By default SSH leaks all of the below public keys (if they exist) + all public keys in your ssh-agent to a server you connect to.

  ~/.ssh/id_ecdsa.pub
  ~/.ssh/id_ecdsa_sk.pub
  ~/.ssh/id_ed25519.pub
  ~/.ssh/id_ed25519_sk.pub
  ~/.ssh/id_xmss.pub
  ~/.ssh/id_dsa.pub

running `ssh late.sh` would do exactly that.

At the very bottom of the website they give you a command that would not leak your public keys.

`ssh-keygen -t ed25519 -f ~/.ssh/late_throwaway && ssh -o IdentitiesOnly=yes -i ~/.ssh/late_throwaway late.sh`

this would only send the late_throwaway public key