There are many legacy code applications that cannot be\udrun in Grid environment without significant modifications.\udTo avoid re-engineering of legacy code, we developed the\udGrid Execution Management for Legacy Code Architecture\ud(GEMLCA) that enables deployment of legacy code\udapplications as Grid services. GEMLCA is an OGSI Grid\udservice layer that supports submitting jobs, getting their\udresults and status back. Security requirements are essential\udto any Grid application to preserve the confidentiality and\udintegrity of data. To meet these requirements the GT3\udsecurity model was implemented in GEMLCA. The paper\udintroduces GEMLCA and how Grid Security Infrastructure\ud(GSI) components have been added to GEMLCA in order\udto enable secure execution of jobs in Grid. The paper also\udpresents how a legacy code traffic simulator was transformed into a Grid service using GEMLCA and gives\udsome simulation results.\ud
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