Are my private keys at risk?
Userify only needs the SSH public key/certificate. Your servers don't need it to authenticate you either. This has traditionally been one of the hardest things to explain about public-key cryptography: there is no shared secret like a password or a private key. Your public key is enough to securely log you in to a server, but you can still freely share your public key or publish it on your website. .
With Userify, you don't have to share your private key with us or anyone else. (Try to avoid sharing private keys. If you use 'keypair' services, you are usually sacrificing security for convenience.)
Rotating or updating your private key is much easier to deal with than ever before. Instantly rotate your keys without dealing with production pushes from configuration management or IT involvement. Just paste your new public key into Userify and it will be deployed in seconds.