ETSI TS 133 401 V15.8.0 (2019-07)

Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; 3GPP System Architecture Evolution (SAE); Security architecture (3GPP TS 33.401 version 15.8.0 Release 15)

RTS/TSGS-0333401vf80

General Information

• Status: Published
• Publication Date: 01-Jul-2019
• Technical Committee: 3GPP SA 3 - Security
• Current Stage: 12 - Completion
• Completion Date: 02-Jul-2019

Standards Content (Sample)

ETSI TS 133 401 V15.8.0 (2019-07)






TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
3GPP System Architecture Evolution (SAE);
Security architecture
(3GPP TS 33.401 version 15.8.0 Release 15)

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3GPP TS 33.401 version 15.8.0 Release 15 1 ETSI TS 133 401 V15.8.0 (2019-07)



Reference
RTS/TSGS-0333401vf80
Keywords
GSM,LTE,SECURITY,UMTS
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3GPP TS 33.401 version 15.8.0 Release 15 2 ETSI TS 133 401 V15.8.0 (2019-07)
Intellectual Property Rights
Essential patents
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pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
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Modal verbs terminology
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ETSI

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3GPP TS 33.401 version 15.8.0 Release 15 3 ETSI TS 133 401 V15.8.0 (2019-07)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 10
1 Scope . 11
2 References . 11
3 Definitions, symbols and abbreviations . 13
3.1 Definitions . 13
3.2 Symbols . 14
3.3 Abbreviations . 15
3.4 Conventions . 16
4 Overview of Security Architecture . 17
5 Security Features . 17
5.1 User-to-Network security . 17
5.1.0 General . 17
5.1.1 User identity and device confidentiality . 18
5.1.2 Entity authentication . 18
5.1.3 User data and signalling data confidentiality . 18
5.1.3.1 Ciphering requirements . 18
5.1.3.2 Algorithm Identifier Values . 19
5.1.4 User data and signalling data integrity . 19
5.1.4.1 Integrity requirements . 19
5.1.4.2 Algorithm Identifier Values . 19
5.2 Security visibility and configurability . 20
5.3 Security requirements on eNodeB . 20
5.3.1 General . 20
5.3.2 Requirements for eNB setup and configuration . 20
5.3.3 Requirements for key management inside eNB . 21
5.3.4 Requirements for handling User plane data for the eNB . 21
5.3.4a Requirements for handling Control plane data for the eNB . 21
5.3.5 Requirements for secure environment of the eNB . 21
5.4 Void . 22
6 Security Procedures between UE and EPC Network Elements . 22
6.0 General . 22
6.1 Authentication and key agreement . 22
6.1.1 AKA procedure . 22
6.1.2 Distribution of authentication data from HSS to serving network . 23
6.1.3 User identification by a permanent identity . 24
6.1.4 Distribution of IMSI and authentication data within one serving network domain . 25
6.1.5 Distribution of IMSI and authentication data between different serving network domains. 26
6.1.6 Distribution of IMSI and UMTS authentication vectors between MMEs or between MME and
SGSN . 26
6.2 EPS key hierarchy . 27
6.3 EPS key identification . 29
6.4 Handling of EPS security contexts . 30
6.5 Handling of NAS COUNTs. 31
7 Security procedures between UE and EPS access network elements . 32
7.0 General . 32
7.1 Mechanism for user identity confidentiality . 32
7.2 Handling of user-related keys in E-UTRAN . 32
7.2.1 E-UTRAN key setting during AKA . 32
7.2.2 E-UTRAN key identification . 32
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3GPP TS 33.401 version 15.8.0 Release 15 4 ETSI TS 133 401 V15.8.0 (2019-07)
7.2.3 E-UTRAN key lifetimes . 33
7.2.4 Security mode command procedure and algorithm negotiation . 33
7.2.4.1 Requirements for algorithm selection . 33
7.2.4.2 Procedures for AS algorithm selection . 34
7.2.4.2.1 Initial AS security context establishment . 34
7.2.4.2.2 X2-handover . 34
7.2.4.2.3 S1-handover . 34
7.2.4.2.4 Intra-eNB handover . 34
7.2.4.3 Procedures for NAS algorithm selection . 34
7.2.4.3.1 Initial NAS security context establishment . 34
7.2.4.3.2 MME change . 35
7.2.4.4 NAS security mode command procedure . 35
7.2.4.5 AS security mode command procedure . 36
7.2.4a Algorithm negotiation for unauthenticated UEs in LSM . 37
7.2.5 Key handling at state transitions to and away from EMM-DEREGISTERED . 38
7.2.5.1 Transition to EMM-DEREGISTERED . 38
7.2.5.2 Transition away from EMM-DEREGISTERED . 39
7.2.5.2.1 General . 39
7.2.5.2.2 With existing native EPS NAS security context . 39
7.2.5.2.3 With run of EPS AKA . 40
7.2.6 Key handling in ECM-IDLE to ECM-CONNECTED and ECM-CONNECTED to ECM-IDLE
transitio ns . 40
7.2.6.1 ECM-IDLE to ECM-CONNECTED transition. 40
7.2.6.2 Establishment of keys for cryptographically protected radio bearers . 40
7.2.6.3 ECM-CONNECTED to ECM-IDLE transition. 41
7.2.7 Key handling for the TAU procedure when registered in E-UTRAN . 41
7.2.8 Key handling in handover . 42
7.2.8.1 General . 42
7.2.8.1.1 Access stratum . 42
7.2.8.1.2 Non access stratum . 43
7.2.8.2 Void. 43
7.2.8.3 Key derivations for context modification procedure . 43
7.2.8.4 Key derivations during handovers . 44
7.2.8.4.1 Intra-eNB Handover . 44
7.2.8.4.2 X2-handover . 44
7.2.8.4.3 S1-Handover . 44
7.2.8.4.4 UE handling . 45
7.2.9 Key-change-on-the fly . 45
7.2.9.1 General . 45
7.2.9.2 K re-keying . 45
eNB
7.2.9.3 KeNB refresh . 46
7.2.9.4 NAS key re-keying . 46
7.2.10 Rules on Concurrent Running of Security Procedures . 46
7.2.11 Suspend and resume of RRC connection . 47
7.2.11.1 General . 47
7.2.11.2 RRC connection suspend . 47
7.2.11.3 RRC connection resume to a new eNB . 48
7.2.11.4 RRC connection resume to the same eNB . 49
7.3 UP security mechanisms . 50
7.3.1 UP confidentiality mechanisms . 50
7.3.2 UP integrity mechanisms . 50
7.4 RRC security mechanisms . 50
7.4.1 RRC integrity mechanisms . 50
7.4.2 RRC confidentiality mechanisms . 51
7.4.3 K * and Token Preparation for the RRCConnectionRe-establishment Procedure . 51
eNB
7.4.4 RRCConnectionRe-establishment Procedure for Control Plane CIoT EPS optimisation . 52
7.5 Signalling procedure for periodic local authentication . 53
8 Security mechanisms for non-access stratum signalling and data via MME . 53
8.0 General . 53
8.1 NAS integrity mechanisms . 54
8.1.1 NAS input parameters and mechanism . 54
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3GPP TS 33.401 version 15.8.0 Release 15 5 ETSI TS 133 401 V15.8.0 (2019-07)
8.1.2 NAS integrity activation . 54
8.2 NAS confidentiality mechanisms . 55
9 Security interworking between E-UTRAN and UTRAN . 55
9.1 RAU and TAU procedures . 55
9.1.1 RAU procedures in UTRAN . 55
9.1.2 TAU procedures in E-UTRAN . 56
9.2 Handover . 58
9.2.1 From E-UTRAN to UTRAN . 58
9.2.2 From UTRAN to E-UTRAN . 59
9.2.2.1 Procedure . 59
9.2.2.2 Derivation of NAS keys and K during Handover from UTRAN to E-UTRAN . 63
eNB
9.3 Recommendations on AKA at IRAT-mobility to E-UTRAN . 63
9.4 Attach procedures . 64
9.4.1 Attach in UTRAN . 64
10 Security interworking between E-UTRAN and GERAN . 64
10.1 General . 64
10.2 RAU and TAU procedures . 65
10.2.1 RAU procedures in GERAN . 65
10.2.2 TAU procedures in E-UTRAN . 65
10.3 Handover . 65
10.3.1 From E-UTRAN to GERAN . 65
10.3.2 From GERAN to E-UTRAN . 65
10.3.2.1 Procedures . 65
10.4 Recommendations on AKA at IRAT-mobility to E-UTRAN . 65
10.5 Attach procedures . 66
10.5.1 Attach in GERAN . 66
11 Network Domain Control Plane protection . 66
12 Backhaul link user plane protection . 66
13 Management plane protection over the S1 interface . 67
14 SRVCC between E-UTRAN and Circuit Switched UTRAN/GERAN . 68
14.1 From E-UTRAN to Circuit Switched UTRAN/GERAN . 68
14.2 Emergency call in SRVCC from E-UTRAN to circuit switched UTRAN/GERAN . 69
14.3 SRVCC from circuit switched UTRAN/GERAN to E-UTRAN . 69
14.3.1 Procedure . 69
15 Security Aspects of IMS Emergency Session Handling . 72
15.1 General . 72
15.2 Security procedures and their applicability . 73
15.2.1 Authenticated IMS Emergency Sessions . 73
15.2.1.1 General . 73
15.2.1.2 UE and MME share a current security context . 73
15.2.2 Unauthenticated IMS Emergency Sessions . 74
15.2.2.1 General . 74
15.2.2.2 UE and MME share no security context . 75
15.2.3 Void . 76
15.2.4 Key generation procedures for unauthenticated IMS Emergency Sessions . 76
15.2.4.1 General . 76
15.2.4.2 Handover . 76
16 Void . 76
Annex A (normative): Key derivation functions . 77
A.1 KDF interface and input parameter construction . 77
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