Security is built into BigBusiness with all connections encrypted using state of the art protocols and all of the controls you might want if you want to review security setup.
BigBusiness automatically encrypts all connections. There is nothing you need to do to secure all Clients other than assign Passwords. This chapter provides more details.
As needed, you may secure passwords, allow only known IP addresses, and so forth that strengthen your security, and you may add various security softwares or services.