I wrote:
> It's not that anyone has quoted an official
> NSA document prohibiting non-hybrid PQ.

Sorry, that should say "It's not that anyone has quoted an official NSA
document prohibiting hybrid PQ." Too many negations. :-)

At some point on the list there was a deceptive quote "Do not use a
hybrid or other non-standardized QR solution on NSS mission systems
except for those exceptions NSA specifically recommends to meet
standardization or interoperability requirements". To see that this is
not a hybrid prohibition, simply look at the preceding sentence of

    
https://media.defense.gov/2022/Sep/07/2003071836/-1/-1/0/CSI_CNSA_2.0_FAQ_.PDF

stating in boldface "Should one use a hybrid or other non-standardized
QR solution while waiting for a final NIST post-quantum standard?", and
observe that we're no longer in the "waiting" situation.

---D. J. Bernstein

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