This document contains a study of the security aspects of the Mission-Critical service. It enhances the security solutions defined for MCPTT in TS 33.179 to support the common functional architecture (MC_ARCH), enhancements to MCPTT (eMCPTT), data services (MCData), video services (MCVideo) and migration and interconnect services with partner systems (MCSMI). In each case, this study includes an analysis of the threats to the service, the security requirements to mitigate those threats and an evaluation of possible technical solutions designed to meet the security requirements of the service. Stage 2 aspects of the mission critical services are defined within TS 23.179, TS 23.280, TS 23.281, TS 23.282, TR 23.781, TR 23.782 and TS 33.179. Stage 1 requirements are defined in TS 22.179, TS 22.280, TS 22.281 and TS 22.282.

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