ed25519, rsa ref done

_ref/ed25519/main.adoc

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+
+=== ED25519
+
+ED25519footnote:[https://datatracker.ietf.org/doc/html/rfc8709] is a relatively somewhat new OpenSSH key algorithm. It has numerous benefits over e.g. RSA, including:
+
+* fixed key sizes, so fixed pubkey sizes
+** and significantly shorter pubkeys, yet-
+* strength comparable to RSA4096, but-
+** much faster
+* public domain and https://ed25519.cr.yp.to/[developed by independent researchers^]; not tied to specific corporation (i.e. nothing like https://en.wikipedia.org/wiki/RSA_Security[RSA^])
+
+I recommend it over all other key types for new SSH keys as long as it's supported by clients/servers.
+
+include::public.adoc[]
+include::private/main.adoc[]