A structure health monitoring system according to the invention can be deployed in an onboard environment, such as an aircraft, to provide an ongoing damage assessment of structural components on the aircraft. The circuit board device under test is loaded into an automated test apparatus, which includes a mechanism for automatically connecting test electronics to various DUT circuitry and IO ports via corresponding connectors on the DUT. The data transfer device also encrypts the transformed predetermined reference data using the encryption key or encrypts the predetermined reference data using the transformed encryption key, and then stores the encrypted content data and the encrypted transformedpredetermined reference data to the removable data storage item. Optimal values of rowlength and row height are chosen based upon the maximum chip area reduction. Execution of the locally unique form will fail to perform as intended unless the locally unique form is first or concurrently transformed, using the diversity mechanism, into the executable form having correct semantics.