Software Development life cycle is the concrete process to develop software product, but it is still to be refined to handle Non-functional requirements at all stages of the life cycle of the product development. To develop 100% successful product, there must be equal importance between functional requirements and Non functional requirements. Some of those NFR's are Performance, Reliability, Security, Operability, Modifiability etc. The design decisions are resolved at early stages if it is possible to encompass all non functional requirements along with the functional requirements in all phases of SDLC. This paper focuses on importance of NFR (security) design in architecture phase of SDLC and proposes a methodology to include security feature using security design patterns. As a case study we have illustrated this methodology to iLocking system Application. We believe "including security design patterns in Architecture is resistant to insecure features". Our approach is most suitable for the security critical applications; such applications can be run on any device irrespective of mobile platform or fixed platform with high security. With this we will achieve secure SDLC at one phase i.e. Architecture phase.
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