The SSH server also supports a public key authentication as long as the server has been previously configured to know the client's public key.
Using Public Key authentication (also known as Public Key Infrastructure - PKI) can be more secure than the existing username and password method because of the following reasons.
A user typically re-uses the same password with multiple servers. If the password is compromised, the user must reconfigure the password on all affected servers.
A password is not transmitted between the client and server using PKI. Instead the sensitive information (the private key) is kept on the client. Therefore the password is less likely to be compromised.
SR OS supports server-sider SSHv2 public key authentication but does not include a key-generation utility.
Support for PKI should be configured in the system-level configuration where one or more public keys may be bound to a username. This configuration does not affect any other system security or login functions.
PKI has preference over password or keyboard authentication. PKI is supported using local authentication and using an AAA server with LDAP only. PKI authentication is not supported on TACACS+ or RADIUS, and users with public keys always use local authentication only.