In an embodiment, an electronic data security system improves the security and usability of encrypted electronic data using a symmetric key approach implemented by security engines embedded on operably coupled integrated circuits. Engines paired to integrated circuits in combinations of hardware and software engines implementing security tasks can also be utilized. A first security engine is configured to interface to a second security engine and, using the components of the respective security engines, securely exchange electronic data using symmetric key encryption. The key change instruction configures the second security engine private key for a subsequent transmission.