A data processing system having a host computer including a key manager, a control unit connected to the host computer, a data storage unit controlled by the control unit, and data storage medium for storing data thereon to be written to or read from by the data storage unit. The method includes: a) a joining edge of the first cellular core structure is joined to a corresponding joining edge of the second cellular core structure, thereby forming the junction area; b) the first cellular core structure and the second cellular core structure are placed between an inner skin and an outer skin of the panel. A protrusion extends from a first surface of the flapper. The top level is a communication protocol that directs the synchronization process such that minimization of bits communicated, rounds of communication, and local computation are simultaneously addressed.