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Content for  TR 33.888  Word version:  12.1.0

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4  Overview of Group Communication Service Enabler (GCSE)p. 9

5  GCSE security architecturep. 11

6  Key issues for GCSE securityp. 12

6.1  Key issue: Security in critical communication scenariosp. 12

6.2  Key issue: Interaction with ProSe securityp. 14

6.3  Key issue: Security across Unicast and Multicast modesp. 18

6.3.1  Key issue detailsp. 18

6.3.2  Security threatsp. 18

6.3.3  Security requirementsp. 18

6.3.4  Solutionsp. 18

6.3.5  Evaluationp. 21

6.4  Key issue: Level of applying security for mitigation of GCSE risks/threatsp. 23

6.5  Key Issue: GCSE security between UE and GCSE ASp. 27

6.6  Key issue: Communication between GCSE AS and BM-SC (MB2 interface)p. 29

6.7  Key issue: Transmitting Group Member identificationp. 31

6.8  Key issue: Adding and removing group membersp. 32

6.9  Key issue: Illegitimate access to UEp. 34

6.10  Key Issue: GCSE_LTE interaction with ProSe UE-to-Network Relaysp. 35

6.11  Key Issue: Group key compromisep. 36

6.12  Key issue: Securing keys in the UEp. 37

6.13  Key issue: Decision point for using PtP and/or PtMp. 38

6.14  Key issue: Performance and scalabilityp. 39

7  Summary of threat and risk analysisp. 40

8  Potential security requirements for Rel-12p. 40

9  Potential security solutionsp. 41

10  Conclusionsp. 42

$  Change Historyp. 44


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