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Andrew Fregly writes:
> Merkle Tree Ladder mode of operation for DNSSEC in =E2=80=9Cbatch=E2=80=
=9D mode could also
> reduce the number of signing operations for SPHINCS+ to the point where a
> parameter set for 2^20 signatures would likely be viable as this would
> support ladder updates on one-second intervals for DNS zones that do a zo=
ne
> signing key rollover every 10 days.

To help people evaluate the potential real-world impact of this MTL
example, can you please comment on whether MTL is patent-free?

---D. J. Bernstein (speaking for myself)

P.S. I asked "Is MTL patent-free?" at the Fourth PQC Standardization
Conference. The answer at that time was "We=E2=80=99re just presenting the
research today and will answer other questions if and as we promote MTL
mode as a candidate for standardization."

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