Nederlandse praktijkrichtlijn. NPR-IEC/TS (en)

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1 Dit document mag slechts op een stand-alone PC worden geinstalleerd. Gebruik op een netwerk is alleen. toestaan als een aanvullende licentieovereenkomst voor netwerkgebruik met NEN is afgesloten. This document may only be used on a stand-alone PC. Use in a network is only permitted when a supplementary license agreement for us in a network with NEN has been concluded. Nederlandse praktijkrichtlijn NPR-IEC/TS (en) Telecontrol equipment and systems - Part 5-7: Transmission protocols - Security extensions to IEC and IEC protocols (applying IEC 62351) (IEC/TS :2013,IDT) ICS augustus 2013

2 NPR-IEC/TS Als Nederlandse praktijkrichtlijn is aanvaard: - IEC/TS :2013,IDT Nederlands Elektrotechnisch Comité Normcommissie "Bediening op afstand van energie-voorzieningssystemen (NEC 57)" THIS PUBLICATION IS COPYRIGHT PROTECTED DEZE PUBLICATIE IS AUTEURSRECHTELIJK BESCHERMD Apart from exceptions provided by the law, nothing from this publication may be duplicated and/or published by means of photocopy, microfilm, storage in computer files or otherwise, which also applies to full or partial processing, without the written consent of the Netherlands Standardization Institute. The Netherlands Standardization Institute shall, with the exclusion of any other beneficiary, collect payments owed by third parties for duplication and/or act in and out of law, where this authority is not transferred or falls by right to the Reproduction Rights Foundation. Auteursrecht voorbehouden. Behoudens uitzondering door de wet gesteld mag zonder schriftelijke toestemming van het Nederlands Normalisatie-instituut niets uit deze uitgave worden verveelvoudigd en/of openbaar gemaakt door middel van fotokopie, microfilm, opslag in computerbestanden of anderszins, hetgeen ook van toepassing is op gehele of gedeeltelijke bewerking. Het Nederlands Normalisatie-instituut is met uitsluiting van ieder ander gerechtigd de door derden verschuldigde vergoedingen voor verveelvoudiging te innen en/of daartoe in en buiten rechte op te treden, voor zover deze bevoegdheid niet is overgedragen c.q. rechtens toekomt aan de Stichting Reprorecht. Although the utmost care has been taken with this publication, errors and omissions cannot be entirely excluded. The Netherlands Standardization Institute and/or the members of the committees therefore accept no liability, not even for direct or indirect damage, occurring due to or in relation with the application of publications issued by the Netherlands Standardization Institute. Hoewel bij deze uitgave de uiterste zorg is nagestreefd, kunnen fouten en onvolledigheden niet geheel worden uitgesloten. Het Nederlands Normalisatie-instituut en/of de leden van de commissies aanvaarden derhalve geen enkele aansprakelijkheid, ook niet voor directe of indirecte schade, ontstaan door of verband houdend met toepassing van door het Nederlands Normalisatie-instituut gepubliceerde uitgaven Nederlands Normalisatie-instituut Postbus 5059, 2600 GB Delft Telefoon (015) , Fax (015)

3 TECHNICAL SPECIFICATION IEC/TS Edition colour inside Telecontrol equipment and systems Part 5-7: Transmission protocols Security extensions to IEC and IEC protocols (applying IEC 62351) IEC/TS :2013(E)

4 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland 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. IEC Central Office Tel.: , rue de Varembé Fax: CH-1211 Geneva 20 Switzerland About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. 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. Useful links: IEC publications search - The advanced search enables you to find IEC publications by a variety of criteria (reference number, text, technical committee, ). It also gives information on projects, replaced and withdrawn publications. IEC Just Published - webstore.iec.ch/justpublished Stay up to date on all new IEC publications. Just Published details all new publications released. Available on-line and also once a month by . Electropedia - The world's leading online dictionary of electronic and electrical terms containing more than terms and definitions in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary (IEV) on-line. Customer Service Centre - webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csc@iec.ch.

5 TECHNICAL SPECIFICATION IEC/TS Edition colour inside Telecontrol equipment and systems Part 5-7: Transmission protocols Security extensions to IEC and IEC protocols (applying IEC 62351) INTERNATIONAL ELECTROTECHNICAL COMMISSION PRICE CODE X ICS ISBN Warning! Make sure that you obtained this publication from an authorized distributor. Registered trademark of the International Electrotechnical Commission

6 2 TS IEC:2013(E) CONTENTS FOREWORD Scope Normative references Terms, definitions and abbreviations Terms and definitions Abbreviated terms Selected options Overview of clause MAC algorithms Encryption algorithms Maximum error count Use of aggressive mode Operations considered critical Addressing information Implementation of messages Overview of clause Data definitions Causes of transmission Type identifiers Security statistics Variable length data Information object address Transmitting extended ASDUs using segmentation Application Service Data Units TYPE IDENT 81: S_CH_NA_1 Authentication challenge TYPE IDENT 82: S_RP_NA_1 Authentication Reply TYPE IDENT 83: S_AR_NA_1 Aggressive mode authentication request TYPE IDENT 84: S_KR_NA_1 Session key status request TYPE IDENT 85: S_KS_NA_1 Session key status TYPE IDENT 86: S_KC_NA_1 Session key change TYPE IDENT 87: S_ER_NA_1 Authentication error TYPE IDENT 88: S_UC_NA_1 User certificate TYPE IDENT 90: S_US_NA_1 User status change TYPE IDENT 91: S_UQ_NA_1 Update key change request TYPE IDENT 92: S_UR_NA_1 Update key change reply TYPE IDENT 93: S_UK_NA_1 Update key change symmetric TYPE IDENT 94: S_UA_NA_1 Update key change asymmetric TYPE IDENT 95: S_UC_NA_1 Update key change confirmation TYPE IDENT 41: S_IT_TC_1 Integrated totals containing timetagged security statistics Implementation of procedures Overview of clause Initialization of aggressive mode Refreshing challenge data Co-existence with non-secure implementations... 34

7 TS IEC:2013(E) 3 9 Implementation of IEC/TS using IEC Overview of clause Deprecation of non-encrypting cipher suites Mandatory cipher suite Recommended cipher suites Negotiation of versions Cipher renegotiation Message authentication code Certificate support Overview of clause Multiple Certificate Authorities (CAs) Certificate size Certificate exchange Certificate comparison Co-existence with non-secure protocol traffic Use with redundant channels Protocol Implementation Conformance Statement Overview of clause Required algorithms MAC algorithms Key wrap algorithms Use of error messages Update key change methods User status change Configurable parameters Configurable statistic thresholds and statistic information object addresses Critical functions Bibliography Figure 1 ASDU segmentation control Figure 2 Segmenting extended ASDUs Figure 3 Illustration of ASDU segment reception state machine Figure 4 ASDU: S_CH_NA_1 Authentication challenge Figure 5 ASDU: S_RP_NA_1 Authentication Reply Figure 6 ASDU: S_AR_NA_1 Aggressive Mode Authentication Request Figure 7 ASDU: S_KR_NA_1 Session key status request Figure 8 ASDU: S_KS_NA_1 Session key status Figure 9 ASDU: S_KC_NA_1 Session key change Figure 10 ASDU: S_ER_NA_1 Authentication error Figure 11 ASDU: S_UC_NA_1 User certificate Figure 12 ASDU: S_US_NA_1 User status change Figure 13 ASDU: S_UQ_NA_1 Update key change request Figure 14 ASDU: S_UR_NA_1 Update key change reply Figure 15 ASDU: S_UK_NA_1 Update key change symmetric Figure 16 ASDU: S_UA_NA_1 Update key change asymmetric Figure 17 ASDU: S_UC_NA_1 Update key change confirmation... 29

8 4 TS IEC:2013(E) Figure 18 ASDU: S_IT_TC_1 Integrated totals containing time-tagged security statistics Figure 19 Example of successful initialization of challenge data Table 1 Additional cause of transmission Table 2 Additional type identifiers Table 3 Maximum lengths of variable length data Table 4 ASDU segment reception state machine Table 5 Recommended cipher suite combinations... 35

9 TS IEC:2013(E) 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION TELECONTROL EQUIPMENT AND SYSTEMS Part 5-7: Transmission protocols Security extensions to IEC and IEC protocols (applying IEC 62351) 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 nongovernmental 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. 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 , which is a technical specification, has been prepared by IEC technical committee 57: Power systems management and associated information exchange.

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