Abstract
Software companies are experiencing a persistent business demand for new software projects. Even though a sophisticated software product can utilize its modularity with intention to improve in specific area, every change with higher complexity may cause that the software project lowers its success by exceeding planned time and resources. The situation is no different in the field of economic and juristic applications. The intent of this paper is to mention a description of security solution design to create possibilities for company collaboration, to enhance the identity security and to improve the usability. Within the design phase there is an opportunity to reuse existing and proven standard solutions. The presented example of Security Assertion Markup Language Single Sign-On (SAML SSO) design deals with securing several multidomain web applications with a common user base. Within the design, Spring Security is highlighted for its reinforcement in modularity and strong popularity within Java programmers. Considering different design views using the methodology MMDIS, the SAML SSO design is prescribed to unite the existing software projects with the goal to offer complex, usable, and secure products to customers.

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