IEC TS 62351-100-3:2020

Power systems management and associated information exchange - Data and communications security - Part 100-3: Conformance test cases for the IEC 62351-3, the secure communication extension for profiles including TCP/IP

IEC 62351-100-3:2020, which is a technical specification, describes test cases of data and communication security for telecontrol equipment, Substation Automation Systems [SAS] and telecontrol systems, including front-end functions of SCADA.
The goal of this document is to enable interoperability by providing a standard method of testing protocol implementations to verify that a device fulfils the requirement of IEC 62351-3. Note that conformity to IEC 62351-3 does not guarantee interoperability between devices using different implementations. It is expected that using this specification during testing will minimize the risk of non-interoperability. A basic condition for this interoperability is a passed conformance test of both devices.
The scope of this document is the specification of common available procedures and definitions for conformance and/or interoperability testing to ensure conformity to IEC 62351-3. The conformance test cases defined here are focused to verify the conformant integration of the underlying authentication/encryption protocol (TLS), as specified in IEC 62351-3, to protect TCP/IP based communications.
This document is not intended to test the underlying authentication/encryption protocol required by IEC 62351-3 to be implemented over TCP/IP (TLS). The conformance testing of the authentication/encryption protocol over TCP/IP is outside the scope of this document.
This document deals with data and communication security conformance testing; therefore, other requirements, such as safety or EMC are not covered. These requirements are covered by other standards (if applicable) and the proof of compliance for these topics is done according to these standards.

Standards Content (sample)

IEC TS 62351-100-3
Edition 1.0 2020-01
TECHNICAL
SPECIFICATION
colour
inside
Power systems management and associated information exchange – Data and
communications security –
Part 100-3: Conformance test cases for IEC 62351-3, the secure communication
extension for profiles including TCP/IP
IEC TS 62351-100-3:2020-01(en)
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IEC TS 62351-100-3
Edition 1.0 2020-01
TECHNICAL
SPECIFICATION
colour
inside
Power systems management and associated information exchange – Data and
communications security –
Part 100-3: Conformance test cases for IEC 62351-3, the secure communication
extension for profiles including TCP/IP
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---------------------- Page: 3 ----------------------
– 2 – IEC TS 62351-100-3:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms, definitions and abbreviated terms ........................................................................ 7

3.1 Terms and definitions .............................................................................................. 7

3.2 Abbreviated terms ................................................................................................... 8

4 General ........................................................................................................................... 8

4.1 Normatives covered by this document ..................................................................... 8

4.2 Conformance testing structure ................................................................................ 9

4.2.1 General ........................................................................................................... 9

4.2.2 Conformance testing addressed per station type ............................................. 9

4.2.3 Normal procedure tests and resiliency tests ..................................................... 9

4.3 Conformance testing requirements ........................................................................ 10

4.3.1 Testing within the context of an application .................................................... 10

4.3.2 Requirements for the device under test.......................................................... 10

4.3.3 Requirements for the test facility ................................................................... 10

4.3.4 Test logging ................................................................................................... 11

5 Verification of Configuration parameters ........................................................................ 12

5.1 General ................................................................................................................. 12

5.2 Configuration parameters ...................................................................................... 12

6 Verification of IEC 62351-3 requirements....................................................................... 14

6.1 General ................................................................................................................. 14

6.2 Normal procedure test cases ................................................................................ 14

6.3 Resiliency test cases ............................................................................................ 17

7 Tests Results Chart ....................................................................................................... 22

7.1 Verification of Configuration Parameters ............................................................... 22

7.2 Verification of IEC 62351-3 requirements .............................................................. 23

Table 1 – Configuration Parameters ...................................................................................... 12

Table 2 – IEC 62351-3 requirements: Normal procedure tests .............................................. 14

Table 3 – IEC 62351-3 requirements: Resiliency tests .......................................................... 17

Table 4 – Test results chart: Verification of configuration parameters ................................... 22

Table 5 – Test results chart: Verification of IEC 62351-3 requirements ................................. 23

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IEC TS 62351-100-3:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER SYSTEMS MANAGEMENT AND ASSOCIATED INFORMATION
EXCHANGE – DATA AND COMMUNICATIONS SECURITY –
Part 100-3: Conformance test cases for IEC 62351-3, the secure
communication extension for profiles including TCP/IP
FOREWORD

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Technical specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 62351-100-3, which is a technical specification, has been prepared by IEC technical

committee 57: Power systems management and associated information exchange.
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– 4 – IEC TS 62351-100-3:2020 © IEC 2020
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
57/2090/DTS 57/2130/RVDTS

Full information on the voting for the approval of this technical specification can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

This document is to be read in conjunction with IEC 62351-3:2014, IEC 62351-3/AMD1:2018

and IEC 62351-3/AMD2:2020.

A list of all parts in the IEC 62351 series, published under the general title Power systems

management and associated information exchange – Data and communications security, can

be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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IEC TS 62351-100-3:2020 © IEC 2020 – 5 –
INTRODUCTION

This technical specification describes test cases for conformance testing of telecontrol

equipment or systems integrating the IEC 62351-3 security extension for profiles including

TCP/IP.
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– 6 – IEC TS 62351-100-3:2020 © IEC 2020
POWER SYSTEMS MANAGEMENT AND ASSOCIATED INFORMATION
EXCHANGE – DATA AND COMMUNICATIONS SECURITY –
Part 100-3: Conformance test cases for IEC 62351-3, the secure
communication extension for profiles including TCP/IP
1 Scope

This part of IEC 62351, which is a technical specification, describes test cases of data and

communication security for telecontrol equipment, Substation Automation Systems [SAS] and

telecontrol systems, including front-end functions of SCADA.

The goal of this document is to enable interoperability by providing a standard method of

testing protocol implementations to verify that a device fulfils the requirement of IEC 62351-3.

Note that conformity to IEC 62351-3 does not guarantee interoperability between devices

using different implementations. It is expected that using this specification during testing will

minimize the risk of non-interoperability. A basic condition for this interoperability is a passed

conformance test of both devices.

The scope of this document is the specification of common available procedures and

definitions for conformance and/or interoperability testing to ensure conformity to

IEC 62351-3. The conformance test cases defined here are focused to verify the conformant

integration of the underlying authentication/encryption protocol (TLS), as specified in

IEC 62351-3, to protect TCP/IP based communications.

This document is not intended to test the underlying authentication/encryption protocol

required by IEC 62351-3 to be implemented over TCP/IP (TLS). The conformance testing of

the authentication/encryption protocol over TCP/IP is outside the scope of this document.

This document deals with data and communication security conformance testing; therefore,

other requirements, such as safety or EMC are not covered. These requirements are covered

by other standards (if applicable) and the proof of compliance for these topics is done

according to these standards.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC TS 62351-2:2008, Power systems management and associated information exchange -

Data and communications security - Part 2: Glossary of terms

IEC 62351-3:2014, Power systems management and associated information exchange – Data

and communications security – Part 3: Communication network and system security – Profiles

—————————

The base standard always takes precedence. In case of ambiguity between this technical specification and the

base standards (IEC 62351-3), this part of IEC 62351 needs to be clarified or amended.

When testing, negative behavior is not described in the base standard, the behavior described in this document

prevails and should be observed. The conformance statement produced after testing indicates any lack of

conformance to either the test plan or the base standard.
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IEC TS 62351-100-3:2020 © IEC 2020 – 7 –
including TCP/IP
IEC 62351-3:2014/AMD1:2018, IEC 62351-3:2014/AMD2:2019
3 Terms, definitions and abbreviated terms

For the purposes of this document, the terms and definitions given in IEC TS 62351-2 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Terms and definitions
3.1.1
client
device receiving or requesting services or information from server devices

Note 1 to entry: In some specifications, a device is commonly called "controlling station" or "master" or "master

station".
3.1.2
interoperability

ability of two or more telecontrol devices from the same vendor, or different vendors, to

exchange information and use that information for correct cooperation
3.1.3
Message Authentication Code (MAC)

calculated value used by a receiving station to authenticate and check the integrity of an

information
3.1.4
normal procedure tests

set of test cases to verify that the device fulfils the requirements of IEC 62351-3 in the

expected (normal) conditions
3.1.5
Protocol Implementation Conformance Statement (PICS)
summary of the referencing standard capabilities of the system to be tested
3.1.6
Protocol Implementation Document (PID)

document which describes complete functionalities and system specific information

Note 1 to entry: The PID consists of the PICS and the PIXIT.
3.1.7
protocol Implementation eXtra Information for Testing (PIXIT)

system specific information contained in the PIXIT document regarding the capabilities of the

system to be tested, which specifies which items are optional
3.1.8
resiliency tests

set of test cases to verify that the device fulfils the requirements of IEC 62351-3 in reacting to

the unexpected (error) conditions
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3.1.9
server
device that provides information or services to client devices

Note 1 to entry: In some specifications, a server is commonly called "controlled station" or "outstation" or "slave".

3.1.10
test equipment

all tools and instruments which simulate and verify the communication traffic, inputs and/or

outputs of the system under test
3.1.11
test initiator

party initiating a conformance test of a device that is executed by a test facility

3.1.12
test facility

supplier-independent organization which is able to provide appropriate test equipment and

trained staff for conformance testing
3.2 Abbreviated terms

Refer to IEC 62351-2 for a list of applicable abbreviated terms. The abbreviations listed below

are included here because they are specific to IEC 62351-3 and they may be useful for

reading this document as an independent document.
CRL Certificate Revocation List
DUT Device Under Test
IP Inter-Networking Protocol
MAC Message Authentication Code
OCSP Online Certificate Status Protocol
PICS Protocol Implementation Conformance Statement
PID Protocol Implementation Document (=PICS + PIXIT)
PIXIT Protocol Implementation eXtra Information for Testing
SAS Substation Automation System
SCADA Supervisory Control And Data Acquisition
TCP Transport Control Protocol
4 General
4.1 Normatives covered by this document
This document defines the conformance test cases for the requirements defined in
IEC 62351-3:2014, IEC 62351-3:2014/AMD1:2018, IEC 62351-3:2014/AMD2:2019 and the
parts of the series requiring conformance to IEC 62351-3.

In addition to the test cases described in this document there are further test cases necessary

for TLS base protocol RFC as well as test cases depending on the content provided in the

certificates. An example may be the RBAC extension specified in IEC 62351-8 or certificate

profiles defined in IEC 62351-9.
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IEC TS 62351-100-3:2020 © IEC 2020 – 9 –
4.2 Conformance testing structure
4.2.1 General

IEC 62351-3 defines the requirements related to the authentication/encryption protocol,

procedures and methods to be implemented at TCP/IP (transport) level.
The conformance test cases are divided into three clauses:

• Clause 5: Verification of configuration parameters. This clause contains the parameters

specified by the standards referencing IEC 62351-3 (see IEC 62351-3:2014/AMD1:2018,

Clause 7) and affecting the protocol behavior.

• Clause 6: Verification of IEC 62351-3 requirements. The goal of this clause is to verify that

DUT is conformant to the requirements of the IEC 62351-3.

• Clause 7: Test result chart. This clause contains the results of the test cases listed in

Clause 6 for each supported value of the configuration parameters listed in Clause 5.

The test cases are organized in tables. They are numbered, their numbering syntax is:

Subclause number (where the table is located) + test case number.

In the column ‘Reference’ each test case has a direct reference to IEC 62351-3 where the

clause under test is defined. PICS or PIXIT could be found in the “Reference” column for

some test cases whenever the execution of the test case shall take into account specific

parameter values declared in the PICS or PIXIT of the DUT.

Test cases are mandatory depending on the description in the column ‘Required’. The

following situations are possible:

M = Mandatory test case. The test is referencing to a clause that is mandatory in

IEC 62351-3.
PICS

PIXIT = Mandatory test case if the functionality is enabled in the PICS or PIXIT by marking

the applicable check box or declaring the applicable value.
4.2.2 Conformance testing addressed per station type

The test cases in Clause 6 to verify the requirements defined in IEC 62351-3 are addressed

per station type (client and server).
4.2.3 Normal procedure tests and resiliency tests

IEC 62351-3 specifies how each station (client and server) shall execute the procedures in

normal conditions (expected behavior) and also how it shall behave when unexpected or fault

events occur during their execution (negative behaviors). So, for each procedure in Clause 6

the test cases are also divided in two sections: the normal procedures test cases addressing

the expected behaviors and the resiliency test cases addressing unexpected or fault events.

Normal Procedure tests and Resiliency tests shall be performed according to the parameters

values supported by the DUT as defined in Clause 6, declared in the PICS and in the PIXIT of

the DUT.

All the tests defined in this technical specification shall be executed for client stations and

server stations unless otherwise specified in the test cases.
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4.3 Conformance testing requirements
4.3.1 Testing within the context of an application

The test cases listed in this document shall be executed within the context of an application.

The DUT claiming conformance to IEC 62351-3 shall execute an application protocol defined

in a standard requiring conformance to IEC 62351-3.
4.3.2 Requirements for the device under test
The entity submitting the device for testing shall provide the following:
a) The device ready for testing;
b) The Protocol Implementation Document (PID);

c) Instruction manuals detailing the installation and operation of the device or assistance for

operating the DUT during the test.
A device is ready for testing when the following requisites are satisfied:

d) The DUT is able to operate as a client or server station according to the PID (depending

on the type of DUT).

e) The DUT must be fully configured according to the PID and shall be able to execute all the

functionality of the protocol implementation as described in the PID.

f) The functionality described in the PID related to data points such as parameter loading,

read procedure, command transmission, etc. is implemented with a representative sub-set

of data points.

g) Verification of the data points shall be possible in a human readable way or format, and

the verification of analogue and digital status changes is possible.
4.3.3 Requirements for the test facility
The following requirements shall be satisfied by the test facility:
The documentation provided with the DUT shall be inspected for correctness and

completeness. Also, the software and hardware versions of the DUT shall be verified.

• Conformance testing shall be customized for the DUT based on the capabilities identified

in the PID (=PICS+PIXIT). Upon this customization, the test facility shall communicate

what the tailored test plan will cover.

• The test cases listed in Clauses 5 and 6 shall be performed with no errors detected during

testing.

• The test cases in Clause 6 should be performed in the order listed and the steps in each

test case shall be followed, which means that the DUT is able to function as described in

the specific test case.

• For each test case listed in Clauses 5 and 6 the test results need to be marked in the

appropriate column of the test result chart in Clause 7. Each test case can either pass

(Passed), or fail (Failed), or be not applicable (NA) when the configuration value is not

supported by the device, or the test case cannot be performed (Empty). Ideally, there

should be no empty boxes when the conformance testing is completed.
• Release a conformance test report of the DUT to the test initiator.

All test cases listed in Clause 7 should be verified automatically by a testing software or

verified manually by review of the test history log after execution of the test procedures. The

simulator is preferably flexible in adding or changing test cases in order to be adaptable to

changes in the protocol standard and the PID provided with the DUT. In all cases, the test

shall be reproducible over time by test engineers in the test facility.
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IEC TS 62351-100-3:2020 © IEC 2020 – 11 –

In operational use, the device may show communication and/or behavior errors, which forces

the supplier to reproduce the complete conformance test (for example for verification

afterwards) or for reproducing only the tests that were shown to have errors.

The test focuses only on the protocol elements and functions as described in the PID; the test

does not include the application logic and the operation of the tested system.
4.3.4 Test logging

During the execution of conformance testing the following information should be logged by the

DUT in a readable format for test results analysis:

• communication events (first handshake, session renegotiation, session resumption);

• certificate check results (e.g. valid, expired, revoked, invalid key length, invalid signature);

• change cipher result (e.g. unsupported).

• The security events raised by the DUT (defined in IEC 62351-3) whenever a negative

behavior occurs while performing resiliency tests.

If the specific test logging defined herein and IEC 62351-3 is not supported by the DUT, the

DUT shall provide the means by which the tester can verify the proper execution of the test

cases.
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5 Verification of Configuration parameters
5.1 General

The scope of this clause is to verify the configuration of all the parameters that affect security extension procedures and protocol behavior so that

the whole or part of conformance testing shall be executed (and the tests result chart in Clause 7 shall be filled accordingly) for each value of these

parameters as indicated in 5.2. Basically, the DUT must be tested to verify that the whole functionality and behavior are correct according to the

configuration(s) defined in Table 1.
5.2 Configuration parameters
Table 1 – Configuration Parameters
No. Test Definition Reference Required
5.2.1 Station Type Client, Server PICS M

All conformance tests listed in Clause 6 shall be performed for each station type supported.

5.2.2 TCP IP Port to be All conformance tests listed in Clause 6 shall be performed for the value of this parameter. IEC 62351-3:2014, Clause 7 M

used for secure
PICS
communication
5.2.3 TLS Versions TLS protocol versions supported. IEC 62351-3:2014, 5.2 M
PICS, PIXIT

All conformance tests listed in Clause 6 shall be performed for each value (mandatory and optional)

supported in this parameter.

5.2.4 TLS Cipher Suites Set of cipher suites supported in TLS protocol. IEC 62351-3:2014, Clause 7 M

PICS, PIXIT

All conformance tests listed in Clause 6 shall be performed at least for the minimum mandatory value

supported in this parameter.
5.2.5 Public Key Lengths Public Key lengths supported in certific
...