ETSI EN 300 175-7 V2.5.1 (2013-08)

Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 7: Security features

REN/DECT-000268-7

Digitalne izboljšane brezvrvične telekomunikacije (DECT) - Skupni vmesnik (CI) - 7. del: Varnostne lastnosti

Ta dokument je eden od delov specifikacije skupnega vmesnika (CI) za digitalne izboljšane brezvrvične telekomunikacije (DECT). V tem dokumentu so določeni varnostna arhitektura, vrste zahtevanih kriptografskih algoritmov in način njihove uporabe ter zahteve za integriranje varnostnih lastnosti arhitekture v DECT CI. Opisuje tudi načine upravljanja funkcij ter njihovo povezavo z določenimi fiksnimi sistemi DECT in lokalnimi konfiguracijami omrežij. Varnostna arhitektura je določena v okviru varnostnih storitev, ki jih podpira skupni vmesnik, pri čemer mehanizmi tega vmesnika zagotavljajo storitve ter kriptografske parametre, ključe in procese, povezane s temi mehanizmi. Varnostni procesi, določni v tem dokumentu, so osnovani na treh kriptografskih algoritmih:
- algoritem preverjanja pristnosti;
- generator toka ključev za šifriranje plasti kode MAC; in
- generator toka ključev in generator kode MAC za preverjeno šifriranje CCM. Vendar je arhitektura neodvisna od algoritma, zato je načeloma mogoče uporabiti algoritme standarda DRCT, ustrezne lastniške algoritme ali kombinacijo obeh. Uporaba algoritma je določena v tem dokumentu. Integriranje varnostnih lastnosti je določeno v okviru protokolnih elementov in postopkov, ki so potrebni v plasteh NWK in MAC skupnega vmesnika. Razmerje med varnostnimi lastnostmi in različnimi omrežnimi elementi je opisano glede na lokacije, na katerih bodo zagotovljeni varnostni postopki in funkcije upravljanja. Ta dokument ne obravnava vprašanj uvedbe. Ta dokument na primer ne vsebuje nobene navedbe, ki bi določala uvedbo DSAA ali DSAA2 v PP med proizvodnjo oz. uvedbo DSAA, DSAA2 ali lastniškega algoritma za preverjanje pristnosti v snemljivi modul. Prav tako ta dokument ne določa uvedbe DSC ali DSC2 v strojno opremo vseh PP-jev med proizvodnjo oz. proizvodnje posebnih PP-jev z vgrajenimi DSC, DSC2 ali lastniškimi šiframi. Varnostna arhitektura podpira vse te možnosti, čeprav lahko uporaba lastniških algoritmov omejuje gostovanje in hkratno uporabo PP-jev v različnih okoljih. V okviru standardnih algoritmov za preverjanje pristnosti so DSAA2, DSC2 in CCM močnejši od DSAA in DSC ter zagotavljajo nadstandardno zaščito. DSAA2 in DCS2 temeljita na AES [10] ter sta bila izdelana leta 2011. Tudi CCM temelji na AES [10] in je bil v standard dodan leta 2012. Ta dokument vključuje novo generacijo digitalnih izboljšanih brezvrvičnih telekomunikacij, nadaljnji razvoj standarda za digitalne izboljšane brezvrvične telekomunikacije, ki uvaja širokopasovni govor, izpopolnjene podatkovne storitve, nove tipe rež in druge tehnične izpopolnitve. Ta dokument vključuje tudi DECT ULE (ultra nizka poraba energije), podatkovno tehnologijo nizke stopnje, ki temelji na DECT in je namenjena uporabi M2M z ultra nizko porabo energije.

General Information

• Status: Published
• Publication Date: 26-Aug-2013
• Technical Committee: DECT - Digital Enhanced Cordless Telecommunications (DECT)
• Current Stage: 12 - Completion
• Due Date: 03-Sep-2013
• Completion Date: 27-Aug-2013
• Ref Project: SIST EN 300 175-7 V2.5.1:2013 - Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 7: Security features

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 300 175-7 V2.5.1:2013
01-oktober-2013
'LJLWDOQHL]EROMãDQHEUH]YUYLþQHWHOHNRPXQLNDFLMH'(&76NXSQLYPHVQLN&,
GHO9DUQRVWQHODVWQRVWL
Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part
7: Security features
Ta slovenski standard je istoveten z: EN 300 175-7 Version 2.5.1
ICS:
33.070.30 'LJLWDOQHL]EROMãDQH Digital Enhanced Cordless
EUH]YUYLþQHWHOHNRPXQLNDFLMH Telecommunications (DECT)
'(&7
SIST EN 300 175-7 V2.5.1:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 300 175-7 V2.5.1:2013

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SIST EN 300 175-7 V2.5.1:2013
ETSI EN 300 175-7 V2.5.1 (2013-08)






European Standard
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 7: Security features

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SIST EN 300 175-7 V2.5.1:2013
 2 ETSI EN 300 175-7 V2.5.1 (2013-08)



Reference
REN/DECT-000268-7
Keywords
authentication, DECT, IMT-2000, mobility, radio,
security, TDD, TDMA
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SIST EN 300 175-7 V2.5.1:2013
 3 ETSI EN 300 175-7 V2.5.1 (2013-08)
Contents
Intellectual Property Rights . 9
Foreword . 9
Introduction . 10
1 Scope . 14
2 References . 14
2.1 Normative references . 15
2.2 Informative references . 15
3 Definitions and abbreviations . 16
3.1 Definitions . 16
3.2 Abbreviations . 16
4 Security architecture . 18
4.1 Background . 18
4.2 Security services . 19
4.2.1 Authentication of a PT . 19
4.2.2 Authentication of an FT . 19
4.2.3 Mutual authentication . 19
4.2.4 Data confidentiality. 19
4.2.5 User authentication . 19
4.3 Security mechanisms . 19
4.3.1 Authentication of a PT (type 1 procedure) . 20
4.3.2 Authentication of an FT (type 1 procedure) . 21
4.3.3 Mutual authentication . 22
4.3.4 Data confidentiality. 23
4.3.4.1 Derived Cipher Key (DCK) . 23
4.3.4.2 Static Cipher Key (SCK) . 23
4.3.4.3 Default Cipher Key (DefCK) . 23
4.3.5 User authentication . 24
4.3.6 Authentication of a PT (type 2 procedure) . 24
4.3.7 Authentication of a FT (type 2 procedure) . 27
4.4 Cryptographic parameters and keys . 29
4.4.1 Overview . 29
4.4.2 Cryptographic parameters . 29
4.4.2.1 Provisions related to the generation of random numbers . 32
4.4.3 Cryptographic keys . 32
4.4.3.1 Authentication key K . 32
4.4.3.2 Authentication session keys KS and KS' . 33
4.4.3.3 Cipher key CK . 34
4.5 Security processes . 34
4.5.1 Overview . 34
4.5.2 Derivation of authentication key, K . 34
4.5.2.1 K is derived from UAK . 34
4.5.2.2 K is derived from AC . 35
4.5.2.3 K is derived from UAK and UPI . 35
4.5.3 Authentication processes . 35
4.5.3.1 Processes for the derivation of KS and KS' . 35
4.5.3.2 Processes for the derivation of DCK, RES1 and RES2 . 36
4.5.4 Key stream generation . 37
4.5.5 CCM Authenticated Encryption . 37
4.6 Combinations of security services . 38
4.6.1 Combinations of security algorithms . 38
4.6.1.1 Limitations related to capering algorithms . 38
5 Algorithms for security processes . 39
5.1 Background . 39
5.1.1 A algorithm . 39
ETSI

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SIST EN 300 175-7 V2.5.1:2013
 4 ETSI EN 300 175-7 V2.5.1 (2013-08)
5.1.1.1 A algorithm, DSAA based (A-DSAA) . 39
5.1.1.2 A algorithm, DSAA2 based (A-DSAA2) . 39
5.1.1.3 A algorithm, proprietary . 40
5.2 Derivation of session authentication key(s) . 40
5.2.1 A11 process . 40
5.2.2 A21 process . 41
5.3 Authentication and cipher key generation processes . 42
5.3.1 A12 process . 42
5.3.2 A22 process . 42
5.4 CCM algorithm . 43
6 Integration of security . 43
6.1 Background . 43
6.2 Association of keys and identities . 43
6.2.1 Authentication key . 43
6.2.1.1 K is derived from UAK . 44
6.2.1.2 K derived from AC. 44
6.2.1.3 K derived from UAK and UPI . 44
6.2.2 Cipher keys . 44
6.2.3 Cipher keys for CCM . 45
6.2.3.1 Single use of the keys for CCM . 45
6.3 NWK layer procedures . 46
6.3.1 Background . 46
6.3.2 Authentication exchanges . 47
6.3.3 Authentication procedures . 48
6.3.3.1 Authentication of a PT type 1 procedure . 48
6.3.3.2 Authentication of an FT type 1 procedure . 48
6.3.3.3 Authentication of a PT type 2 procedure . 49
6.3.3.4 Authentication of an FT type 2 procedure . 49
6.3.4 Transfer of Cipher Key, CK. 50
6.3.5 Re-Keying . 50
6.3.6 Encryption with Default Cipher Key . 50
6.3.7 Transfer of Cipher Key CK for CCM . 50
6.3.7.1 Transfer by Virtual Call setup CC procedure . 50
6.3.7.2 Transfer using MM procedures for CCM re-keying and sequence reset . 51
6.4 MAC layer procedures . 51
6.4.1 Background . 51
6.4.2 MAC layer field structure . 51
6.4.3 Data to be encrypted . 52
6.4.4 Encryption process . 53
6.4.5 Initialization and synchronization of the encryption process . 56
6.4.5.1 Construction of CK . 56
6.4.5.2 The Initialization Vector (IV) . 56
6.4.5.3 Generation of two Key Stream segments . 56
6.4.6 Encryption mode control . 57
6.4.6.1 Background . 57
6.4.6.2 MAC layer messages. 57
6.4.6.3 Procedures for switching to encrypt mode . 57
6.4.6.4 Procedures for switching to clear mode . 62
6.4.6.5 Procedures for re-keying . 63
6.4.7 Handover of the encryption process . 64
6.4.7.1 Bearer handover, uninterrupted ciphering . 65
6.4.7.2 Connection handover, uninterrupted ciphering . 65
6.4.7.3 External handover - handover with ciphering . 65
6.4.8 Modifications for half and long slot specifications (2-level modulation) . 66
6.4.8.1 Background . 66
6.4.8.2 MAC layer field structure . 66
6.4.8.3 Data to be encrypted. 66
6.4.8.4 Encryption process . 67
6.4.8.5 Initialization and synchronization of the encryption process . 67
6.4.8.6 Encryption mode control . 67
6.4.8.7 Handover of the encryption process . 67
ETSI

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SIST EN 300 175-7 V2.5.1:2013
 5 ETSI EN 300 175-7 V2.5.1 (2013-08)
6.4.9 Modifications for double slot specifications (2-level modulation) . 67
6.4.9.1 Background . 67
6.4.9.2 MAC layer field structure . 68
6.4.9.3 Data to be encrypted. 68
6.4.9.4 Encryption process . 69
6.4.9.5 Initialization and synchronization of the encryption process . 70
6.4.9.6 Encryption mode control . 70
6.4.9.7 Handover of the encryption process . 70
6.4.10 Modifications for multi-bearer specifications . 70
6.4.11 Modifications for 4-level, 8-level, 16-level and 64-level modulation formats . 71
6.4.11.1 Background . 71
6.4.11.2 MAC layer field structure . 71
6.4.11.3 Data to be encrypted. 71
6.4.11.4 Encryption process . 71
6.4.11.4.1 Encryption process for the A-field and for the unprotected format . 72
6.4.11.4.2 Encryption process for the single subfield protected format . 73
6.4.11.4.3 Encryption process for the multi-subfield protected format . 74
6.4.11.4.4 Encryption process for the constant-size-subfield protected format . 76
6.4.11.4.5 Encryption process for the encoded protected format (MAC service I ) . 76
PX
6.4.11.5 Initialization and synchronization of the encryption process . 78
6.4.11.6 Encryption mode control . 78
6.4.11.7 Handover of the encryption process . 78
6.4.12 Procedures for CCM re-keying and sequence reset . 78
6.5 Security attributes . 78
6.5.1 Background . 78
6.5.2 Authentication protocols . 79
6.5.2.1 Authentication of a PT type 1 procedure . 79
6.5.2.2 Authentication of an FT type 1 procedure . 80
6.5.2.3 Authentication of a PT type 2 procedure . 81
6.5.2.4 Authentication of an FT type 2 procedure . 82
6.5.3 Confidentiality protocols . 83
6.5.4 Access-rights protocols . 85
6.5.5 Key numbering and storage . 86
6.5.5.1 Authentication keys . 86
6.5.5.2 Cipher keys . 86
6.5.6 Key allocation . 87
6.5.6.1 Introduction . 87
6.5.6.2 UAK allocation (DSAA algorithm) . 88
6.5.6.3 UAK allocation (DSAA2 algorithm) . 89
6.6 DLC layer procedures . 89
6.6.1 Background . 89
6.6.2 CCM Authenticated Encryption . 90
6.6.2.1 CCM operation . 90
6.6.2.2 Key management . 90
6.6.2.3 CCM Initialization Vector . 91
6.6.2.3.1 CCM Initialization Vector: first byte . 91
6.6.2.3.2 CCM Initialization Vector: bytes 8-11 . 91
6.6.2.3.3 CCM Initialization Vector: bytes 12. 92
6.6.2.4 CCM Sequence Number . 92
6.6.2.5 CCM Start and Stop . 92
6.6.2.6 CCM Sequence resetting and re-keying . 93
7 Use of security features . 93
7.1 Background . 93
7.2 Key management options . 93
7.2.1 Overview of security parameters relevant for key management . 93
7.2.2 Generation of authentication keys . 94
7.2.3 Initial distribution and installation of
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