# ssh-keys > Public SSH keys assigned to users; the keys authenticate those users' incoming SSH logins. When a user has at least one key assigned, the SSH server refuses password authentication for that user and offers only... ----------- ## user/ssh-keys **Type:** Directory Public SSH keys assigned to users; the keys authenticate those users' incoming SSH logins. When a user has at least one key assigned, the SSH server refuses password authentication for that user and offers only public-key authentication. See [User](../../../authentication-authorization-accounting/user) for the full guide. System user the key is assigned to. Free-text label for the key. When adding a key with `key`, a trailing comment in the pasted OpenSSH key string becomes the key's `info` and overrides this parameter. Public key string, set only when adding a new key. Only the OpenSSH single-line format is accepted; PEM blocks are rejected. Type of the key: `rsa`, `ed25519` or `ed25519-sk`. Key length in bits. SHA256 fingerprint of the key in base64 (for example `SHA256:...`).