Prepayment Standard Transfer Specification: An IEC standard Especificação de Transferência de Padrões de Pré Pagamento: Um padrão IEC Don Taylor

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1 Prepayment Standard Transfer Specification: An IEC standard Especificação de Transferência de Padrões de Pré Pagamento: Um padrão IEC Don Taylor

2 Prepayment Standard Transfer Specification: An IEC standard Don Taylor, STS Association, South Africa The Standard Transfer Specification is a secure message protocol between a POS and a Meter, supported by a secure Key Management System and protocol. The STS has been an industry standard since 1994 and is now also published as IEC/PAS It is currently being converted into a full IEC standard and publication is targeted for 1 st half of There are approximately 5 million STS meters installed in about 30 countries and operated by about 300 utility companies. This entire user base is served from one Key Management Center with about 700 Supply Group keys under its management care. The STS Association is the custodian of the STS and continues to sustain the standard in all its phases from development to application and maintenance. It also assures the integrity and quality of the support infrastructure and facilitates access to services like key management, product certification and the further development of standards. Members currently comprise of 18 manufacturers, 2 utility companies and one AMEU/ESLC representative. Activities of the STS Association are focusing on facilitation of key management services, product certification services, certification of other key management systems and codes of practice for key management centers. It is actively participating on WG15 of IEC TC13 towards creation of the full IEC standard, developing enhancements to the STS and to the existing key management system. IEC standards that are relevant to prepayment meters, which are already published or in final stage of publication are IEC (Glossary of terms), IEC : General requirements for metrology, IEC : Particular requirements for metrology, IEC : Framework for standardization, IEC : Particular requirements for payment meters and IEC : Standard Transfer Specification. The IEC Framework looks at the standardization of payment metering systems and covers processes, functions, data elements, system entities and interfaces from a generic perspective. It further advocates a scheme whereby many systems or subsystems may be standardized within the IEC set of standards, such as the STS, which is thus the first one in the set to be standardized in this fashion. Generic functions and processes with sub classification of functions for a single part payment meter are also detailed. The IEC Standard Transfer Specification uses the OSI reference model defining at least an application layer and physical layer protocol with the token carrier as the medium in the physical layer. This makes the standard more versatile and manageable. It also defines the generic structure for a Virtual Meter in terms of Function Objects, which in turn describe the functionality of the payment meter and, which are then specifically defined in Companion Standards under the management of the STS Association. Enhancements to the STS, currently under development, follow the same IEC reference model and maintain backward compatibility with the present STS version. Main features of the enhancements are: bulk data transfer token; token frame with up to 255 tokens in one frame; feedback data from the meter via the token carrier; 2 way

3 token carrier; 21 digit numeric token; The Companion Standards currently under consideration are: step tariff with auxiliary charges; accounting function with social credit, token credit, credit advance and lifeline credit; metering for water; control valve for water; real time clock with battery; Requirements for key management enhancements under consideration are: the key management center should be globally trusted, industry impartial and cater for the deregulated market; services should be automated on 24/7 basis and remotely accessible; variety of secure module formats, remote coding and inter KMC key exchange protocol. In conclusion it would be true to say that prepayment is still growing and developing and establishing support infrastructure in the international arena, while maintaining healthy standards.

4 Standard Transfer Specification: an IEC Standard Don Taylor chairperson STS Association South Africa sts.org..org.za STS? Payment Credit Encryption Token Decryption Credit Consumption Key Management Key Management System Supply Point Of Sale Encrypt Key Decrypt Key M Credit Token Credit Prepayment Meter Payment Consumer Consumption

5 STS? Standard Transfer Specification Secure message protocol POS / Meter Secure key management system + protocol IEC standard 5 million meters 30 countries 300 utilities 1 Key Management Center South Africa 700 SGC keys STS Association? Custodian of the STS Facilitates the support infrastructure Key Management, Certification and Standards 21 members 19 manufacturers + 2 utilities + AMEU/ESLC

6 STSA focus? Key management services Certification of products Certification of key management systems Codes of practice for key management IEC standardization STS enhancement Key management enhancement IEC Payment Meters : Glossary : General requirements (metrology) : Particular requirements (metrology) : Framework for standardization : Type Specification (payment meter) : Standard Transfer Specification

7 IEC Concept model ( ) 21) Processes General system concepts use Data Elements embodied in operate on System Entities use Functions embodied in comprises Users Interfaces Devices comprises instances Supplier Customer Operator Installer Inspector instance Token Carrier Interfaces instance Payment Meter IEC Framework ( ) 21) Generic processes More than one standard Generic functions Data Elements Customer Information Systems System 1 Create when required use CIS to POS Interfaces Point Of Sale Systems POS to Token use Carrier Interfaces System 2 System n Token Carriers STS is 1 st one of the set use Token Carrier to Meter Interfaces Payment Meters

8 IEC Meter model ( ) 21) Supply network Singlepart payment meter connected supply Metering metered supply Accounting Meter Application Process Token Carrier Interface Test Display Token Token Carrier User Interface Generic functions Delivery Time Recording Security delivered supply Load circuit IEC Standard Transfer Specification ( ) POS Application Process METER Application Process STS tokens STA DES Mag card Numeric Serial port APDU Application Layer Protocol TCDU Physical Layer Protocol Key Management Token Carrier Standard Transfer Specification APDU Application Layer Protocol TCDU Physical Layer Protocol Virtual Meter Function Objects Companion Standards

9 STS Enhancement Follows IEC model Backward compatible Bulk token ( bits) Token frame (255 tokens) Feedback from meter 2 way token carrier (Dallas ibutton, Smart card) Companion standards Companion Standards Step tariff Auxiliary charge Social credit Token credit Credit advance Lifeline credit Metering (water meter) Delivery (water valve) Real time clock Battery backup

10 Key Management enhancement Requirements Globally trusted Key Management Center Industry impartial Key Management Center Deregulated market needs Distributed services architecture Automated services 24/7 Remote Secure Module coding Variety of Secure Module formats Inter KMC protocol Standards repository STSA STS IEC International arena Creating support infrastructure Providing services

11 Finally? Article in Metering International Visit our website : sts.org..org.za Join the STS Association Come speak to me

12 Biography Speaker: Don Taylor Position: Chairman Company: STS Association Country: South Africa Don Taylor is the Director of Technology for Actaris Measurement & Systems (Pty) Ltd. He is currently Chairman of the STS Association and a participating working group member on various standards organisations such as the SANC for the IEC, SANS, NRS, STS Association and IEC. He is also a longstanding member of the SAIMC. In 1976 he graduated with a Higher National Diploma in Electrical Engineering from the Cape College for Advanced Technical Education, after which he worked for 2 years in the gold mining industry followed by 10 years for the CSIR and 18 years in the prepayment industry. He is recognized as a co founder of the prepayment industry in SA and developer of the first commercialized solid state integrated prepayment meter worldwide in He also cofounded the first South African prepayment meter manufacturing company Angcon Technologies in 1986, which later became AEG Energy Control, then Schlumberger and now Actaris. In 1994 he co founded the IEC WG15 for payment systems and in 1997 co founded the STS Association of which he has been chairman since 2000.

13 Company Background Information Company: Country: STS Association South Africa The STS Association ensures that users of the Standard Transfer Specification have the supporting infrastructure to enable the secure operation of prepayment systems, and assures the interoperability of equipment from different suppliers through the certification of STS compliant equipment. The Association promotes the application of the standard, and further develops it to meet emerging international needs for additional functionality.