ETSI TS 101 053-2 V2.3.1 (2014-04)

ETSI TS 101 053-2 V2.3.1 (2014-04)






Technical Specification
Security Algorithms Group of Experts (SAGE);
Rules for the management of the TETRA standard
encryption algorithms;
Part 2: TEA2

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2 ETSI TS 101 053-2 V2.3.1 (2014-04)



Reference
RTS/TCCE-06186
Keywords
algorithm, security, TETRA
ETSI
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3 ETSI TS 101 053-2 V2.3.1 (2014-04)
Contents
Foreword . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 7
3 Definitions and abbreviations . 7
3.1 Definitions . 7
3.2 Abbreviations . 7
4 TEA2 management structure . 8
5 Use of TEA2 . 9
5.1 Primary and Secondary Users of TEA2 . 9
5.2 TEA2 States and Territories . 10
6 Licence types . 11
6.1 Manufacturer Licence . 11
6.2 Installer/Repairer/Destruction Licence . 11
6.3 Supplier Licence . 12
6.4 Primary User Licence . 12
6.5 Secondary User Licence . 12
6.6 End User Licence . 13
6.7 Destruction Licence . 13
6.8 Exceptional . 14
7 Distribution procedures . 14
7.1 Distribution of parts 1, 2 and 3 of the TEA2 specification by the TEA2 Custodian . 14
7.2 Distribution of part 3 of the TEA2 specification by the TEA2 Custodian . 15
8 Approval criteria and restrictions . 15
8.1 Approval Criteria . 15
8.2 Revocation of TEA2 licences . 16
8.3 Appeal against Licence Revocation . 16
9 The TEA2 Custodian . 17
9.1 Responsibilities . 17
9.2 Appointment . 17
Annex A (informative): Items delivered to approved recipient of TEA2 specifications . 19
Annex B (normative): Confidentiality and Restricted Usage Undertaking for
Manufacturers of TEA2 . 20
Annex C (normative): Confidentiality and Restricted Usage Undertaking for Installers,
Repairers and Destruction of TEA2 . 23
Annex D (normative): Confidentiality and Restricted Usage Undertaking for Suppliers of
Equipment or Services using TEA2 . 25
Annex E (normative): Confidentiality and Restricted Usage Undertaking for Primary and
Secondary Users of TEA2 . 27
Annex F (normative): Confidentiality and Restricted Usage Undertaking for End Users of
TEA2 . 30
Annex G (normative): Confidentiality and Restricted Usage Undertaking for Destruction of
TEA2 . 33
ETSI

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4 ETSI TS 101 053-2 V2.3.1 (2014-04)
Annex H (informative): TEA2 State and Territories list . 35
Annex I (informative): Bibliography . 36
History . 37


ETSI

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5 ETSI TS 101 053-2 V2.3.1 (2014-04)
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://ipr.etsi.org).
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 Specification (TS) has been produced by ETSI Technical Committee TETRA and Critical
Communications Evolution (TCCE).
The present document is part 2 of a multi-part deliverable covering Rules for the management of the TETRA standard
encryption algorithms, as identified below:
Part 1: "TEA1";
Part 2: "TEA2";
Part 3: "TEA3";
Part 4: "TEA4".
ETSI

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6 ETSI TS 101 053-2 V2.3.1 (2014-04)
1 Scope
The purpose of the present document is to specify the rules for the management of the TETRA standard encryption
algorithm TEA2. This algorithm is intended for air interface encryption in TETRA products.
The specification for TEA2 consists of the following three parts:
Part 1: Algorithm specification;
Part 2: Design conformance test data;
Part 3: Algorithm input/output test data.
The procedures described in the present document apply to licensing organizations to manufacture, possess, install,
repair, hold, use and destroy equipment and components containing the TEA2 algorithm and to delivering parts 1, 2 and
3 of the TEA2 specifications.
Parts 1 and 2 of the specification are confidential.
Part 3 of the specification is not confidential and can be obtained directly from the TEA2 Custodian (see clause 7.2).
There are no restrictions on the distribution of this part of the specification.
The management structure is defined in clause 4. This structure is defined in terms of the principals involved in the
management of TEA2 (ETSI, ETSI Technical Committee TETRA and Critical Communications Evolution, TEA2
Custodian and approved recipients) together with the relationships and interactions between them.
Clause 5 is concerned with the rules for the use of TEA2. This clause is supplemented by annex H, which provides an
exemplary list of the states and territories in which a User may become an approved recipient.
Clause 6 describes the types of licence that may be requested.
The procedures for delivering TEA2 specifications to approved recipients are defined in clause 7. This clause is
supplemented by annex A, which specifies the items that are to be delivered.
Clause 8 is concerned with the criteria for approving an organization for receipt of TEA2 deliverables and with the
responsibilities of an approved recipient. This clause is supplemented by annexes B to G which contain the
Confidentiality and Restricted Usage Undertakings to be signed by the TEA2 Custodian and approved recipients of
TEA2 specifications and/or equipment and components containing TEA2.
Clause 9 is concerned with the appointment and responsibilities of the TEA2 Custodian.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
Not applicable.
ETSI

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7 ETSI TS 101 053-2 V2.3.1 (2014-04)
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 300 392-7: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 7:
Security".
[i.2] ETSI ETS 300 396-6: "Terrestrial Trunked Radio (TETRA); Direct Mode Operation (DMO);
Part 6: Security".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
computer software carrier: physical storage medium capable of containing and transporting computer software or
data, such as a ROM chip, CD ROM or disk, or flash memory or computer hard drive
end user: organization that has been approved to use TEA2 by either the primary or secondary user or by the TEA2
custodian
installer: organization that installs hardware or software components containing the TETRA Standard Algorithm TEA2
into TETRA subscriber equipment, fixed network equipment or TETRA system simulators
manufacturer: bona fide designer or manufacturer of TETRA subscriber or fixed network equipment where TETRA
Standard Algorithm TEA2 is included in the systems; or a bona fide designer or manufacturer of components for
TETRA subscriber or fixed network equipment where at least one of the components includes TEA2; or a bona fide
designer or manufacturer of TETRA system simulators for approval testing of TETRA subscriber or fixed network
equipment where the simulator includes TEA2
primary user: governmental organization for a TETRA network that is primarily used by public safety organizations in
their own state or territory
repairer: organization that repairs TETRA subscriber equipment, fixed network equipment, or system simulators that
contain TEA2
secondary user: military organization in a state or territory where there is no primary user with approval to operate a
TETRA network given by the governmental organization that is responsible for public safety
supplier: supplier of TETRA subscriber or fixed network equipment in which TEA2 is included or TETRA system
simulators in which TEA2 is included, or a third party operator supplying TETRA services with TEA2 to a primary
and/or secondary user
TEA2 custodian: the interface between ETSI and recipients of TEA2 licences and specifications
user: primary or secondary user
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CRUU Confidentiality and Restricted Usage Undertaking
ETSI European Telecommunications Standards Institute
MS Mobile Station
SFPG Security and Fraud Prevention Group
SwMI Switching and Management Infrastructure
TEA2 TETRA standard Encryption Algorithm number 2
TETRA TErrestrial Trunked RAdio
ETSI

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8 ETSI TS 101 053-2 V2.3.1 (2014-04)
4 TEA2 management structure
The management structure is depicted in figure 1.
Approved recipient of TEA2
1 3 4 5 8
TEA2 Custodian
6 7
2
TEA2 register TEA2 file
a b Approval criteria
d
c
ETSI, ETSI TC TCCE

Key:
a  = Agreement between TEA2 Custodian and ETSI
b  = Status reports and recommendations
c  = Setting of approval criteria

d  = Requested details of the TEA2 register
1  = Request for TEA2 specification and/or licence
2  = Check of request against approval criteria
3 and 4 = Exchange of Confidentiality and Restricted Usage Undertaking
5  = Dispatch of TEA2 specification (only if appropriate)
6  = Update the TEA2 register
7  = Document filing
8  = Technical advice (only if requested)

Figure 1: TEA2 management structure
Figure 1 shows the three principals involved in the management of TEA2 and the relationships and interactions between
them:
• ETSI is the owner of the TEA2. ETSI Technical Committee TETRA and Critical Communications Evolution
sets the approval criteria for receipt of the algorithm (see clause 8).
• The TEA2 Custodian is the interface between ETSI and the recipients of TEA2 licences and specifications.
ETSI

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9 ETSI TS 101 053-2 V2.3.1 (2014-04)
• The TEA2 Custodian is as identified in clause 9.2 of the present document. The TEA2 Custodian's duties are
detailed in clause 9. They include distributing signed TEA2 Confidentiality and Restricted Usage
Undertakings (CRUUs) and, if appropriate, specifications to approved recipients, as detailed in clauses 7 and
8, providing limited technical advice to approved recipients and providing algorithm status reports to ETSI
Technical Committee TETRA and Critical Communications Evolution.
NOTE: A CRUU signed by both the TEA2 Custodian and applicant constitutes a licence to hold or use TETRA
subscriber and fixed network equipment and components containing TEA2.
The form of CRUU exchanged is summarized in figure 2.

Figure 2: Summary of CRUU types maintained between TEA2 principals
5 Use of TEA2
5.1 Primary and Secondary Users of TEA2
A TEA2 Primary and Secondary User Licence is given to a governmental organization for a TETRA network that is
primarily used by public safety organizations (see note 1) in their own state or territory. A TETRA network may consist
of fixed base stations and SwMI, all located in the home state or territory, and/or one or more base stations and SwMIs
that may also be used outside the home state or territory if both base stations and SwMIs are controlled from the home
state or territory. A governmental organization that obtains a TEA2 User Licence under these conditions is referred to as
a primary user of TEA2. The Confidentiality and Restricted Usage Undertaking (CRUU) in annex E applies to primary
and secondary users (see note 2). The TEA2 licence is required for the use of TEA2 in any element of the TETRA
network including TETRA Subscriber equipment (TETRA Mobile Station (MS)) where air interface encryption as
defined in EN 300 392-7 [i.1] or ETS 300 396-6 [i.2] is applied.
NOTE 1: Public safety organizations are e.g. Police, Fire brigade, Customs and Excise, Ambulance and Emergency
Medical Service, Coastguard.
NOTE 2: There may be more than one primary user in any allowed state and the number of primary users is a
national option.
ETSI

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10 ETSI TS 101 053-2 V2.3.1 (2014-04)
It is to be decided by the primary user of TEA2, who has received a TEA2 User Licence from the TEA2 Custodian,
which user organizations can use the above-mentioned network. This may be done on the basis of a sublicensing
procedure that may also be needed for the procurement of mobile terminals or movable equipment by a user or user
organization. An organization that obtains a TEA2 End User Licence under these conditions is referred to as an end user
of TEA2. The CRUU in annex F applies to end users.
A primary user can approve the use of TEA2 in a TETRA network owned by a military organization that is operational
in the same state or territory as the primary user. In the case where there is no primary user in that state or territory the
military organization has to demonstrate written approval to operate a TETRA network given by the governmental
organization that is responsible for public safety in its home state or territory. Such military organizations are referred to
as secondary users. The CRUU in annex E applies to secondary users. Again in these cases a TETRA network may
consist of fixed base stations and SwMI, all located in the home state or territory, and/or one or more base stations and
SwMIs that may also be used outside the home state or territory if both base stations and SwMIs are controlled from the
home state or territory. A military organization licensed as above may use its TEA2 network and terminal equipment in
connection with its deployment in any location outside of the TEA2 approved states and territories subject to the
permission of its primary user or governmental organization responsible for public safety, and the relevant export
authority. When so deployed the use of the network and associated equipment is limited to members of that military
organization and others associated with that deployment. The network and associated equipment must remain under the
management of the owning military organization who will remain responsible and liable under the terms and conditions
contained within the CRUU. Agreed standard operating procedures, including a strong and robust audit and accounting
process, must be in place. All network and associated equipment must be recovered upon completion of that
deployment.
NOTE 3: Primary and secondary users are expected to comply with the relevant national security policies
concerning the management and sub-licensing of TEA2.
5.2 TEA2 States and Territories
Organizations can be a primary or secondary user of TEA2 when it is based and (normally) operates in a state or
territory that is at least:
a) a Schengen state (see note 1);
b) a European Union state (see note 2);
c) a candidate European Union state (see note 3);
d) a dependent area of one of the Schengen or (candidate) European Union states (but not overseas (see note 4));
e) a state (but not overseas) that has a bilateral agreement with the European Union; or
f) a state that only has borders with TEA2 states or territories as in point a) through e).
NOTE 1: Including autonomous regions of that state that are also part of Schengen.
NOTE 2: Including autonomous regions of that state that are also part of the European Union.
NOTE 3: Including autonomous regions of that state that are also candidate part of the European Union.
NOTE 4: Overseas Countries and Territories as in Part Four of the Consolidated version of the Treaty establishing
the European Community (2002) plus French overseas territories (French Guyana, Guadeloupe,
Martinique, Réunion).
An exemplary list of TEA2 states and territories is provided in annex H. The TEA2 Custodian maintains the definitive
list of TEA2 states and territories.
ETSI

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11 ETSI TS 101 053-2 V2.3.1 (2014-04)
6 Licence types
6.1 Manufacturer Licence
An organization wishing to manufacture TETRA equipment and/or components containing TEA2 obtains its licence
and copies of the TEA2 specifications by the procedure defined in clause 7.1.
6.2 Installer/Repairer/Destruction Licence
An organization that installs hardware or software components containing TEA2 into equipment requires a
manufacturer licence (see clause 6.1) or an installer/repairer/destruction licence.
An organization that repairs equipment or hardware or software components containing TEA2 requires a manufacturer
licence or an installer/repairer/destruction licence.
An organization that destroys equipment or components containing TEA2 requires a manufacturer licence, an
installer/repairer/destruction licence or a destruction licence (see clause 6.7).
An organization that destroys computer software carriers containing TEA2 requires a manufacturer licence or an
installer/repairer/destruction licence.
A TETRA manufacturer that possesses a manufacturer licence may be permitted, subject to national legislation, to
nominate a third party to install TEA2 into equipment, to repair equipment and components containing TEA2 and to
destroy equipment, components and computer software carriers containing TEA2.
In this case, the TETRA manufacturer shall require the third party to sign two copies of the Confidentiality and
Restricted Usage Undertaking for installers, repairers and destruction of TEA2 (see annex C). The TETRA
manufacturer shall send these to the TEA2 Custodian together with a nomination letter signed by the manufacturer.
The TEA2 Custodian then enters the details in the TEA2 Register, countersigns the Confidentiality and Restricted
Usage Undertakings, returns one of these together with a covering letter to the TETRA manufacturer, and files the other
and a copy of the letter in the TEA2 File.
The TETRA manufacturer is responsible for passing (a copy of) the countersigned Confidentiality and Restricted Usage
Undertaking to the third party installer, repairer or destruction organization.
NOTE 1: The TEA2 Custodian will not sign the Confidentiality and Restricted Usage Undertaking for an
Installer/Repairer/Destruction Licence unless it is supported by a nomination letter signed by an
organization possessing a manufacturer's licence.
NOTE 2: The TETRA manufacturer is responsible for checking that the nominated Installer/Repairer/Desctruction
organization complies with the relevant national security policies (e.g. with regard to the removal of key
material).
NOTE 3: The TEA2 Custodian may check the suitability of the organization with respect to the relevant national
legislation before granting an Installer/Repairer/Destruction licence.
NOTE 4: An organization may be granted multiple Installer/Repairer/Destruction licences, each nominated by a
different manufacturer.
NOTE 5: If a manufacturer writes to the TEA2 Custodian withdrawing its nomination for an
Installer/Repairer/Destruction licence, the TEA2 Custodian will revoke that licence.
NOTE 6: This licence is not required by an organization that only handles complete radio equipment, e.g. for the
purpose of installation into a building or vehicle. (A supplier licence may be more suitable). This licence
is required by an organization that opens radio equipment for repair of components containing TEA2 or
installs executable code containing TEA2 into complete radio equipment.
NOTE 7: This licence is not required by an organization that only destroys equipment and components on behalf of
a user. (A destruction licence may be more suitable). This licence is required by an organization that
destroys computer software carriers.
ETSI

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12 ETSI TS 101 053-2 V2.3.1 (2014-04)
6.3 Supplier Licence
A TETRA manufacturer that has obtained a TEA2 manufacturer licence may be allowed, subject to national legislation,
to distribute TETRA equipment containing TEA2 via a supplier.
In this case, the TETRA manufacturer has to get the supplier to sign two copies of the Confidentiality and Restricted
Usage Undertaking for Suppliers (see annex D). The TETRA manufacturer then sends these to the TEA2 Custodian.
The TEA2 Custodian then enters the transfer details in the TEA2 Register, countersigns the Confidentiality and
Restricted Usage Undertakings, returns one of these together with a covering letter to the TETRA manufacturer, and
files the other and a copy of the letter in the TEA2 File.
The TETRA manufacturer is responsible for passing (a copy of) the countersigned Confidentiality and Restricted Usage
Undertaking to the supplier.
There may be a third party operator who is not a primary or secondary user, but who is supplying TETRA services with
TEA2 to primary and/or secondary users or end users.
In this case, the third party operator shall demonstrate to the TEA2 Custodian that he meets the approval criteria (see
clause 8.1) and shall send two signed copies of the Confidentiality and Restricted Usage Undertaking for Suppliers (see
annex D) to the TEA2 Custodian.
If the TEA2 Custodian is satisfied that the third party operator meets the approval criteria as listed in clause 8.1, the
TEA2 Custodian enters the transfer details in the TEA2 Register, countersigns the Confidentiality and Restricted Usage
Undertakings, returns one of these together with a covering letter to the third party operator, and files the other and a
copy of the letter in the TEA2 File.
NOTE: This licence is suitable for an organization that installs complete radio equipment into e.g. a building or
vehicle. It is not suitable for an organization that opens radio equipment for repair of components
containing TEA2 or installs executable code containing TEA2 into radio equipment.
6.4 Primary User Licence
The applicant for a primary user licence (see clause 5.1) of TETRA equipment containing TEA2 shall pr
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