This read-write field, when enabled, causes incoming SSH connections to be authenticated with public-key authentication first, using the authorized-users key table, before falling back to the router's standard AAA. Admins care because enabling stronger key-based authentication alongside or instead of passwords significantly raises the bar against credential-guessing attacks. For example, an admin enables this so administrators with a registered public key can log in without a password prompt, while accounts lacking a key still fall through to standard AAA authentication.