Power systems management and associated information exchange - Data and communications security - Part 6: Security for IEC 61850

This part of IEC 62351 specifies messages, procedures, and algorithms for securing the
operation of all protocols based on or derived from the IEC 61850 series.The initial audience for this document is intended to be the members of the working groups
developing or making use of the protocols listed in Table 1. For the measures described in this
specification to take effect, they must be accepted and referenced by the specifications for the
protocols themselves. This document is written to enable that process.
The subsequent audience for this document is intended to be the developers of products that
implement these protocols.
Portions of this document may also be of use to managers and executives in order to understand
the purpose and requirements of the work.

Energiemanagementsysteme und zugehöriger Datenaustausch - IT-Sicherheit für Daten und Kommunikation - Teil 6: Sicherheit für IEC 61850

Gestion des systèmes de puissance et échanges d'informations associés - Sécurité des communications et des données - Partie 6: Sécurité pour l'IEC 61850

IEC 62351-6:2020 spécifie les messages, procédures et algorithmes qui permettent de sécuriser le fonctionnement de tous les protocoles fondés sur ou dérivés de la série IEC 61850. Les premiers utilisateurs auxquels s’adresse le présent document sont les membres des groupes de travail qui développent ou utilisent les protocoles répertoriés dans le Tableau 1. Pour que les mesures décrites dans la présente spécification soient mises en œuvre, elles doivent être acceptées et référencées dans les spécifications des protocoles elles-mêmes. Le présent document est rédigé afin de permettre ce traitement. Les premiers utilisateurs auxquels s’adresse le présent document sont présumés être les concepteurs de produits qui mettent en œuvre ces protocoles. Des parties du présent document peuvent aussi être utiles aux gestionnaires et aux dirigeants pour comprendre l'objectif d’une activité et les exigences correspondantes.

Upravljanje elektroenergetskega sistema in pripadajoča izmenjava informacij - Varnost podatkov in komunikacij - 6. del: Varnost za IEC 61850

General Information

Status
Published
Publication Date
20-Jan-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Jan-2021
Due Date
14-Mar-2021
Completion Date
21-Jan-2021

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SLOVENSKI STANDARD
SIST EN IEC 62351-6:2021
01-februar-2021
Upravljanje elektroenergetskega sistema in pripadajoča izmenjava informacij -
Varnost podatkov in komunikacij - 6. del: Varnost za IEC 61850
Power systems management and associated information exchange - Data and
communications security - Part 6: Security for IEC 61850
Ta slovenski standard je istoveten z: EN IEC 62351-6:2020
ICS:
29.240.30 Krmilna oprema za Control equipment for electric
elektroenergetske sisteme power systems
35.240.50 Uporabniške rešitve IT v IT applications in industry
industriji
SIST EN IEC 62351-6:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 62351-6:2021
---------------------- Page: 2 ----------------------
SIST EN IEC 62351-6:2021
EUROPEAN STANDARD EN IEC 62351-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2020
ICS 33.200
English Version
Power systems management and associated information
exchange - Data and communications security - Part 6: Security
for IEC 61850
(IEC 62351-6:2020)

Gestion des systèmes de puissance et échanges Energiemanagementsysteme und zugehöriger

d'informations associés - Sécurité des communications et Datenaustausch - IT-Sicherheit für Daten und

des données - Partie 6: Sécurité pour l'IEC 61850 Kommunikation - Teil 6: Sicherheit für IEC 61850

(IEC 62351-6:2020) (IEC 62351-6:2020)

This European Standard was approved by CENELEC on 2020-11-24. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62351-6:2020 E
---------------------- Page: 3 ----------------------
SIST EN IEC 62351-6:2021
EN IEC 62351-6:2020 (E)
European foreword

The text of document 57/2234/FDIS, future edition 1 of IEC 62351-6, prepared by IEC/TC 57 "Power

systems management and associated information exchange" was submitted to the IEC-CENELEC

parallel vote and approved by CENELEC as EN IEC 62351-6:2020.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-08-24

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2023-11-24

document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 62351-6:2020 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 62351-3 NOTE Harmonized as EN 62351-3
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SIST EN IEC 62351-6:2021
EN IEC 62351-6:2020 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),

the relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available

here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61850-6 - Communication networks and systems for EN 61850-6 -
power utility automation - Part 6:
Configuration description language for
communication in electrical substations
related to IEDs
IEC 61850-7-3 - Communication networks and systems for EN 61850-7-3 -
power utility automation - Part 7-3: Basic
communication structure - Common data
classes
IEC 61850-8-1 - Communication networks and systems for EN 61850-8-1 -
power utility automation - Part 8-1:
Specific communication service mapping
(SCSM) - Mappings to MMS (ISO 9506-1
and ISO 9506-2) and to ISO/IEC 8802-3
IEC 61850-8-2 - Communication networks and systems for EN IEC 61850-8-2 -
power utility automation - Part 8-2:
Specific communication service mapping
(SCSM) - Mapping to Extensible
Messaging Presence Protocol (XMPP)
IEC 61850-9-2 - Communication networks and systems for EN 61850-9-2 -
power utility automation - Part 9-2:
Specific communication service mapping
(SCSM) - Sampled values over ISO/IEC
8802-3
IEC/TS 62351-1 - Power systems management and - -
associated information exchange - Data
and communications security - Part 1:
Communication network and system
security - Introduction to security issues
---------------------- Page: 5 ----------------------
SIST EN IEC 62351-6:2021
EN IEC 62351-6:2020 (E)
Publication Year Title EN/HD Year
IEC/TS 62351-2 - Power systems management and - -
associated information exchange - Data
and communications security - Part 2:
Glossary of terms
IEC 62351-4 2020 Power systems management and - -
associated information exchange - Data
and communications security - Part 4:
Profiles including MMS and derivatives
IEC 62351-9 - Power systems management and EN 62351-9 -
associated information exchange - Data
and communications security - Part 9:
Cyber security key management for
power system equipment
ISO/IEC 13239 - Information technology - - -
Telecommunications and information
exchange between systems - High-level
data link control (HDLC) procedures
ISO/IEC 9594-8 | - Information technology - Open Systems - -
Rec. ITU-T X.509 Interconnection - The Directory - Part 8:
Public-key and attribute certificate
frameworks
RFC 2104 - HMAC: Keyed-Hashing for Message - -
Authentication
RFC 5905 - Network Time Protocol Version 4: - -
Protocol and Algorithms Specification
RFC 8052 - Group Domain of Interpretation (GDOI) - -
Protocol Support for IEC 62351 Security
Services
NIST SP 800-38D - Recommendation for Block Cipher Modes - -
of Operation - Galois/Counter Mode
(GCM) and GMAC
Restricted to SNTP profile only.
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SIST EN IEC 62351-6:2021
IEC 62351-6
Edition 1.0 2020-10
INTERNATIONAL
STANDARD
colour
inside
Power systems management and associated information exchange –
Data and communication security –
Part 6: Security for IEC 61850
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.200 ISBN 978-2-8322-8766-8

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 7 ----------------------
SIST EN IEC 62351-6:2021
– 2 – IEC 62351-6:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope and object ............................................................................................................. 6

1.1 Scope ..................................................................................................................... 6

1.2 Namespace name and version ................................................................................ 6

1.3 Code Component distribution .................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms, definitions and abbreviated terms ........................................................................ 8

3.1 Terms and definitions .............................................................................................. 8

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

4 Security issues addressed by this document .................................................................... 9

4.1 Operational issues affecting choice of security options ........................................... 9

4.2 Security threats countered ...................................................................................... 9

4.3 Attack methods countered ....................................................................................... 9

5 Correlation of IEC 61850 parts and IEC 62351 parts ........................................................ 9

5.1 General ................................................................................................................... 9

5.2 IEC 61850-8-1 Profile for Client/Server communications ....................................... 10

5.2.1 General ......................................................................................................... 10

5.2.2 Control centre to substation ........................................................................... 11

5.2.3 Substation communications ........................................................................... 11

5.3 IEC 61850 security for profiles using VLAN IDs ..................................................... 11

5.4 IEC 61850-8-2 for Client/Server communications .................................................. 11

5.5 Using OriginatorID for Client/Server Services........................................................ 11

6 Multicast Association Protocols ..................................................................................... 12

6.1 General ................................................................................................................. 12

6.2 Replay Protection ................................................................................................. 12

6.2.1 GOOSE replay protection .............................................................................. 12

6.2.2 Sampled Value replay protection ................................................................... 16

7 Security for SNTP .......................................................................................................... 19

8 Layer 2 security for profiles for IEC 61850-8-1 GOOSE and IEC 61850-9-2

Sampled Value .............................................................................................................. 20

8.1 Overview of Ethertype (informative) ...................................................................... 20

8.2 Extended PDU ...................................................................................................... 20

8.2.1 General format of extended PDU ................................................................... 20

8.2.2 Format of extension octets ............................................................................. 21

9 Substation configuration language extensions ............................................................... 25

9.1 Service capability .................................................................................................. 25

9.1.1 Access Point support security for GOOSE Publisher ...................................... 25

9.1.2 Access Point support security for SV Publisher .............................................. 25

9.1.3 Acces Point support security for GOOSE and SMV subscriber ....................... 25

9.1.4 Server Access Point support security for TPAA .............................................. 26

9.1.5 Client Access Point support security for TPAA ............................................... 26

9.2 Publish with security enabled ................................................................................ 26

9.2.1 GOOSE ......................................................................................................... 26

9.2.2 SMV .............................................................................................................. 26

9.2.3 Key Policy and Management .......................................................................... 27

9.3 Use of Simulation .................................................................................................. 27

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SIST EN IEC 62351-6:2021
IEC 62351-6:2020 © IEC 2020 – 3 –

10 Extension of LGOS and LSVS ....................................................................................... 27

11 Conformance ................................................................................................................. 27

11.1 General conformance ............................................................................................ 27

11.2 Conformance for implementations claiming IEC 61850-8-1 ISO 9506 profile

security ................................................................................................................. 28

11.2.1 General ......................................................................................................... 28

11.2.2 IEC 62351-4 TLS Conformity for ISO-9506 Client/Server Profile using

ACSE Authentication ..................................................................................... 29

11.3 Conformance for implementations claiming VLAN profile security ......................... 29

11.4 Conformance for implementations claiming SNTP profile security ......................... 32

Bibliography .......................................................................................................................... 33

Figure 1 – MMS Security Profiles .......................................................................................... 10

Figure 2 – Replay Protection State Machine for GOOSE ....................................................... 13

Figure 3 – Replay Protection State Machine for SV ............................................................... 17

Figure 4 – General format of extended PDU .......................................................................... 20

Figure 5 – Definition of Reserved 1 ....................................................................................... 20

Figure 6 – Calculated MAC Domain ...................................................................................... 22

Figure 7 – AES-GCM application on the example of a L2 GOOSE/SV packet. ....................... 23

Table 1 – Scope of application to standards ............................................................................ 6

Table 2 – Extract from IEC 61850-9-2 (Informative) .............................................................. 16

Table 3 – Extension of the LGOS class ................................................................................. 27

Table 4 – Extension of the LSVS class .................................................................................. 27

Table 5 – Conformance table ................................................................................................ 28

Table 6 – PICS for IEC 61850-8-1 ISO 9506 profile .............................................................. 28

Table 7 – PICS for TLS IEC 61850-8-1 Client/Server using ACSE Authentication ................. 29

Table 8 – PICS for VLAN profiles .......................................................................................... 30

Table 9 – IEC 61850-8-1 L2 GOOSE Security ....................................................................... 30

Table 10 – IEC 61850-9-2 L2 SMV Security .......................................................................... 31

Table 11 – IEC 61850-8-1 Routable GOOSE ......................................................................... 31

Table 12 – IEC 61850-9-2 Routable SMV .............................................................................. 32

Table 13 – PICS for SNTP profiles ........................................................................................ 32

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SIST EN IEC 62351-6:2021
– 4 – IEC 62351-6:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER SYSTEMS MANAGEMENT AND ASSOCIATED INFORMATION
EXCHANGE – DATA AND COMMUNICATION SECURITY –
Part 6: Security for IEC 61850
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62351-6 has been prepared by IEC technical committee 57: Power

systems management and associated information exchange.
The text of this International Standard is based on the following documents:
FDIS Report on voting
57/2234/FDIS 57/2258/RVD

Full information on the voting for the approval of this International Standard 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.

A list of all parts of 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.
---------------------- Page: 10 ----------------------
SIST EN IEC 62351-6:2021
IEC 62351-6:2020 © IEC 2020 – 5 –

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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 11 ----------------------
SIST EN IEC 62351-6:2021
– 6 – IEC 62351-6:2020 © IEC 2020
POWER SYSTEMS MANAGEMENT AND ASSOCIATED INFORMATION
EXCHANGE – DATA AND COMMUNICATION SECURITY –
Part 6: Security for IEC 61850
1 Scope and object
1.1 Scope

This part of IEC 62351 specifies messages, procedures, and algorithms for securing the

operation of all protocols based on or derived from the IEC 61850 series. This document applies

to at least those protocols listed in Table 1.
Table 1 – Scope of application to standards
Number Name

IEC 61850-8-1 Communication networks and systems for power utility automation – Part 8-1: Specific

communication service mapping (SCSM) – Mappings to MMS (ISO/IEC 9506-1 and
ISO/IEC 9506-2) and to ISO/IEC 8802-3

IEC 61850-8-2 Communication networks and systems for power utility automation – Part 8-2: Specific

communication service mapping (SCSM) – Mapping to Extensible Messaging Presence
Protocol (XMPP)

IEC 61850-9-2 Communication networks and systems for power utility automation – Part 9-2: Specific

communication service mapping (SCSM) – Sampled values over ISO/IEC 8802-3

IEC 61850-6 Communication networks and systems for power utility automation – Part 6: Configuration

description language for communication in power utility automation systems related to

IEDs

The initial audience for this document is intended to be the members of the working groups

developing or making use of the protocols listed in Table 1. For the measures described in this

specification to take effect, they must be accepted and referenced by the specifications for the

protocols themselves. This document is written to enable that process.

The subsequent audience for this document is intended to be the developers of products that

implement these protocols.

Portions of this document may also be of use to managers and executives in order to understand

the purpose and requirements of the work.
1.2 Namespace name and version

This new clause is mandatory for any IEC 61850 namespace (as defined by part 7-1 of

IEC 61850 Edition 2).
The parameters which identify this new release of this namespace are:
• Namespace version: 2020
• Namespace revision: A
• Namespace name: “IEC 62351-6:2020A”
• Namespace release: 1

The table below provides an overview of all published versions of this namespace.

---------------------- Page: 12 ----------------------
SIST EN IEC 62351-6:2021
IEC 62351-6:2020 © IEC 2020 – 7 –
Edition Publication date Webstore Namespace
Edition 1.0 2020-? IEC 62351-6:2020 IEC 62351-6:2020
1.3 Code Component distribution

There is currently no code component scheduled for the code component downloading area.

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 61850-6, Communication networks and systems for power utility automation – Part 6:

Configuration description language for communication in electrical substations related to IEDs

IEC 61850-7-3, Communication networks and systems for power utility automation – Part 7-3:

Basic communication structure – Common data classes
IEC 61850-8-1, Communication networks and systems for power utility automation –

Part 8-1: Specific communication service mapping (SCSM) – Mappings to MMS (ISO 9506-1

and ISO 9506-2) and to ISO/IEC 8802-3

IEC 61850-8-2, Communication networks and systems for power utility automation – Part 8-2:

Specific communication service mapping (SCSM) – Mapping to Extensible Messaging Presence

Protocol (XMPP)

IEC 61850-9-2, Communication networks and systems for power utility automation – Part 9-2:

Specific communication service mapping (SCSM) – Sampled values over ISO/IEC 8802-3

IEC TS 62351-1, Power systems management and associated information exchange – Data

and communications security – Part 1: Communication network and system security –

Introduction to security issues

IEC TS 62351-2, Power systems management and associated information exchange – Data

and communications security – Part 2: Glossary of terms

IEC 62351-4:2020, Power systems management and associated information exchange – Data

and communications security – Part 4: Profiles including MMS and derivatives

IEC 62351-9, Power systems management and associated information exchange – Data and

communications security – Part 9: Cyber security key management for power system equipment

ISO/IEC 13239, Information technology – Telecommunications and information exchange

between systems – High-level data link control (HDLC) procedures

ISO/IEC 9594-8 | Rec. ITU-T X.509: Information technology – Open Systems Interconnection –

The Directory: Public-key and attribute certificate frameworks
RFC 2104, HMAC: Keyed-Hashing for Message Authentication
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SIST EN IEC 62351-6:2021
– 8 – IEC 62351-6:2020 © IEC 2020
RFC 5905, Network Time Protocol Version 4: Protocol and Algorithms Specification

RFC 8052, Group Domain of Interpretation (GDOI) Protocol Support for IEC 62351 Security

Services

NIST Special Publication 800-38D, Recommendation for Block Cipher Modes of Operation

Galois/Counter Mode (GCM and GMAC)
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions

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

IEC 61850-2 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
3.1.1
electronic security perimeter
logical border surrounding a network interconnecting critical cyber assets
3.1.2
client

functional unit that establishes an association and issues requests and receives services from

a server.
3.1.3
server

functional unit that receives an association from a Client and provides services requested by

the Client
3.2 Abbreviated terms
ACSE Association Control Service Element
APDU Application Protocol Data Unit
ASDU Application Service Data Unit
ASN.1 Abstract Syntax Notation One
ESP Electronic Security Perimeter
GDOI Group Domain of Interpretation
GMAC Galois Message Authentication Code
GOOSE Generic Object Oriented Substation Event
GSE Generic Substation Events
HMAC Hashed Message Authentication Code
ICT IED Configuration Tool
IED Intelligent Electronic Device
KFA Key Delivery Assurance
KDC Key Distribution Centre
___________
Restricted to SNTP profile only.
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SIST EN IEC 62351-6:2021
IEC 62351-6:2020 © IEC 2020 – 9 –
MAC Message Authentication Code
SMV Sampled Measured Values
SCL Substation Configuration Language
SV Sampled Value
4 Security issues addressed by this document
4.1 Operational issues affecting choice of security options

For applications using Layer 2 IEC 61850-8-1 GOOSE and Layer 2 IEC 61850-9-2 Sampled

Value and requiring 3 ms response times, multicast configurations and low CPU overhead,

encryption is no
...

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