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TR 33.888SA3
Study on Security issues to support
Group Communication System Enablers (GCSE) for LTE

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V12.1.0 (Wzip)  2014/09  44 p.

Rapporteur:  Mr. Merkel, Jürgen

To position LTE as technology for critical communications such as public safety, security for Group Communication (GC) needs to be considered. Group Communication function complements its sibling communication feature of Proximity-based Services (ProSe).
The present document studies the security aspects of the Group Communication Service Enabler for LTE (GCSE_LTE) and gives an evaluation of possible technical security solutions supporting such an Enabler. The present document looks at security from system perspective and defines functional security requirements for all entities. Stage 1 requirements for these services are defined in TS 22.468.
Different possible Stage 2 solutions for GCSE have been studied in TR 23.768. TS 23.468 provides the stage 2 description for the 3GPP system provided enablers to support GC services using E-UTRAN in Rel-12.
Based on the work done in TS 22.468, TR 23.768, and TS 23.468 the objectives of the present document are to identify the threats and deduce security requirements, develop GCSE_LTE security solutions, and determine which solution(s) from the present document (Study/TR phase) should be converted into normative specifications for Rel-12.

full Table of Contents for  TR 33.888  Word version:   12.1.0

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1  ScopeWord-p. 6
2  ReferencesWord-p. 7
3  Definitions and abbreviationsWord-p. 8
4  Overview of Group Communication Service Enabler (GCSE)Word-p. 9
5  GCSE security architectureWord-p. 11
6  Key issues for GCSE securityWord-p. 12
6.1  Key issue: Security in critical communication scenarios
6.2  Key issue: Interaction with ProSe securityWord-p. 14
6.3  Key issue: Security across Unicast and Multicast modesWord-p. 18
6.4  Key issue: Level of applying security for mitigation of GCSE risks/threatsWord-p. 23
6.5  Key Issue: GCSE security between UE and GCSE ASWord-p. 27
6.6  Key issue: Communication between GCSE AS and BM-SC (MB2 interface)Word-p. 29
6.7  Key issue: Transmitting Group Member identificationWord-p. 31
6.8  Key issue: Adding and removing group membersWord-p. 32
6.9  Key issue: Illegitimate access to UEWord-p. 34
6.10  Key Issue: GCSE_LTE interaction with ProSe UE-to-Network RelaysWord-p. 35
6.11  Key Issue: Group key compromiseWord-p. 36
6.12  Key issue: Securing keys in the UEWord-p. 37
6.13  Key issue: Decision point for using PtP and/or PtMWord-p. 38
6.14  Key issue: Performance and scalabilityWord-p. 39
7  Summary of threat and risk analysisWord-p. 40
8  Potential security requirements for Rel-12Up
9  Potential security solutionsWord-p. 41
10  ConclusionsWord-p. 42
A  Change historyWord-p. 44

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