A system for online configuration and communication for a supervisory control and data acquisition system comprising an online configurable enterprise server, at least one intelligent electronic device, an online configurable intelligent electronic cryptographic module, and a configurable server interface. Both the online configurable enterprise server and the online configurable intelligent electronic cryptographic module include respective cryptography chips and computer instructions for instructing respective processors to selectively encrypt and decrypt commands, messages, data, and responses, allowing non-encrypted transmissions between the at least one intelligent electronic device and the online configurable intelligent electronic cryptographic module, and selectively encrypted transmission between the intelligent electronic cryptographic module and the online configurable enterprise server.