>> algorithms, at least not in TLS.  It may be harder to fend off their
>> adoption in CMS, but ideally sit that out as well, until we either have
>> CRQCs and hybrids are pointless, or we don't have CRQCs and know why
>> we're never going to have them.
>
>
> We're also not planning to implement composite ML-DSA in TLS.
>
> David
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