SOA is becoming important for Business Process Management and Enterprises. Now SOA is widely used by Enterprises as it provides seamless environment, flexibility, interoperability, but at the same time security should also consider because the basic SOA framework doesn�t possess any security. It depends upon the respective proprietor for security [1]. In recent times many research work had done for SOA security. Researchers have also proposed various frameworks and models such as FIX [2], SAVT [3] which tries a lot, but cannot achieve any landmark as they are based on XML schema.This proposed novel work contains an inbuilt security module which was based on PKI. At the same time this model will intact the flexibility and interoperability as the security module is embedded by analyzing the nature of WSDL, UDDI, SOAP and XML. These protocols are also compatible with PKI. Proposed Model was implemented in the asp.net environment then experimental results are compared with other security methods such as data mining based web security and automata based web security