How to Get a Public Key onto Nexus

Use a machine that already has SSH access to Nexus (Atlas or the Mac laptop) as a relay.

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Step 1: Generate a Key on the New Machine

ssh-keygen -t ed25519

Accept the default file location (~/.ssh/id_ed25519) and optionally set a passphrase.

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Step 2: Transfer the Public Key to a Trusted Machine

Email or copy ~/.ssh/id_ed25519.pub to a machine that already has SSH access to Nexus.

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Step 3: Copy the Public Key to Nexus

From the trusted machine:

scp ~/id_ed25519.pub matt@192.168.1.226:~

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Step 4: Add the Key to authorized_keys

SSH into Nexus from the trusted machine, then append the key and clean up:

ssh matt@192.168.1.226
cat ~/id_ed25519.pub >> ~/.ssh/authorized_keys
rm ~/id_ed25519.pub

The new machine can now SSH directly into Nexus.