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© Andreas Diehl, All Rights Reserved
1
An Ontology for GenericWireless Authentication Data
Asma Alazeib, Hamburg University of Technology, GermanyAndreas Diehl, University of Plymouth, UKIn co-operation with Alcatel SEL AG, Germany
July 20th, 2005
8th Intl. Protégé Conference - July 18-21, 2005 - Madrid, Spain
© Andreas Diehl, All Rights Reserved
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Outline
Introduction to the GSM Network
Restructuring of the Wireless Telecommunication Networks
GSM, UMTS, WLAN Authentication
Overview of our Ontology
Future data integration
Conclusions
© Andreas Diehl, All Rights Reserved
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The GSM NetworkEach area owns the main GSM subscriber database (HLR)Subscriber data is distributed all over a network (country)Services/applications have to be deployed for each area
© Andreas Diehl, All Rights Reserved
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Problems of Wireless Telecom. Providers
Distributed subscriber profilesDistributed applications and dataNo complete subscriber profileVarious local applications (e.g. billing, CRM) for one userClosed mobile networks (difficult integration of Third Party applications)Vendor dependent network nodesLong installation/deployment time for new services
Complex and diverse networks
© Andreas Diehl, All Rights Reserved
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WLAN Domain UMTS Domain
Restructuring Telecom. Networks I
GSM Domain
HLR
HLR
NGPR
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Advantages of a restructured network
Integration of all access networks (domains) of the operatorRe-usage of data and services for different access networks Access for the complete subscriber profile Reduced network complexitySimple support of seamless servicesFaster service access and deploymentReduced maintenance costs
© Andreas Diehl, All Rights Reserved
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Protégé OWL for Data Modelling
No 3GPP data model definitionSemantic Description of data
Network and area/location dedication (e.g. network nodes, algorithms)XML-based standard for semantic applications Common user data (meta-data) Separation of domain and operational knowledge (e.g. extension of GSM services)Analysis and re-use of domain knowledgeFormal description of service features and the overall concept
Better expressiveness compared to concrete data models (e.g. relational, UML/OO, XML-Schema)Implementation independent description of dataLogical description and reasoning of data
© Andreas Diehl, All Rights Reserved
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Our Concentration
Different types of data stored in the NGPR
Service and application specific data
Our concentration: Authentication specific data
WLAN Domain
UMTS Domain
GSM Domain
Authentication Specific Data
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GSM Authentication
Challenge/Response Authentication
IMSI as proof of identity
Challenge to calculate response
Network and user side response
Same response = successful authentication
IMSI IMSI
ResponseResponse
Generated Keys
Challenge
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Authentication in Other Networks
GSM: Only user is authenticated
UMTS:
Similar to GSM Authentication, butDifferent keys and algorithms used
Mutual Authentication
WLAN: Authentication methods not standardized.
Password and Certificate based methods
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© Andreas Diehl, All Rights Reserved
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Classes and Subclasses
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GSM and UMTS Classes
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Future Work
Addition of other domains and services
Ontology for Subscriber Data
Billing
CRM
Admin
TTYPE
Bluetooth
GSM/UMTS
WLAN
© Andreas Diehl, All Rights Reserved
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Conclusions
Novel approach of a common authentication model for a NGPRSemantic model offers data translation to concrete modelsEasier view compared to relational data modelsRich standard which provides a better vocabulary for data modelling
describing properties and classesrelations between classescardinalitycharacteristics of properties and enumerated classes
© Andreas Diehl, All Rights Reserved
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Thanks for your attention,Questions ?
8th Intl. Protégé Conference - July 18-21, 2005 - Madrid, Spain