Upgrading SSH Keys

openssh
openssh

A guide to creating SSH keys

Required Commands

I used to frequently reference this before moving to SSH certificates. Still a useful reference when creating keys. For more details, see Gerts blog post linked below.

Create new ed25519 keys:

ssh-keygen -o -a 100 -t ed25519

Create secure rsa keys:

ssh-keygen -t rsa -b 4096 -o -a 100

Find all keys on your system:

for keyfile in ~/.ssh/*.pub; do ssh-keygen -l -f "${keyfile}"; done | uniq

Change or add passphrase to existing keys:

ssh-keygen -f ~/.ssh/id_rsa -p -o -a 100

Start ssh agent on headless server:

exec ssh-agent bash

upgrade-your-ssh-keys

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