ETSI TS 103 307 V1.1.1 (2016-04)

CYBER; Security Aspects for LI and RD Interfaces

DTS/CYBER-0005

General Information

• Status: Published
• Publication Date: 18-Apr-2016
• Technical Committee: CYBER - Cyber Security
• Current Stage: 12 - Completion
• Due Date: 26-Apr-2016
• Completion Date: 19-Apr-2016

Standards Content (Sample)

ETSI TS 103 307 V1.1.1 (2016-04)






TECHNICAL SPECIFICATION
CYBER;
Security Aspects for LI and RD Interfaces

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2 ETSI TS 103 307 V1.1.1 (2016-04)



Reference
DTS/CYBER-0005
Keywords
cyber security, lawful interception, retained data
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3 ETSI TS 103 307 V1.1.1 (2016-04)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definitions and abbreviations . 5
3.1 Definitions . 5
3.2 Abbreviations . 6
4 Structure of document and list of relevant interfaces . 6
4.1 Introduction . 6
4.2 List of LI and RD items covered in the present document . 6
5 Common techniques . 6
5.1 Introduction . 6
5.2 Hash algorithms . 7
Annex A (normative): Providing assurance for LI or RD material as evidence . 8
A.1 Statement of problem . 8
A.2 Techniques for providing assurance for LI or RD material as evidence . 8
A.2.1 Approaches to providing assurance . 8
A.2.2 Definition of two techniques . 9
A.3 Detailed definition for hash-only technique in the context of Retained Data . 9
A.3.1 Summary . 9
A.3.2 Terminology used in clause A.3 . 9
A.3.3 Processes and testing . 10
A.3.3.1 Process at CSP . 10
A.3.3.2 Process at any LEA systems handling the Evidence Data . 10
A.3.3.3 Process for use in court . 10
A.3.3.4 Recommended testing and assurance process at LEA Receiver . 10
A.3.4 Choice of hashing algorithms . 11
A.3.5 Meta-data required . 11
A.3.6 Associating hashes with the Evidence Data . 11
A.3.7 Storing information at the CSP . 12
A.3.8 Other notes . 12
History . 13

ETSI

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4 ETSI TS 103 307 V1.1.1 (2016-04)
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 (https://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 Cyber Security (CYBER).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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5 ETSI TS 103 307 V1.1.1 (2016-04)
1 Scope
The present document specifies security processes and techniques for LI and RD systems.
The present document is limited to the provision of evidential assurance of RD material.
Future versions of the present document will cover:
1) Assurance of the integrity and originator of approvals/authorizations.
2) Security aspects of internal interfaces for Lawful Interception.
3) Security issues around the role for global, trusted-third-party or virtualised components of Law Enforcement
equipment: Monitoring or Mediation facilities.
2 References
2.1 Normative 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
referenced 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.
The following referenced documents are necessary for the application of the present document.
[1] FIPS Publication 180-4 (2014): "Secure Hash Standard (SHS)".
2.2 Informative 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
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
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 TS 102 657: "Lawful Interception (LI); Retained data handling; Handover interface for the
request and delivery of retained data".
[i.2] ETSI TS 102 232-1: "Lawful Interception (LI); Handover Interface and Service-Specific Details
(SSD) for IP delivery; Part 1: Handover specification for IP delivery".
[i.3] ETSI TS 102 918: "Electronic Signatures and Infrastructures (ESI); Associated Signature
Containers (AsiC)".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in ETSI TS 102 657 [i.1] apply.
ETSI

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6 ETSI TS 103 307 V1.1.1 (2016-04)
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CSP Communications Service Provider
LI Lawful Interception
PDF Portable Document Format
RD Retained Data
SHA Secure Hash Algorithm
4 Structure of document and list of relevant interfaces
4.1 Introduction
The present document considers the list of particular information flows and interfaces for RD and LI specified in
clause 4.2. It examines them from a security (confidentiality, integrity and authenticity) perspective and specifies
implementation details (technologies, algorithms, options, minimum requirements on keys, etc. ).
An underlying reference model for LI is given in ETSI TS 102 232-1 [i.2] and an underlying reference model for RD is
given in ETSI TS 102 657 [i.1].
Certain techniques are applicable to more than one information flow or interface. Generic techniques are addressed in
clause 5.
For each information flow or interface, the present document contains the following information (where applicable):
- Statement of the problem, including reference model.
- Identification of the threats and risks to the extent it is appropriate to publish in a standard.
- Statement of the techniques which are recommended as a solution.
4.2 List of LI and RD items covered in the present document
The present document addresses the following LI and RD items:
1) Providing evidential assurance of LI or RD material (Annex A).
The following topics will be covered in future versions of the present document:
1) Assurance of the integrity and originator of approvals/authorizations.
2) Security aspects of internal interfaces for Lawful Interception.
3) Security issues around the role for global, trusted-third-party or virtualised components of Law Enforcement
equipment: Monitoring or Mediation facilities.
5 Common techniques
5.1 Introduction
The following techniques are used in a number of the annexes of the present document:
• Algorithms for hashing data.
The following techniques will be included in future versions of the present document:
• Digital signature algorithms.
• Procedures for Trusted timestamp.
• Transport-layer security
ETSI

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7 ETSI TS 103 307 V1.1.1 (2016-04)
5.2 Hash algorithms
The SHA-256 algorithm shall be as defined in FIPS Publication 180-4 [1].
The SHA-512 algorithm shall be as defined in FIPS Publication 180-4 [1].
ETSI

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8 ETSI TS 103 307 V1.1.1 (2016-04)
Annex A (normative):
Providing assurance for LI or RD material as evidence
A.1 Statement of problem
The requirement is to provide assurance about the integrity of the LI or RD material (i.e. to help with assurance that it
has not been altered during the course of delivery and/or storage with end user authorities) and to provide assurance
about the originator of the material (i.e. the organization that produced it). The present document does not look at any
requirement for confidentiality in this annex.
The goal of this clause is to add assurance to LI or RD material if it is presented as evidence in court. The present
document does not attempt to examine legal aspects and no assurance is given that the process in the present document
provides a complete or adequate level of assurance for any particular jurisdiction.
The reference model for this clause consists of two parties:
• The originator: the party that creates the material and wishes to provide assurance about its integrity and
origin.
• The receiver: the party that wishes to check the integrity and originator of the material.
In a typical situation:
• The originator is the CSP, and the information flow starts at the point where material is selected by the CSP
for use as RD or LI. The present document does not examine the integrity of existing CSP business records.
• The receiver is wherever there is a requirement to check the integrity and origin. This can includ
...