Abstract: A system for providing protected two-way communication between a shared control database (“base station”) and at least one remotely located protector module/remote unit uses a two-way pager system in conjunction with a communications host and a security algorithm. The security algorithm has the capability of producing a time-varying password, say every sixty seconds, and can be made part of a microprocessor housed in the protector module. Each protector module has a unique inherently assigned identification number (ID) which is verified and authenticated by the control database each time a message is received from the remotely located associated protector module. In addition, the system makes sure that each communication between the control database and a remote unit has a component which matches a predetermined electronic identification number (EIN).