IEC TS 62351-2:2008

Power systems management and associated information exchange - Data and communications security - Part 2: Glossary of terms

IEC 62351-2:2008 (E) covers the key terms used in the IEC 62351 series, and is not meant to be a definitive list. Most terms used for cyber security are formally defined by other standards organizations, and so are included here with references to where they were originally defined.
This publication is of core relevance for Smart Grid.

General Information

• Status: Published
• Publication Date: 18-Aug-2008
• ICS: 33.200 - Telecontrol. Telemetering
• Technical Committee: TC 57 - Power systems management and associated information exchange
• Drafting Committee: WG 15 - TC 57/WG 15
• Current Stage: PPUB - Publication issued
• Start Date: 19-Aug-2008
• Completion Date: 15-Aug-2008

Standards Content (Sample)

IEC/TS 62351-2
Edition 1.0 2008-08
TECHNICAL
SPECIFICATION
Power systems management and associated information exchange – Data and
communications security –
Part 2: Glossary of terms
IEC/TS 62351-2:2008(E)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

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IEC/TS 62351-2
Edition 1.0 2008-08
TECHNICAL
SPECIFICATION
Power systems management and associated information exchange – Data and
communications security –
Part 2: Glossary of terms
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XA
ICS 33.200 ISBN 2-8318-9956-7
– 2 – TS 62351-2 © IEC:2008(E)

CONTENTS
FOREWORD.9
1 Scope and object.11
2 Terms and definitions .11
2.1 Glossary references and permissions .11
2.2 Glossary of security and related communication terms .13
2.2.1 Abstract Communication Service Interface (ACSI).13
2.2.2 Access .13
2.2.3 Access Authority .13
2.2.4 Access Control.13
2.2.5 Access Control List (ACL) .13
2.2.6 Accountability .13
2.2.7 Adequate Security.13
2.2.8 Advanced Encryption Standard (AES) .14
2.2.9 Alarm .14
2.2.10 Application Layer .14
2.2.11 Association .14
2.2.12 Assurance.14
2.2.13 Asymmetric Cipher.14
2.2.14 Asymmetric Cryptography .14
2.2.15 Asymmetric Key Pair.14
2.2.16 Attack .14
2.2.17 Audit .15
2.2.18 Audit Log .15
2.2.19 Audit Record Field .15
2.2.20 Audit Trail .15
2.2.21 Authentic Signature.15
2.2.22 Authentication.15
2.2.23 Authorization.15
2.2.24 Authorization Process .15
2.2.25 Authorized User .16
2.2.26 Availability .16
2.2.27 Back Door .16
2.2.28 Bandwidth.16
2.2.29 Biometric .16
2.2.30 Block Cipher .16
2.2.31 Boundary Protection.16
2.2.32 Buffer Overflow .16
2.2.33 Bump-in-the-Stack .17
2.2.34 Bump-in-the-Wire.17
2.2.35 Call Back .17
2.2.36 Certificate .17
2.2.37 Certificate Management .17
2.2.38 Certificate Revocation List (CRL) .17
2.2.39 Certification .17
2.2.40 Certification Authority (CA) .18

TS 62351-2 © IEC:2008(E) – 3 –

2.2.41 Chain of Custody .18
2.2.42 Challenge Handshake Authentication Protocol (CHAP) .18
2.2.43 Challenge-Response, Challenge-Response Protocol.18
2.2.44 Checksum.18
2.2.45 Cipher.18
2.2.46 Ciphertext .19
2.2.47 Cleartext .19
2.2.48 Client .19
2.2.49 Compromise.19
2.2.50 Computer Emergency Response Team (CERT).19
2.2.51 Computer Virus .19
2.2.52 Confidentiality .19
2.2.53 Conformance Test.19
2.2.54 Control Network .20
2.2.55 Control System .20
2.2.56 Control System Operations .20
2.2.57 Cookie .20
2.2.58 Countermeasure .20
2.2.59 Cracker .20
2.2.60 Credential .21
2.2.61 Critical System Resource .21
2.2.62 Crypto-algorithm .21
2.2.63 Cryptographic Hash .21
2.2.64 Cryptographic Key .21
2.2.65 Cryptography .21
2.2.66 Cyber.21
2.2.67 Cyber Attack .21
2.2.68 Cyber Security .22
2.2.69 Cyclic Redundancy Check (CRC) .22
2.2.70 Data Authentication.22
2.2.71 Data Corruption .22
2.2.72 Data Encryption Standard (DES).22
2.2.73 Data Integrity .22
2.2.74 Data Object (DO) .22
2.2.75 Data Security .22
2.2.76 Datagram .22
2.2.77 Decode .23
2.2.78 Decrypt .23
2.2.79 Decryption .23
2.2.80 De-Facto Standard.23
2.2.81 Defence in Depth .23
2.2.82 Denial of Service (DoS).23
2.2.83 Designated Approving Authority (DAA).24
2.2.84 Device .24
2.2.85 Diffie-Hellman Key Exchange.24
2.2.86 Digital Certificate .24
2.2.87 Digital Data.24
2.2.88 Digital Signature .24
2.2.89 Digital Signature Standard (DSS).25

– 4 – TS 62351-2 © IEC:2008(E)

2.2.90 Distributed Control System (DCS) .25
2.2.91 Dongle .25
2.2.92 Eavesdropping .25
2.2.93 Electronic Deception .25
2.2.94 Elliptic Curve Cryptography.25
2.2.95 Encrypt .25
2.2.96 Encryption.25
2.2.97 Firewall .26
2.2.98 Flooding.26
2.2.99 Flow Control .26
2.2.100 Functions .26
2.2.101 Gateway .26
2.2.102 Generic Upper Layer Security (GULS).26
2.2.103 Hacker .26
2.2.104 Hash Function.27
2.2.105 Honey Pot.27
2.2.106 Identification .27
2.2.107 IEEE 802.11i.27
2.2.108 Information Security.27
2.2.109 Instrumentation, Systems, and Automation Society (ISA) .27
2.2.110 Integrity .27
2.2.111 Intelligent Electronic Device (IED).28
2.2.112 Intercept .28
2.2.113 Interchangeability.28
2.2.114 Interface .28
2.2.115 Internet Protocol security (IPsec) .28
2.2.116 Interoperability.28
2.2.117 Intruder .28
2.2.118 Intrusion Detection System (IDS) .29
2.2.119 Key .29
2.2.120 Key Distribution .29
2.2.121 Key Logger .29
2.2.122 Key Pair.29
2.2.123 Key Update .29
2.2.124 Latency.29
2.2.125 Local Area Network (LAN).29
2.2.126 Malicious Code .29
2.2.127 Malware .30
2.2.128 Management Information Base (MIB) .30
2.2.129 Man-in-the-Middle Attack .30
2.2.130 Manufacturing Message Specification (MMS) .30
2.2.131 Masquerade.30
2.2.132 Mockingbird .31
2.2.133 Multicast .31
2.2.134 Network Layer Protocol.31
2.2.135 Network Management .31
2.2.136 Non-repudiation .31
2.2.137 Object Identifier (OID).31
2.2.138 Open Protocol.31

TS 62351-2 © IEC:2008(E) – 5 –

2.2.139 Open System .31
2.2.140 Open Systems Architecture.32
2.2.141 Open Systems Interconnection – Reference Model (OSI-RM).32
2.2.142 Password.32
2.2.143 Personal Identification Number (PIN) .32
2.2.144 Phishing.32
2.2.145 Physical Layer Protocol.32
2.2.146 Plaintext.32
2.2.147 Point-to-Point Protocol (PPP).33
2.2.148 Port Scanning .33
2.2.149 Pretty Good Privacy (PGP) .33
2.2.150 Private Key .33
2.2.151 Protection Profile .33
2.2.152 Proxy, Proxy Server .33
2.2.153 Pseudorandom Number Generator (PRNG).34
2.2.154 Public Key.34
2.2.155 Public Key Asymmetric Cryptographic Algorithm .34
2.2.156 Public Key Certificate.34
2.2.157 Public Key Cryptography.34
2.2.158 Public Key Infrastructure (PKI) .35
2.2.159 Replay Attack.35
2.2.160 Repudiation .35
2.2.161 Risk .35
2.2.162 Risk Assessment .35
2.2.163 Risk Management .35
2.2.164 Rivest, Shamir and Adleman (RSA).36
2.2.165 Role Based Access Control (RBAC) .36
2.2.166 Secret Key .36
2.2.167 Secret Key Encryption.36
2.2.168 Secret Key Symmetric Cryptographic Algorithm .36
2.2.169 Secure Hash Algorithm (SHA) .36
2.2.170 Secure Shell (SSH) .36
2.2.171 Secure Sockets Layer (SSL) .36
2.2.172 Secure/ Multipurpose Internet Mail Extensions (S/MIME) .37
2.2.173 Security .37
2.2.174 Security Domain.37
2.2.175 Security Guidelines .37
2.2.176 Security Management .37
2.2.177 Security Performance.37
2.2.178 Security Perimeter .37
2.2.179 Security Policy .38
2.2.180 Security Risk Assessment.38
2.2.181 Security Services .38
2.2.182 Server.38
2.2.183 Session Key.38
2.2.184 Shoulder Surfing .38
2.2.185 Signature Certificate .38
2.2.186 Simple Network Management Protocol (SNMP).38
2.2.187 Smart Card .39

– 6 – TS 62351-2 © IEC:2008(E)

2.2.188 Smurf.39
2.2.189 Sniffing .39
2.2.190 Social Engineering .39
2.2.191 Spoof .39
2.2.192 Spyware.39
2.2.193 Strong Authentication.39
2.2.194 Strong Secret.39
2.2.195 Supervisory Control and Data Acquisition (SCADA) .39
2.2.196 Symmetric Cryptography.40
2.2.197 Symmetric Key.40
2.2.198 Symmetric Key Algorithm .40
2.2.199 SYN Flood .40
2.2.200 Tamper Detection .40
2.2.201 Tampering.40
2.2.202 TASE.2 .40
2.2.203 Threat .40
2.2.204 Throughput .40
2.2.205 Traffic Analysis .41
2.2.206 Transport Level Security (TLS) .41
2.2.207 Trap Door .41
2.2.208 Triple DES .41
2.2.209 Trojan Horse .41
2.2.210 Trust .41
2.2.211 Tunnel .42
2.2.212 Unforgeable .42
2.2.213 Update Key.42
2.2.214 Virtual Private Network (VPN) .42
2.2.215 Virus .43
2.2.216 Vulnerability.43
2.2.217 Vulnerability Assessment .43
2.2.218 Wide Area Network (WAN) .43
2.2.219 WiFi .43
2.2.220 Wired Equivalent Privacy (WEP) .43
2.2.221 Wireless Application Protocol (WAP).44
2.2.222 Wireless LAN (WLAN).44
2.2.223 Worm .44
2.2.224 X.509 .44
3 Abbreviations .45
3.1.1 3DES .45
3.1.2 ACL .45
3.1.3 ACSI .45
3.1.4 AES .45
3.1.5 AGA.45
3.1.6 ANSI .45
3.1.7 BIS .45
3.1.8 BSI .45
3.1.9 BTW .45
3.1.10 CA .45
3.1.11 CERT.45

TS 62351-2 © IEC:2008(E) – 7 –

3.1.12 CHAP.45
3.1.13 CIP .45
3.1.14 CRC.45
3.1.15 CRL .45
3.1.16 DAA .45
3.1.17 DCS.45
3.1.18 DES .45
3.1.19 DO .45
3.1.20 DoS .45
3.1.21 DSS .45
3.1.22 ECC.45
3.1.23 EM/RF .45
3.1.24 EMS.45
3.1.25 FIPS .45
3.1.26 GULS.45
3.1.27 ICCP.45
3.1.28 IDS .46
3.1.29 IED .46
3.1.30 IEEE .46
3.1.31 IETF.46
3.1.32 IPS .46
3.1.33 IPsec .46
3.1.34 ISA .46
3.1.35 ISO .46
3.1.36 IT .46
3.1.37 LAN .46
3.1.38 MIB .46
3.1.39 MMS .46
3.1.40 NERC .46
3.1.41 NIST .46
3.1.42 OID .46
3.1.43 OSI-RM.46
3.1.44 PGP.46
3.1.45 PICS .46
3.1.46 PIN .46
3.1.47 PIXIT .46
3.1.48 PKI .46
3.1.49 PLC .46
3.1.50 PLC .47
3.1.51 PPP .47
3.1.52 PRNG .47
3.1.53 RA .47
3.1.54 RBAC.47
3.1.55 RSA .47
3.1.56 RTU .47
3.1.57 SCADA .47
3.1.58 SHA .47
3.1.59 SNMP .47
3.1.60 SSH .47

– 8 – TS 62351-2 © IEC:2008(E)

3.1.61 SSL.47
3.1.62 TASE.2 .47
3.1.63 TDEA .47
3.1.64 TDES .47
3.1.65 TLS.47
3.1.66 VPN .47
3.1.67 WAN .47
3.1.68 WEP .47
3.1.69 WiFi .47
3.1.70 WLAN .47
3.1.71 WPA .47
BIBLIOGRAPHY .48

TS 62351-2 © IEC:2008(E) – 9 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER SYSTEMS MANAGEMENT AND
ASSOCIATED INFORMATION EXCHANGE –
DATA AND COMMUNICATIONS SECURITY –

Part 2: Glossary of terms
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
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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
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
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The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
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• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• The subject is still under technical development or where, for any other reason, there is
the future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC 62351-2, which is a technical specification, has been prepared by IEC technical
committee 57: Power systems management and associated information exchange.

– 10 – TS 62351-2 © IEC:2008(E)

The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
57/853/DTS 57/922/RVC
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.
A list of all parts of the IEC 62351 series, 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 publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual edition of this document may be issued at a later date.

TS 62351-2 © IEC:2008(E) – 11 –

POWER SYSTEMS MANAGEMENT AND
ASSOCIATED INFORMATION EXCHANGE –
DATA AND COMMUNICATIONS SECURITY –

Part 2: Glossary of terms
1 Scope and object
This part of IEC 62351 covers the key terms used in the IEC 62351 series, and is not meant
to be a definitive list. Most terms used for cyber security are formally defined by other
standards organizations, and so are included here with references to where they were
originally defined.
2 Terms and definitions
2.1 Glossary references and permissions
With permission granted by the appropriate organizations, the definitions in this glossary were
copied from the following sources:
• [API 1164] American Petroleum Institute. This standard on SCADA security
provides guidance to the operators of Oil and Gas liquid pipeline systems for
managing SCADA system integrity and security. The use of this document is not
limited to pipelines, but should be viewed as a listing of best practices to be
employed when reviewing and developing standards for a SCADA system. This
document embodies the "API Security Guidelines for the Petroleum Industry." This
guideline is specifically designed to provide the operators with a description of
industry practices in SCADA Security, and to provide the framework needed to
develop sound security practices within the operator's individual companies.
• [ATIS] ATIS Telecom Glossary 2007 at http://www.atis.org/glossary/. This web site
incorporates and supersedes T1.523-2001, the ATIS Telecom Glossary of 2000
which was an expansion of FS-1037C, the Federal Standard 1037, Glossary of
Telecommunication Terms initially published in 1980 .
• [FIPS-140-2] This is the US Federal Information Processing Standard Publication
140-2, titled “Security Requirements for Cryptographic Modules”.
• [ISA99] This ISA Technical Report provides a framework for developing an
electronic security program and provides a recommended organization and
structure f
...

IEC/TS 62351-2
Edition 1.0 2008-08
TECHNICAL
SPECIFICATION
Power systems management and associated information exchange – Data and
communications security –
Part 2: Glossary of terms
IEC/TS 62351-2:2008(E)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: [e-mail]
Tel.: [phone]
Fax: [phone]
IEC/TS 62351-2
Edition 1.0 2008-08
TECHNICAL
SPECIFICATION
Power systems management and associated information exchange – Data and
communications security –
Part 2: Glossary of terms
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XA
ICS 33.200 ISBN 2-8318-9956-7
– 2 – TS 62351-2 © IEC:2008(E)

CONTENTS
FOREWORD.9
1 Scope and object.11
2 Terms and definitions .11
2.1 Glossary references and permissions .11
2.2 Glossary of security and related communication terms .13
2.2.1 Abstract Communication Service Interface (ACSI).13
2.2.2 Access .13
2.2.3 Access Authority .13
2.2.4 Access Control.13
2.2.5 Access Control List (ACL) .13
2.2.6 Accountability .13
2.2.7 Adequate Security.13
2.2.8 Advanced Encryption Standard (AES) .14
2.2.9 Alarm .14
2.2.10 Application Layer .14
2.2.11 Association .14
2.2.12 Assurance.14
2.2.13 Asymmetric Cipher.14
2.2.14 Asymmetric Cryptography .14
2.2.15 Asymmetric Key Pair.14
2.2.16 Attack .14
2.2.17 Audit .15
2.2.18 Audit Log .15
2.2.19 Audit Record Field .15
2.2.20 Audit Trail .15
2.2.21 Authentic Signature.15
2.2.22 Authentication.15
2.2.23 Authorization.15
2.2.24 Authorization Process .15
2.2.25 Authorized User .16
2.2.26 Availability .16
2.2.27 Back Door .16
2.2.28 Bandwidth.16
2.2.29 Biometric .16
2.2.30 Block Cipher .16
2.2.31 Boundary Protection.16
2.2.32 Buffer Overflow .16
2.2.33 Bump-in-the-Stack .17
2.2.34 Bump-in-the-Wire.17
2.2.35 Call Back .17
2.2.36 Certificate .17
2.2.37 Certificate Management .17
2.2.38 Certificate Revocation List (CRL) .17
2.2.39 Certification .17
2.2.40 Certification Authority (CA) .18

TS 62351-2 © IEC:2008(E) – 3 –

2.2.41 Chain of Custody .18
2.2.42 Challenge Handshake Authentication Protocol (CHAP) .18
2.2.43 Challenge-Response, Challenge-Response Protocol.18
2.2.44 Checksum.18
2.2.45 Cipher.18
2.2.46 Ciphertext .19
2.2.47 Cleartext .19
2.2.48 Client .19
2.2.49 Compromise.19
2.2.50 Computer Emergency Response Team (CERT).19
2.2.51 Computer Virus .19
2.2.52 Confidentiality .19
2.2.53 Conformance Test.19
2.2.54 Control Network .20
2.2.55 Control System .20
2.2.56 Control System Operations .20
2.2.57 Cookie .20
2.2.58 Countermeasure .20
2.2.59 Cracker .20
2.2.60 Credential .21
2.2.61 Critical System Resource .21
2.2.62 Crypto-algorithm .21
2.2.63 Cryptographic Hash .21
2.2.64 Cryptographic Key .21
2.2.65 Cryptography .21
2.2.66 Cyber.21
2.2.67 Cyber Attack .21
2.2.68 Cyber Security .22
2.2.69 Cyclic Redundancy Check (CRC) .22
2.2.70 Data Authentication.22
2.2.71 Data Corruption .22
2.2.72 Data Encryption Standard (DES).22
2.2.73 Data Integrity .22
2.2.74 Data Object (DO) .22
2.2.75 Data Security .22
2.2.76 Datagram .22
2.2.77 Decode .23
2.2.78 Decrypt .23
2.2.79 Decryption .23
2.2.80 De-Facto Standard.23
2.2.81 Defence in Depth .23
2.2.82 Denial of Service (DoS).23
2.2.83 Designated Approving Authority (DAA).24
2.2.84 Device .24
2.2.85 Diffie-Hellman Key Exchange.24
2.2.86 Digital Certificate .24
2.2.87 Digital Data.24
2.2.88 Digital Signature .24
2.2.89 Digital Signature Standard (DSS).25

– 4 – TS 62351-2 © IEC:2008(E)

2.2.90 Distributed Control System (DCS) .25
2.2.91 Dongle .25
2.2.92 Eavesdropping .25
2.2.93 Electronic Deception .25
2.2.94 Elliptic Curve Cryptography.25
2.2.95 Encrypt .25
2.2.96 Encryption.25
2.2.97 Firewall .26
2.2.98 Flooding.26
2.2.99 Flow Control .26
2.2.100 Functions .26
2.2.101 Gateway .26
2.2.102 Generic Upper Layer Security (GULS).26
2.2.103 Hacker .26
2.2.104 Hash Function.27
2.2.105 Honey Pot.27
2.2.106 Identification .27
2.2.107 IEEE 802.11i.27
2.2.108 Information Security.27
2.2.109 Instrumentation, Systems, and Automation Society (ISA) .27
2.2.110 Integrity .27
2.2.111 Intelligent Electronic Device (IED).28
2.2.112 Intercept .28
2.2.113 Interchangeability.28
2.2.114 Interface .28
2.2.115 Internet Protocol security (IPsec) .28
2.2.116 Interoperability.28
2.2.117 Intruder .28
2.2.118 Intrusion Detection System (IDS) .29
2.2.119 Key .29
2.2.120 Key Distribution .29
2.2.121 Key Logger .29
2.2.122 Key Pair.29
2.2.123 Key Update .29
2.2.124 Latency.29
2.2.125 Local Area Network (LAN).29
2.2.126 Malicious Code .29
2.2.127 Malware .30
2.2.128 Management Information Base (MIB) .30
2.2.129 Man-in-the-Middle Attack .30
2.2.130 Manufacturing Message Specification (MMS) .30
2.2.131 Masquerade.30
2.2.132 Mockingbird .31
2.2.133 Multicast .31
2.2.134 Network Layer Protocol.31
2.2.135 Network Management .31
2.2.136 Non-repudiation .31
2.2.137 Object Identifier (OID).31
2.2.138 Open Protocol.31

TS 62351-2 © IEC:2008(E) – 5 –

2.2.139 Open System .31
2.2.140 Open Systems Architecture.32
2.2.141 Open Systems Interconnection – Reference Model (OSI-RM).32
2.2.142 Password.32
2.2.143 Personal Identification Number (PIN) .32
2.2.144 Phishing.32
2.2.145 Physical Layer Protocol.32
2.2.146 Plaintext.32
2.2.147 Point-to-Point Protocol (PPP).33
2.2.148 Port Scanning .33
2.2.149 Pretty Good Privacy (PGP) .33
2.2.150 Private Key .33
2.2.151 Protection Profile .33
2.2.152 Proxy, Proxy Server .33
2.2.153 Pseudorandom Number Generator (PRNG).34
2.2.154 Public Key.34
2.2.155 Public Key Asymmetric Cryptographic Algorithm .34
2.2.156 Public Key Certificate.34
2.2.157 Public Key Cryptography.34
2.2.158 Public Key Infrastructure (PKI) .35
2.2.159 Replay Attack.35
2.2.160 Repudiation .35
2.2.161 Risk .35
2.2.162 Risk Assessment .35
2.2.163 Risk Management .35
2.2.164 Rivest, Shamir and Adleman (RSA).36
2.2.165 Role Based Access Control (RBAC) .36
2.2.166 Secret Key .36
2.2.167 Secret Key Encryption.36
2.2.168 Secret Key Symmetric Cryptographic Algorithm .36
2.2.169 Secure Hash Algorithm (SHA) .36
2.2.170 Secure Shell (SSH) .36
2.2.171 Secure Sockets Layer (SSL) .36
2.2.172 Secure/ Multipurpose Internet Mail Extensions (S/MIME) .37
2.2.173 Security .37
2.2.174 Security Domain.37
2.2.175 Security Guidelines .37
2.2.176 Security Management .37
2.2.177 Security Performance.37
2.2.178 Security Perimeter .37
2.2.179 Security Policy .38
2.2.180 Security Risk Assessment.38
2.2.181 Security Services .38
2.2.182 Server.38
2.2.183 Session Key.38
2.2.184 Shoulder Surfing .38
2.2.185 Signature Certificate .38
2.2.186 Simple Network Management Protocol (SNMP).38
2.2.187 Smart Card .39

– 6 – TS 62351-2 © IEC:2008(E)

2.2.188 Smurf.39
2.2.189 Sniffing .39
2.2.190 Social Engineering .39
2.2.191 Spoof .39
2.2.192 Spyware.39
2.2.193 Strong Authentication.39
2.2.194 Strong Secret.39
2.2.195 Supervisory Control and Data Acquisition (SCADA) .39
2.2.196 Symmetric Cryptography.40
2.2.197 Symmetric Key.40
2.2.198 Symmetric Key Algorithm .40
2.2.199 SYN Flood .40
2.2.200 Tamper Detection .40
2.2.201 Tampering.40
2.2.202 TASE.2 .40
2.2.203 Threat .40
2.2.204 Throughput .40
2.2.205 Traffic Analysis .41
2.2.206 Transport Level Security (TLS) .41
2.2.207 Trap Door .41
2.2.208 Triple DES .41
2.2.209 Trojan Horse .41
2.2.210 Trust .41
2.2.211 Tunnel .42
2.2.212 Unforgeable .42
2.2.213 Update Key.42
2.2.214 Virtual Private Network (VPN) .42
2.2.215 Virus .43
2.2.216 Vulnerability.43
2.2.217 Vulnerability Assessment .43
2.2.218 Wide Area Network (WAN) .43
2.2.219 WiFi .43
2.2.220 Wired Equivalent Privacy (WEP) .43
2.2.221 Wireless Application Protocol (WAP).44
2.2.222 Wireless LAN (WLAN).44
2.2.223 Worm .44
2.2.224 X.509 .44
3 Abbreviations .45
3.1.1 3DES .45
3.1.2 ACL .45
3.1.3 ACSI .45
3.1.4 AES .45
3.1.5 AGA.45
3.1.6 ANSI .45
3.1.7 BIS .45
3.1.8 BSI .45
3.1.9 BTW .45
3.1.10 CA .45
3.1.11 CERT.45

TS 62351-2 © IEC:2008(E) – 7 –

3.1.12 CHAP.45
3.1.13 CIP .45
3.1.14 CRC.45
3.1.15 CRL .45
3.1.16 DAA .45
3.1.17 DCS.45
3.1.18 DES .45
3.1.19 DO .45
3.1.20 DoS .45
3.1.21 DSS .45
3.1.22 ECC.45
3.1.23 EM/RF .45
3.1.24 EMS.45
3.1.25 FIPS .45
3.1.26 GULS.45
3.1.27 ICCP.45
3.1.28 IDS .46
3.1.29 IED .46
3.1.30 IEEE .46
3.1.31 IETF.46
3.1.32 IPS .46
3.1.33 IPsec .46
3.1.34 ISA .46
3.1.35 ISO .46
3.1.36 IT .46
3.1.37 LAN .46
3.1.38 MIB .46
3.1.39 MMS .46
3.1.40 NERC .46
3.1.41 NIST .46
3.1.42 OID .46
3.1.43 OSI-RM.46
3.1.44 PGP.46
3.1.45 PICS .46
3.1.46 PIN .46
3.1.47 PIXIT .46
3.1.48 PKI .46
3.1.49 PLC .46
3.1.50 PLC .47
3.1.51 PPP .47
3.1.52 PRNG .47
3.1.53 RA .47
3.1.54 RBAC.47
3.1.55 RSA .47
3.1.56 RTU .47
3.1.57 SCADA .47
3.1.58 SHA .47
3.1.59 SNMP .47
3.1.60 SSH .47

– 8 – TS 62351-2 © IEC:2008(E)

3.1.61 SSL.47
3.1.62 TASE.2 .47
3.1.63 TDEA .47
3.1.64 TDES .47
3.1.65 TLS.47
3.1.66 VPN .47
3.1.67 WAN .47
3.1.68 WEP .47
3.1.69 WiFi .47
3.1.70 WLAN .47
3.1.71 WPA .47
BIBLIOGRAPHY .48

TS 62351-2 © IEC:2008(E) – 9 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER SYSTEMS MANAGEMENT AND
ASSOCIATED INFORMATION EXCHANGE –
DATA AND COMMUNICATIONS SECURITY –

Part 2: Glossary of terms
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• The subject is still under technical development or where, for any other reason, there is
the future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC 62351-2, which is a technical specification, has been prepared by IEC technical
committee 57: Power systems management and associated information exchange.

– 10 – TS 62351-2 © IEC:2008(E)

The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
57/853/DTS 57/922/RVC
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.
A list of all parts of the IEC 62351 series, 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 publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual edition of this document may be issued at a later date.

TS 62351-2 © IEC:2008(E) – 11 –

POWER SYSTEMS MANAGEMENT AND
ASSOCIATED INFORMATION EXCHANGE –
DATA AND COMMUNICATIONS SECURITY –

Part 2: Glossary of terms
1 Scope and object
This part of IEC 62351 covers the key terms used in the IEC 62351 series, and is not meant
to be a definitive list. Most terms used for cyber security are formally defined by other
standards organizations, and so are included here with references to where they were
originally defined.
2 Terms and definitions
2.1 Glossary references and permissions
With permission granted by the appropriate organizations, the definitions in this glossary were
copied from the following sources:
• [API 1164] American Petroleum Institute. This standard on SCADA security
provides guidance to the operators of Oil and Gas liquid pipeline systems for
managing SCADA system integrity and security. The use of this document is not
limited to pipelines, but should be viewed as a listing of best practices to be
employed when reviewing and developing standards for a SCADA system. This
document embodies the "API Security Guidelines for the Petroleum Industry." This
guideline is specifically designed to provide the operators with a description of
industry practices in SCADA Security, and to provide the framework needed to
develop sound security practices within the operator's individual companies.
• [ATIS] ATIS Telecom Glossary 2007 at http://www.atis.org/glossary/. This web site
incorporates and supersedes T1.523-2001, the ATIS Telecom Glossary of 2000
which was an expansion of FS-1037C, the Federal Standard 1037, Glossary of
Telecommunication Terms initially published in 1980 .
• [FIPS-140-2] This is the US Federal Information Processing Standard Publication
140-2, titled “Security Requirements for Cryptographic Modules”.
• [ISA99] This ISA Technical Report provides a framework for developing an
electronic security program and provides a recommended organization and
structure f
...