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«ETSI TR 102 021-7 V1.1.1 (2001-12) Technical Report Terrestrial Trunked Radio (TETRA); User Requirement Specification TETRA Release 2; Part 7: Security 2 ...»

ETSI TR 102 021-7 V1.1.1 (2001-12)

Technical Report

Terrestrial Trunked Radio (TETRA);

User Requirement Specification TETRA Release 2;

Part 7: Security

2 ETSI TR 102 021-7 V1.1.1 (2001-12)

Reference

DTR/TETRA-01077

Keywords

TETRA, user, security

ETSI

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Individual copies of the present document can be downloaded from:

http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF).

In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat.

Users of the present document should be aware that the document may be subject to revision or change of status.

Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp

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editor@etsi.fr Copyright Notification No part may be reproduced except as authorized by written permission.

The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2001.

All rights reserved.

ETSI

–  –  –

Contents Intellectual Property Rights

Foreword

Introduction

1 Scope

2 References

3 Definitions and abbreviations

3.1 Definitions

3.2 Abbreviations

4 User Requirement Specification

4.1 User Requirements from Questionnaire

4.2 User Requirements derived from work on TETRA Release 1

4.3 Core Requirements

4.4 Work Required

4.5 Testing requirements

4.6 Timescales

Annex A: Bibliography

History

ETSI 4 ETSI TR 102 021-7 V1.1.1 (2001-12) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http://webapp.etsi.org/IPR/home.asp).

Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document.

Foreword This Technical Report (TR) has been produced by ETSI Project Terrestrial Trunked Radio (TETRA).

The present document is part 7 of a multi-part deliverable covering the User Requirement Specifications (URSs) for

TETRA Release 2, as identified below:

Part 1: "General Overview";

–  –  –

Introduction The TETRA Release 2 suite of standards was mandated in the new Terms of Reference (ToR) for ETSI Project TETRA approved at ETSI Board meeting number 28 (Board 28) on 6th September 2000 [7][8]. Its aim was to enhance the services and facilities of TETRA in order to meet the emerging user requirements, utilize new technologies and, by maintaining the competitiveness with other wireless technologies, increase the futureproofness of TETRA as the standard for PMR and PAMR world-wide.

The approved programme for TETRA Release 2 covers five work areas, namely:

• high speed data;

• speech coding;

• air interface enhancements;

• interworking and roaming;

–  –  –

and the User Requirement Specification for each of these work areas is covered by its own document. In addition, though not listed as a separate area of activity in the approved work programme, any significant market requirement for enhancement to TETRA Security will also be taken on board and is covered by a separate URS.

The present document provides the User Requirement Specification for Security.

–  –  –

1 Scope The present document outlines core requirements, required work and timescales for security standardization of TETRA Release 2.

The present document is applicable to the specification of TETRA Release 2 equipment.

Although high level requirements are proposed by the present document, it is considered restrictive to mandate particular security implementations at this point, until a revised threat analysis has been undertaken.

2 References

For the purposes of this Technical Report (TR) the following references apply:





–  –  –

3.1 Definitions

For the purposes of the present document, the following terms and definitions apply:

TETRA Release 2: Work Programme with new terms of reference within ETSI Project TETRA to enhance the services and facilities of TETRA in order to meet new user requirements, utilize new technology and increase the longevity of TETRA within the traditional market domains of PMR and PAMR 3.2 Abbreviations

For the purposes of the present document, the following abbreviations apply:

–  –  –

4.1 User Requirements from Questionnaire Due to the specialist nature of security requirements and also due in some part to the sensitivity of users to discuss in open forum threats to any current standard, it was not considered appropriate to collect security requirements as part of the wider TETRA Release 2 User Questionnaire (see bibliography).

4.2 User Requirements derived from work on TETRA Release 1 TETRA Release 1 and TETRA Release 2 should be maintained at an equal level of security. If further enhancements to the security of TETRA Release 2 are required, they should be applicable to both TETRA Release 1 and Release 2. This is considered fundamental to Public Safety users as current and future systems must be implemented such that security accreditation can be achieved. This also applies to possible "stand-alone" developments such as HSD through TAPS.

It should be noted that security requirements apply to the standard as a whole, and individual requirements may not need satisfying with explicit security requirements, e.g. integrity can be checked with non-cryptographic integrity checking error correction schemes when used in conjunction with encryption schemes which may in themselves not provide integrity checks.

4.3 Core Requirements Although system requirements should be derived from the new threat analysis, it is considered probable that as a

minimum the following core requirements will need to be supported by TETRA Release 2:

• the system should be able to provide authentication of the terminal, the infrastructure and the end user;

• the system should be able to provide confidentiality protection for user plane information over the air interface;

• the system should be able to provide confidentiality and integrity protection of control plane information over the air interface;

• the system should be able to provide replay protection for both user plane and control plane information over the air interface for a sufficient period to meet international Public Safety and commercial markets;

• the structure of TETRA Release 2 keys shall be identical to TETRA Release 1 keys. (By "structure" we mean the length of the key, the length of the key number (e.g. GCK-N) and the length of the key version number (e.g. GCK-VN)). TETRA Release 2 shall use the same encryption algorithms as TETRA Release 1;

• the authentication and OTAR mechanisms used in TETRA Release 2 shall be the same as the TETRA Release 1 authentication and OTAR mechanisms;

• the remote enable and disable functions of TETRA Release 1 shall apply to TETRA Release 2 systems and mobile stations;

–  –  –

• where TETRA Release 2 systems and mobile stations support TETRA Release 1 circuit-mode calls, it shall be possible to provide additional protection for user plane information by means of end-to-end encryption according to TETRA MoU Recommendation 02 [9]. If circuit-mode calls are to be supported in TETRA Release 2, it must be possible to provide them with end-to-end encryption according to TETRA MoU Recommendation 02 [9];

• the system should be able to support a secure mechanism whereby information held on the SIM is protected from unauthorized access;

• the security aspects of a SIM specified for a TETRA Release 2 mobile station must be able to support all TETRA Release 1 SIM security features in the same mobile station.

It should be recognized that these requirements may exceed those needed by some commercial operators. In these cases it may be appropriate to allow implementations that provide a lower level of protection as with the different classes that are supported within TETRA Release 1.

4.4 Work Required It is considered appropriate that a revised threat analysis is produced to encompass any new services and Facilities that become available through TETRA Release 2. WG6 should also work with other WGs to ensure that the security requirements are passed through to any new standards that are produced.

4.5 Testing requirements The new security requirements should be traceable to a new threat analysis.

4.6 Timescales Security standardization should be completed in line with other developments such as Air Interface Enhancements and HSD. This should ensure that any users wishing to migrate their systems from TETRA 1 to Release 2 are not be subject to any increased threat.

–  –  –

Annex A:

Bibliography EPT13(00)17r1: "TETRA Release 2 Work Programme".

EPT/WG1(01)046v9: "ETSI Project TETRA (EPT) TETRA Release 2 Questionnaire".



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