ETSI TS 133 180 V14.13.0 (2026-02)

LTE; Security of the Mission Critical (MC) service (3GPP TS 33.180 version 14.13.0 Release 14)

RTS/TSGS-0333180ved0

General Information

• Status: Not Published
• Technical Committee: 3GPP SA 3 - Security
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 26-Feb-2026

Standards Content (Sample)

TECHNICAL SPECIFICATION
LTE;
Security of the Mission Critical (MC) service
(3GPP TS 33.180 version 14.13.0 Release 14)

3GPP TS 33.180 version 14.13.0 Release 14 1 ETSI TS 133 180 V14.13.0 (2026-02)

Reference
RTS/TSGS-0333180ved0
Keywords
5G,LTE
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3GPP TS 33.180 version 14.13.0 Release 14 2 ETSI TS 133 180 V14.13.0 (2026-02)
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ETSI
3GPP TS 33.180 version 14.13.0 Release 14 3 ETSI TS 133 180 V14.13.0 (2026-02)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 9
1 Scope . 10
2 References . 10
3 Definitions and abbreviations . 12
3.1 Definitions . 12
3.2 Abbreviations . 13
4 Overview of Mission Critical Security . 13
4.1 General . 13
4.2 Signalling plane security architecture. 14
4.3 MC system security architecture . 14
4.3.1 General . 14
4.3.2 User authentication and authorisation . 15
4.3.3 Identity keying of users and services . 16
4.3.4 Protection of application plane signalling . 16
4.3.5 Media security . 17
4.3.5.1 General . 17
4.3.5.2 Media security for group communications. . 17
4.3.5.3 Media security for private calls . 19
5 Common mission critical security framework . 20
5.1 User authentication and authorization . 20
5.1.1 General . 20
5.1.2 User authentication . 21
5.1.2.1 Identity management functional model . 21
5.1.2.2 User authentication framework . 22
5.1.2.3 OpenID Connect (OIDC) . 23
5.1.2.3.1 General . 23
5.1.2.3.2 User authentication example using username/password . 24
5.1.3 MCX user service authorisation. 24
5.1.3.1 General . 24
5.1.3.2 MCX user service authorization with MCX Server . 27
5.1.3.2.1 General . 27
5.1.3.2.2 Using SIP REGISTER . 27
5.1.3.2.3 Using SIP PUBLISH . 28
5.1.4 Inter-domain MCX user service authorization . 28
5.1.4.1 General . 28
5.1.4.2 Inter-domain identity management functional model . 28
5.2 Key management common elements . 30
5.2.1 Overview of key management . 30
5.2.2 Common key distribution . 31
5.2.3 Key distribution with end-point diversity . 32
5.2.4 Key distribution with associated parameters . 35
5.2.5 Key distribution with SAKKE-to-self payload . 36
5.2.6 Key distribution with identity hiding . 37
5.2.7 Key distribution across multiple security domains . 38
5.2.7.1 General . 38
5.2.7.2 Identification of External Security Domains . 38
5.2.7.3 Using multiple security domains . 39
5.3 User key management . 39
5.3.1 General . 39
5.3.2 Functional model for key management . 39
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5.3.3 Security procedures for key management . 40
5.3.4 Provisioned key material to support end-to-end communication security . 42
5.3.5 KMS Certificate . 42
5.3.6 KMS provisioned Key Set . 42
5.4 Key management from MC client to MC server (CSK upload) . 43
5.5 Key management between MCX servers (SPK) . 43
5.6 Key management for one-to-one (private) communications (PCK) . 43
5.7 Key management for group communications (GMK) . 44
5.7.1 General . 44
5.7.2 Security procedures for GMK provisioning . 44
5.7.3 Group member GMK management . 45
5.8 Key management from MC server to MC client (Key download) . 46
5.8.1 General . 46
5.8.2 ‘Key download' procedure . 46
5.9 Key management during MBMS bearer announcement . 47
5.10 UE key storage and key persistence . 47
5.10.1 Key storage . 47
5.10.2 Key persistence . 47
6 Supporting security mechanisms . 48
6.1 HTTP . 48
6.1.1 Authentication for HTTP-1 interface . 48
6.1.2 HTTP-1 interface security . 48
6.2 SIP . 48
6.2.1 Authentication for SIP core access . 48
6.2.2 SIP-1 interface security . 48
6.3 Network domain security . 49
6.3.1 LTE access authentication and security . 49
6.3.2 Inter/Intra domain interface security . 49
7 MCPTT and MCVideo . 49
7.1 General . 49
7.2 Private communications . 49
7.2.1 Key management . 49
7.2.2 Security procedures (on-network) . 49
7.2.3 Security procedures (off-network) . 51
7.2.4 First-to-answer security and key management . 52
7.2.4.1 Overview . 52
7.2.4.2 First-to-answer request and response . 53
7.2.4.3 First-to-answer call setup with security. 53
7.2.4.4 First-to-answer media protection . 55
7.2.5 Ambient listening call . 55
7.2.6 Ambient viewing call . 55
7.2.7 Private video pull . 56
7.2.7.1 One-to-one video pull . 56
7.2.7.2 One-from-server video pull . 56
7.2.8 Private video push . 57
7.2.8.1 One-to-one video push . 57
7.2.8.2 One-to-server video push . 57
7.2.8.3 Remotely initiated video push . 58
7.3 Group communications . 59
7.3.1 General . 59
7.3.2 Group creation security procedure . 60
7.3.3 Dynamic group keying . 60
7.3.3.1 General . 60
7.3.3.2 Group regrouping security procedure (within a single MC domain) . 60
7.3.3.3 Group regrouping security procedure (involving multiple MC domains) . 60
7.3.4 Broadcast group call . 62
7.3.5 Group-broadcast group call. 62
7.3.6 Emergency group call . 62
7.3.7 Imminent peril group call . 63
7.3.8 Emergency Alert . 63
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7.3.9 Remotely initiated video push to group . 63
7.4 Key derivation for media . 65
7.4.1 Derivation of SRTP master keys for private call . 65
7.4.2 Derivation of SRTP master keys for group media . 65
7.5 Media protection profile . 66
7.5.1 General . 66
7.5.2 Security procedures for media stream protection. 67
8 MCData . 69
8.1 Overview . 69
8.2 Key Management . 70
8.3 One-to-one communications . 71
8.4 Group communications . 71
8.5 MCData payload protection . 72
8.5.1 General . 72
8.5.2 Prequisites . 72
8.5.2.1 Prequisites for protected payloads . 72
8.5.2.2 Prequisites for authenticated payloads . 72
8.5.3 Key derivation for protected payloads . 72
8.5.4 Payload protection . 73
8.5.4.1 Format of protected payloads . 73
8.5.4.2 Encryption of protected payloads . 73
8.5.5 Payload authentication . 74
9 Signalling protection . 74
9.1 General . 74
9.2 Key distribution for signalling protection . 75
9.2.1 Client-Server Key (CSK) . 75
9.2.1.1 General . 75
9.2.1.2 Creation of the CSK . 75
9.2.1.3 Initial 'CSK Upload' Procedure . 75
9.2.1.4 CSK update via 'key download'. 76
9.2.2 Multicast Signalling Key (MuSiK) . 76
9.2.3 Signalling Protection Key (SPK) . 77
9.3 Application signalling security (XML protection) . 78
9.3.1 General . 78
9.3.2 Protected content . 78
9.3.3 Key agreement . 79
9.3.4 Confidentiality protection using XML encryption (xmlenc) . 79
9.3.4.1 General . 79
9.3.4.2 XML content encryption . 79
9.3.4.3 XML URI attribute encryption . 80
9.3.5 Integrity protection using XML signature (xmlsig) . 81
9.4 RTCP signalling protection (SRTCP) . 82
9.4.1 General . 82
9.4.2 Unicast RTCP protection between client and server . 82
9.4.3 Multicast RTCP protection between client and server . 83
9.4.4 Offline floor and transmission control protection . 83
9.4.5 RTCP protection between servers . 83
9.4.6 Key derivation for SRTCP . 83
9.4.7 Security procedures for transmission of RTCP content . 84
9.4.8 RTCP protection profile . 84
9.5 MCData signalling protection . 85
9.5.1 Key distribution for signalling protection . 85
9.5.2 Protection of MCData application signalling payloads (XML) . 85
9.5.3 Protection of MCData signalling payloads . 85
Annex A (normative): Security requirements . 86
A.1 Introduction . 86
A.2 Configuration & service access . 86
A.3 Group key management . 86
A.4 On-network operation . 86
A.5 Ambient listening . 87
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A.6 Data communication between MCX network entities . 87
A.7 Key stream re-use . 87
A.8 Late entry to group communication . 87
A.9 Private call confide ntiality . 87
A.10 Off-network operation . 88
A.11 Privacy of MCX service identities . 88
A.12 User authentication and authorization . 88
A.13 Inter-domain . 89
A.14 MCData . 90
A.15 Multimedia Broadcast/Multicast Service . 90
Annex B (normative): OpenID connect profile for MCX . 91
B.1 General . 91
B.2 MCX tokens . 91
B.2.1 ID token . 91
B.2.1.1 General . 91
B.2.1.2 Standard claims . 91
B.2.1.3 MCX claims . 91
B.2.2 Access token . 92
B.2.2.1 Introduction. 92
B.2.2.2 Standard claims . 92
B.2.2.3 MCX claims . 92
B.3 MCX client registration . 92
B.4 Obtaining tokens . 93
B.4.1 General . 93
B.4.2 Native MCX client . 93
B.4.2.1 General . 93
B.4.2.2 Authentication request . 93
B.4.2.3 Authentication response . 95
B.4.2.4 Access token request . 95
B.4.2.5 Access token response . 96
B.5 Refreshing an access token . 96
B.5.1 General . 96
B.5.2 Access token request . 97
B.5.3 Access token response . 97
B.6 MCX client registration with partner IdM service . 98
B.7 Obtaining an access token from a partner domain . 98
B.7.1 Overview . 98
B.7.2 Token Exchange Request . 99
B.7.3 Token Exchange Response . 100
B.7.4 Token Request . 100
B.7.5 Token Response . 102
B.8 Security tokens . 102
B.9 Access tokens for partner services . 103
B.10 Using the token to access MCX resource servers . 103
B.11 Token validation . 103
B.11.1 ID token validation . 103
B.11.2 Access token validation . 103
B.11.3 Security token validation . 103
B.12 Token revocation . 103
B.13 IdMS interface security . 103
Annex C (informative): OpenID connect detailed flow . 105
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C.1 Detailed flow for MC user authentication and registration using OpenID Connect . 105
C.2 Detailed flow for inter-domain MC user service authorization using OpenID Connect token
exchange . 106
Annex D (Normative): KMS provisioning messages . 109
D.1 General aspects . 109
D.2 KMS requests . 109
D.3 KMS responses . 110
D.3.1 General . 110
D.3.2 KMS certificates . 110
D.3.2.1 Description . 110
D.3.2.2 Fields . 111
D.3.2.3 User IDs . 111
D.3.3 User Key Provision . 111
D.3.3.1 Description . 111
D.3.3.2 Fields . 112
D.3.4 Example KMS response XML . 112
D.3.4.1 Example KMSInit XML . 112
D.3.4.2 Example KMSKeyProv XML.
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