The old files are renamed with '.old' extension. The created host key has relatively little randomness in it. We will have to actually create more randomness in it to have strong keys. This can be done later. Configure sshd2 Set up ssh2 configuration files.
Public keys have a .pub suffix, private keys have none.
Lists the private keys that can be used for authentication. Lists the public keys that are accepted for authentication on this host. See man page for details. Client configuration file.