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Enterprise Resource Planning (ERP) is the technology that provides the unified business function to the organization by integrating the core processes. ERP now is experiencing the transformation that will make it highly integrated, more intelligent, more collaborative, web-enabled, and even wireless. The ERP system is becoming the system with high vulnerability and high confidentiality in which the security is critical for it to operate. Many ERP vendors have already integrated their security solution, which may work well internally; while in an open environment, we need new technical approaches to secure an ERP system. This paper introduces ERP technology from its evolution through architecture to its products. The security solution in ERP as well as directions for secure ERP systems is presented.