[Info-vax] SSH to Linux using Public Keys

[issinoho]

I'm trying to SSH from my Alpha to a Linux box in AWS using public keys.

My client system:
HP TCP/IP Services for OpenVMS Alpha Version V5.7 - ECO 5
SSH Secure Shell OpenVMS (V5.5) 3.2.0 on AlphaServer 400 4/166 - VMS V8.4-2L1

The server:
CentOS Linux release 8.3.2011
OpenSSH_8.0p1, OpenSSL 1.1.1g FIPS  21 Apr 2020

Firstly, should this be possible?

And, if so, does anyone have a definitive guide on getting it working?

The closest I have found is Raymii's page but that fails with unknown -o options.

All help happily accepted. TIA.