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In the last decade, cloud computing has become an effective and efficient service delivery platform to offer resources, innovation, and economies of scale on telecommunication networks. An allocation scheme without security constraints consideration may assign the high security-sensitive tasks onto the lower trustworthy machines. This would lead the performance deterioration. To address this issue, in this paper, a security-prioritized multiple workflow allocation (SPMWA) model is proposed by integrating the security-prioritized mapping scheme for Infrastructure-as-a-Service cloud computing environment. It is expected that incorporating a security-prioritized allocation scheme under precedence constraints will enhance the performance of workflow processing in risk-prone environments. In this model, more priority is given to tasks with high-security demand to get allocated onto the more trustworthy virtual …