The key can contain numbers, letters, or symbols like the one above. On remote Unix, Linux, or macOS machines the public key needs to be placed into a file called ~/.ssh/authorized_keys file using a ...

Replace the public key in ~/.ssh/authorized_keys on your existing instance so the attacker can no longer unlock it with their private key. Here’s a summary of how to replace the keys mentioned ...

It affects only keys using the RSA cryptographic algorithm, which the researchers found in roughly a third of the SSH signatures they examined.