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docs: Mention NTRU-Prime/Curve25519 kex.

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Jacob Nevins
2022-09-10 20:55:00 +01:00
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@ -2347,6 +2347,13 @@ cipher selection (see \k{config-ssh-encryption}).
PuTTY currently supports the following key exchange methods:
\b \q{NTRU Prime / Curve25519 hybrid}: NTRU Prime is a lattice-based
algorithm intended to resist quantum attacks. In this key exchange
method, it is run in parallel with a conventional Curve25519-based
method (one of those included in \q{ECDH}), in such a way that it
should be no \e{less} secure than that commonly-used method, and
hopefully also resistant to a new class of attacks.
\b \q{ECDH}: \i{elliptic curve} \i{Diffie-Hellman key exchange},
with a variety of standard curves and hash algorithms.