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1、 Reference number ISO 14819-6:2006(E) ISO 2006 INTERNATIONAL STANDARD ISO 14819-6 First edition 2006-04-15 Traffic and Traveller Information (TTI) TTI messages via traffic message coding Part 6: Encryption and conditional access for the Radio Data System Traffic Message Channel ALERT C coding Inform
2、ations sur le trafic et le tourisme (TTI) Messages TTI via le codage de messages sur le trafic Partie 6: Accs au cryptage et accs conditionnel pour le systme de radiodiffusion de donnes Codage ALERT C du canal de messages sur le trafic Copyright International Organization for Standardization Provide
3、d by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 19:52:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14819-6:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes lice
4、nsing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The IS
5、O Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has be
6、en taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may be repr
7、oduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22
8、749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 1
9、9:52:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14819-6:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 2 4 Symbols and abbreviations. 3 5 Notation . 4 6 Application
10、 description 4 6.1 Introduction to RDS group bit pattern and notation . 4 6.2 RDS-TMC and Open Data Application 5 6.3 Summary of TMC data elements in type 8A groups 7 7 Principles of the Encryption and Conditional Access methodology 8 8 Encryption by the service provider. 9 8.1 Service providers req
11、uirements. 9 8.2 Use of type 8A groups for RDS-TMC encryption. 9 8.3 Encryption Administration group . 10 8.4 Encrypting location codes. 12 9 Access to decrypted services by a terminal 13 9.1 Terminal manufacturers basic requirements 13 9.2 Activation of a terminal 14 9.3 Identifying an encrypted RD
12、S-TMC service. 15 9.4 Decrypting location codes. 15 10 Introduction of Encrypted services 16 10.1 Terminal responses 17 10.2 De facto strategy valid only for service providers wishing to generate revenue, prior to general availability of encryption 17 10.3 Actions for existing providers of unencrypt
13、ed TMC services . 17 10.4 Actions for potential providers of TMC services. 18 10.5 Timescales. 18 Bibliography. 19 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 19:52:41 MDTNo
14、reproduction or networking permitted without license from IHS -,-,- ISO 14819-6:2006(E) iv ISO 2006 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International St
15、andards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also
16、 take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committee
17、s is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possib
18、ility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 14819-6 was prepared by Technical Committee ISO/TC 204, Intelligent transport systems, in collaboration with CEN Technical Commit
19、tee CEN/TC 278, Road transport and traffic telematics, the secretariat of which is held by NEN. ISO 14819 consists of the following parts, under the general title Traffic and Traveller Information (TTI) TTI messages via traffic message coding: Part 1: Coding protocol for Radio Data System Traffic Me
20、ssage Channel (RDS-TMC) using ALERT-C Part 2: Event and information codes for Radio Data System Traffic Message Channel (RDS-TMC) Part 3: Location referencing for ALERT-C Part 6: Encryption and conditional access for the Radio Data System Traffic Message Channel ALERT C coding Copyright Internationa
21、l Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 19:52:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14819-6:2006(E) ISO 2006 All rights reserved v Introduction Traff
22、ic and traveller information may be disseminated through a number of services or means of communication. For such services, the data to be disseminated and the message structure involved in the various interfaces require clear definition and standard formats, in order to allow competitive products t
23、o exist with any received data. The most widely supported data specification for TTI messages within Europe and elsewhere is RDS-TMC, specified in Parts 1, 2 and 3 of EN ISO 14819. In RDS-TMC, TTI messages are conveyed using type 8A groups with the Radio Data System, itself specified in EN 62106. Th
24、e RDS-TMC standard was developed principally for the purposes of disseminating TTI data free-to-air, using a public-service model. However, in many countries, the adoption and continuance of TTI services requires a business model based on commercial principals whereby the costs for the collection of
25、 the data and its dissemination may be recovered by charging end-users or intermediaries to receive and use the data. In this model, a convenient way that this may be achieved is to encrypt the data in some way, the key to decrypt the data being made available on payment of a subscription or fee. In
26、 order to avoid a proliferation of different conditional access systems, the European receiver industry asked the TMC Forum to establish a Task Force to recommend a single method of encryption capable of being widely adopted. The task force established criteria that any encryption method would have
27、to fulfil. These included: conformity with the RDS and TMC specifications and guidelines; no, or only minimal, overhead in terms of data capacity required for encryption; no hardware change to existing terminals required; availability for use by service providers and terminal manufacturers “freely”
28、and “equitably”, either free-of- charge or on payment of a modest licence fee; applicability to both lifetime and term subscription business models; ability of terminals to be activated to receive an encrypted service on an individual basis. After calling for candidate proposals, the submission from
29、 Deutsche Telekom was judged by an expert panel to have best met the pre-determined criteria the task force had established. The method encrypts the 16 bits that form the Location element in each RDS-TMC message to render the message virtually useless without decryption. The encryption is only “ligh
30、t” but was adjudged to be adequate to deter all but the most determined hacker. More secure systems were rejected because of the RDS capacity overhead that was required. After ratification of the decision to adopt the Deutsche Telekom submission by the TMC Forum Business Group and Management Group,
31、a group was appointed and given the remit to elaborate it and present it as a specification to be submitted for standardization. The group was also requested to produce guidelines for service providers and terminal manufacturers to aid implementation of the specification. This International Standard
32、 describes a non-proprietary light encryption and conditional access system that allows commercial models for RDS-TMC to exist. The reader is assumed to have a pre-existing understanding of, and familiarity with, the RDS and RDS-TMC standards and implementation guidelines. Copyright International Or
33、ganization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 19:52:41 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS
34、under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 19:52:41 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 14819-6:2006(E) ISO 2006 All rights reserved 1 Traffic and Traveller Information (TTI) TTI me
35、ssages via traffic message coding Part 6: Encryption and conditional access for the Radio Data System Traffic Message Channel ALERT C coding 1 Scope This document establishes a method of encrypting certain elements of the ALERT-C coded data carried in the RDS-TMC type 8A data group, such that withou
36、t application by a terminal or receiver of an appropriate key, the information conveyed is virtually worthless. Before a terminal is able to decrypt the data, the terminal requires two “keys”. The first is given in confidence by the service provider to terminal manufacturers with whom they have a co
37、mmercial relationship; the second is broadcast in the “Encryption Administration Group,” which is also a type 8A group. This International Standard explains the purpose of the two keys and how often and when the transmitted key may be changed. Before an individual terminal may present decrypted mess
38、ages to the end-user, it must have been activated to do so. Activation requires that a PIN code be entered. The PIN code controls access rights to each service and subscription period, allowing both lifetime and term business models to co-exist. The International Standard also describes the consider
39、ations for service providers wishing to introduce an encrypted RDS-TMC service, migrating from either a “free-to-air” service based on public “Location Tables” or a commercial service based on a proprietary Location Table. Finally, “hooks” have been left in the bit allocation of the type 8A group to
40、 allow extension of encryption to other RDS-TMC services. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (inc
41、luding any amendments) applies. ISO 14819-1, Traffic and Traveller Information (TTI) TTI messages via traffic message coding Part 1: Coding protocol for Radio Data System Traffic Message Channel (RDS-TMC) using ALERT-C ISO 14819-2, Traffic and Traveller Information (TTI) TTI messages via traffic mes
42、sage coding Part 2: Event and information codes for Radio Data System Traffic Message Channel (RDS-TMC) ISO 14819-3, Traffic and Traveller Information (TTI) TTI messages via traffic message coding Part 3: Location referencing for ALERT-C EN 62106, Specification of the radio data system (RDS) for VHF
43、/FM sound broadcasting in the frequency range from 87, 5 to 108, 0 MHz (IEC 62106:2000) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 19:52:41 MDTNo reproduction or networking
44、permitted without license from IHS -,-,- ISO 14819-6:2006(E) 2 ISO 2006 All rights reserved 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Access Profile ACP a particular service and subscription period 3.2 Country Code CC code assigned to a
45、 country to be transmitted as the first four bits of the transmitted PI code in a broadcast RDS service EN 62106 3.3 Encryption Identifier ENCID value indicating which line in the Service Key table of parameters the service provider is using in the encryption process that day NOTE ENCID is transmitt
46、ed in type 8A groups. 3.4 Event Description details of the road situation, general or specific traffic problems, and other factors (e.g. weather) affecting or potentially affecting the passage of vehicles on the roads and highways network 3.5 Expiry Date date determined by the service provider on wh
47、ich a particular terminals ability to decrypt an encrypted service should cease (i.e. end of the paid subscription period) 3.6 Location area, highway segment or point location where the source of the problem is situated 3.7 Location Code numeric or alphanumeric representation of a location according
48、 to a pre-determined database, known as a Location Table 3.8 Location Table Number LTN number with the value 0 to 63 used to identify the Location Table used by the service provider. NOTE 1 The LTN is generally allocated to each service provider in a country by the relevant government or roads authority from a range assigned to that country. It is transmitted in type 3A groups. NOTE 2 Value 0, when transmitted in type 3A groups, shows that the service provider is encrypting the l