Simulating The Global Directory Service With OPNET. - Alex Andrianopoulos; David W. Chadwick (Annual Simulation Symposium, 1993)

Understanding X.500 - the directory. - David W. Chadwick (Chapman and Hall, 1994)

Interdomain Guardians in a Distributed Directory Service. - David W. Chadwick; Nick Pope (INDC, 1994)

Important lessons derived from X.500 case studies. - David W. Chadwick (IEEE Netw., 1996)

A method for collecting case study information via the Internet. - David W. Chadwick (IEEE Netw., 1996)

Trust Models in ICE-TEL. - Andrew J. Young; Nada Kapidzic Cicovic; David W. Chadwick (NDSS, 1997)

Merging and extending the PGP and PEM trust models-the ICE-TEL trust model. - David W. Chadwick; Andrew J. Young; Nada Kapidzic Cicovic (IEEE Netw., 1997)

Managing the X.500 Root Naming Context. - David W. Chadwick (RFC, 1997)

Enabling the Internet White Pages Service - the Directory Guardian. - David W. Chadwick; Andrew J. Young (NDSS, 1998)

Smart Cards Aren't Always the Smart Choice. - David W. Chadwick (Computer, 1999)

Experiences of using a public key infrastructure for the preparation of examination papers. - David W. Chadwick; Rana Tassabehji; Andrew J. Young (Comput. Educ., 2000)

Providing Secure Access to Confidential Patient Information Detailing Diabetic Condition. - David W. Chadwick; John P. New; D. M. McDowall; Darren P. Mundy (International Conference on Internet Computing (1), 2001)

Evaluating Trust in a Public Key Certification Authority. - David W. Chadwick; Andrew Basden (Comput. Secur., 2001)

Knowledge Issues Raised in Modelling Trust in a Public Key Infrastructure. - Andrew Basden; Edward Ball 002; David W. Chadwick (Expert Syst. J. Knowl. Eng., 2001)

Privacy and Civil Liberties. - David W. Chadwick; Martin S. Olivier; Pierangela Samarati; Eleanor Sharpston; Bhavani Thuraisingham (DBSec, 2002)

Experiences of Using a Public Key Infrastructure to Access Patient Confidential Data over the Internet. - David W. Chadwick; Carmen Carroll; S. Harvey; John P. New; Andrew J. Young (HICSS, 2002)

RBAC Policies in XML for X.509 Based Privilege Management. - David W. Chadwick; Alexander Otenko (SEC, 2002)

Persistent versus Dynamic Role Membership. - Jean Bacon; David W. Chadwick; Alexander Otenko; Ken Moody (DBSec, 2003)

Modifying LDAP to Support PKI. - David W. Chadwick; Edward Ball 002; M. V. Sahalayev (DBSec, 2003)

Policy Based Electronic Transmission of Prescriptions. - David W. Chadwick; Darren P. Mundy (POLICY, 2003)

Deficiencies in LDAP when used to support PKI. - David W. Chadwick (Commun. ACM, 2003)

Experiences of using a PKI to access a hospital information system by high street opticians. - David W. Chadwick; Darren P. Mundy; John P. New (Comput. Commun., 2003)

The PERMIS X.509 role based privilege management infrastructure. - David W. Chadwick; Alexander Otenko (Future Gener. Comput. Syst., 2003)

Patient Privacy in Electronic Prescription Transfer. - Edward Ball 002; David W. Chadwick; Darren P. Mundy (IEEE Secur. Priv., 2003)

Role-Based Access Control With X.509 Attribute Certificates. - David W. Chadwick; Alexander Otenko; Edward Ball 002 (IEEE Internet Comput., 2003)

Threat Modelling for Active Directory. - David W. Chadwick (Communications and Multimedia Security, 2004)

Secure Role Based Messaging. - David W. Chadwick; Graeme Lunt; Gansen Zhao (Communications and Multimedia Security, 2004)

Using SAML to Link the Globus Toolkit to the Permis Authorisation Infrastructure. - David W. Chadwick; Sassa Otenko; Von Welch (Communications and Multimedia Security, 2004)

Electronic transmission of prescriptions: towards realising the dream. - Darren P. Mundy; David W. Chadwick (Int. J. Electron. Heal., 2004)

An XML Alternative for Performance and Security: ASN.1. - Darren P. Mundy; David W. Chadwick (IT Prof., 2004)

Experiences of Applying Advanced Grid Authorisation Infrastructures. - Richard O. Sinnott; A. J. Stell; David W. Chadwick; O. Otenko (EGC, 2005)

A Heterogeneous Network Access Service Based on PERMIS and SAML. - Gabriel López Millán; Óscar Cánovas Reverte; Antonio Fernandez Gómez-Skarmeta; Sassa Otenko; David W. Chadwick (EuroPKI, 2005)

Development of a Flexible PERMIS Authorisation Module for Shibboleth and Apache Server. - Wensheng Xu; David W. Chadwick; Sassa Otenko (EuroPKI, 2005)

Evolving Messaging Systems for Secure Role Based Messaging. - Gansen Zhao; David W. Chadwick (ICECCS, 2005)

Operational Models for Reputation Servers. - David W. Chadwick (iTrust, 2005)

Automated Decomposition of Access Control Policies. - Linying Su; David W. Chadwick; Andrew Basden; James A. Cunningham (POLICY, 2005)

Aspects of Trusted and Secure Business-Oriented VO Management in Service Oriented Architectures. - Adomas Svirskas; Michael D. Wilson; Alvaro E. Arenas; Emil C. Lupu; Nilufer Tuptuk; David W. Chadwick; Pablo Giambiagi; Theodosis Dimitrakos; Bob Roberts (CEC Workshops, 2005)

Trust Infrastructure for Policy based Messaging In Open Environments. - Gansen Zhao; David W. Chadwick (WETICE, 2005)

Authorisation in Grid computing. - David W. Chadwick (Inf. Secur. Tech. Rep., 2005)

'R-What?' Development of a role-based access control policy-writing tool for e-Scientists. - Sacha Brostoff; Martina Angela Sasse; David W. Chadwick; R. James Cunningham; Uche M. Mbanaso; Sassa Otenko (Softw. Pract. Exp., 2005)

Distributed Key Management for Secure Role based Messaging. - Gansen Zhao; Sassa Otenko; David W. Chadwick (AINA (1), 2006)

How to Break Access Control in a Controlled Manner. - Ana Ferreira 001; Ricardo João Cruz Correia; Luis Antunes 002; Pedro Farinha; E. Oliveira-Palhares; David W. Chadwick; Altamiro da Costa Pereira (CBMS, 2006)

Adding Support to XACML for Dynamic Delegation of Authority in Multiple Domains. - David W. Chadwick; Sassa Otenko; Tuan-Anh Nguyen (Communications and Multimedia Security, 2006)

Supporting Decentralized, Security Focused Dynamic Virtual Organizations across the Grid. - Richard O. Sinnott; David W. Chadwick; Jos Koetsier; O. Otenko; John P. Watt; Tuan-Anh Nguyen (e-Science, 2006)

The TrustCoM Approach to Enforcing Agreements between Interoperating Enterprises. - Michael D. Wilson; Alvaro Arenas; David W. Chadwick; Theo Dimitrakos; Jürgen Doser; Pablo Giambiagi; David Golby; Christian Geuer-Pollmann; Jochen Haller; Ketil Stølen; Tobias Mahler; Lorenzo Martino; et al. (I-ESA, 2006)

Providing secure coordinated access to grid services. - David W. Chadwick; Linying Su; Romain Laborde (MGC@Middleware, 2006)

Coordination between Distributed PDPs. - David W. Chadwick; Linying Su; Alexander Otenko; Romain Laborde (POLICY, 2006)

Authorisation Using Attributes from Multiple Authorities. - David W. Chadwick (WETICE, 2006)

Privacy Preserving Trust Authorization Framework Using XACML. - Uche M. Mbanaso; G. S. Cooper; David W. Chadwick; Seth Proctor (WOWMOM, 2006)

Flexible and Manageable Delegation of Authority in RBAC. - Tuan-Anh Nguyen; Linying Su; George Inman; David W. Chadwick (AINA Workshops (2), 2007)

Obligations for Role Based Access Control. - Gansen Zhao; David W. Chadwick; Sassa Otenko (AINA Workshops (1), 2007)

Obligations for Privacy and Confidentiality in Distributed Transactions. - Uche M. Mbanaso; G. S. Cooper; David W. Chadwick; Anne Anderson (EUC Workshops, 2007)

Using WebDAV for Improved Certificate Revocation and Publication. - David W. Chadwick; Sean Anthony (EuroPKI, 2007)

Multi-session Separation of Duties (MSoD) for RBAC. - David W. Chadwick; Wensheng Xu; Sassa Otenko; Romain Laborde; Bassem Nasser (ICDE Workshops, 2007)

Aggregation of attributes from different authorities. - David W. Chadwick (SecureComm, 2007)

Recognition of Authority in Virtual Organisations. - Tuan-Anh Nguyen; David W. Chadwick; Bassem Nasser (TrustBus, 2007)

Achieving fine-grained access control in virtual organizations. - Ning Zhang 001; Li Yao; Aleksandra Nenadic; Jay Chin; Carole A. Goble; Alan L. Rector; David W. Chadwick; Sassa Otenko; Qi Shi 001 (Concurr. Comput. Pract. Exp., 2007)

Coordinated decision making in distributed applications. - David W. Chadwick (Inf. Secur. Tech. Rep., 2007)

Advanced Security for Virtual Organizations: The Pros and Cons of Centralized vs Decentralized Security Models. - Richard O. Sinnott; David W. Chadwick; Thomas Doherty; David B. Martin; Anthony Stell; Gordon Stewart 002; Linying Su; John P. Watt (CCGRID, 2008)

Panel Session: What Are the Key Challenges in Distributed Security?. - Steve Barker; David W. Chadwick; Jason Crampton; Emil Lupu; Bhavani Thuraisingham (DBSec, 2008)

Federated Identity Management. - David W. Chadwick (FOSAD, 2008)

Enforcing "sticky" security policies throughout a distributed application. - David W. Chadwick; Stijn F. Lievens (Middleware Security, 2008)

Expressions of expertness: the virtuous circle of natural language for access control policy specification. - Philip Inglesant; Martina Angela Sasse; David W. Chadwick; Lei Lei Shi (SOUPS, 2008)

On the Modeling of Bell-LaPadula Security Policies Using RBAC. - Gansen Zhao; David W. Chadwick (WETICE, 2008)

Coordinating access control in grid services. - David W. Chadwick; Linying Su; Romain Laborde (Concurr. Comput. Pract. Exp., 2008)

PERMIS: a modular authorization infrastructure. - David W. Chadwick; Gansen Zhao; Sassa Otenko; Romain Laborde; Linying Su; Tuan-Anh Nguyen (Concurr. Comput. Pract. Exp., 2008)

How to Securely Break into RBAC: The BTG-RBAC Model. - Ana Ferreira 001; David W. Chadwick; Pedro Farinha; Ricardo João Cruz Correia; Gansen Zhao; Rui Chilro; Luis Filipe Coelho Antunes (ACSAC, 2009)

An advanced policy based authorisation infrastructure. - David W. Chadwick; Kaniz Fatema (Digital Identity Management, 2009)

Aggregating policies in user centric, real-time and distributed applications. - Thomas Kirkham; Ingo Dahn; David W. Chadwick; Marc Santos; Sandra Winfield (ICITST, 2009)

FileSpace: an alternative to CardSpace that supports multiple token authorisation and portability between devices. - David W. Chadwick (IDtrust, 2009)

Which Web Browsers Process SSL Certificates in a Standardized Way? - Ahmad Samer Wazan; Romain Laborde; David W. Chadwick; François Barrère; Abdelmalek Benzekri (SEC, 2009)

Attribute Aggregation in Federated Identity Management. - David W. Chadwick; George Inman (Computer, 2009)

Adding support to XACML for multi-domain user to user dynamic delegation of authority. - David W. Chadwick; Sassa Otenko; Tuan-Anh Nguyen (Int. J. Inf. Sec., 2009)

Obligations of trust for privacy and confidentiality in distributed transactions. - Uche M. Mbanaso; G. S. Cooper; David W. Chadwick; Anne Anderson (Internet Res., 2009)

CardSpace in the cloud. - David W. Chadwick; George Inman; Paul Coxwell (CCS, 2010)

Access Control in Healthcare: the methodology from legislation to practice. - Ana Ferreira 001; Ricardo João Cruz Correia; David W. Chadwick; Luis Antunes 002 (MedInfo, 2010)

A Multi-privacy Policy Enforcement System. - Kaniz Fatema; David W. Chadwick; Stijn F. Lievens (PrimeLife, 2010)

A conceptual model for attribute aggregation. - David W. Chadwick; George Inman; Nate Klingenstein (Future Gener. Comput. Syst., 2010)

Grounding information security in healthcare. - Ana Margarida Ferreira 001; Luis Filipe Coelho Antunes; David W. Chadwick; Ricardo João Cruz Correia (Int. J. Medical Informatics, 2010)

Instant certificate revocation and publication using WebDAV. - David W. Chadwick; Sean Anthony; Rune Bjerk (J. Comput. Secur., 2010)

Federated Authentication and Authorisation in the Social Science Domain. - John P. Watt; Richard O. Sinnott; George Inman; David W. Chadwick (ARES, 2011)

My Private Cloud Overview: A Trust, Privacy and Security Infrastructure for the Cloud. - David W. Chadwick; Stijn F. Lievens; Jerry den Hartog; Andreas Pashalidis; Joseph Alhadeff (IEEE CLOUD, 2011)

Security APIs for My Private Cloud - Granting access to anyone, from anywhere at any time. - David W. Chadwick; Matteo Casenove (CloudCom, 2011)

Self-Adaptive Authorization Framework for Policy Based RBAC/ABAC Models. - Christopher Bailey 003; David W. Chadwick; Rogério de Lemos (DASC, 2011)

Leveraging social networks to gain access to organisational resources. - David W. Chadwick; George Inman; Kristy W. S. Siu; Mohammad Sadek Ferdous (Digital Identity Management, 2011)

Ontology Based Interoperation for Securely Shared Services: Security Concept Matching for Authorization Policy Interoperability. - Ioana Ciuciu; Gang Zhao 001; David W. Chadwick; Quentin Reul; Robert Meersman; Cristian Vasquez Paulus; Mark Hibbert; Sandra Winfield; Thomas Kirkham (NTMS, 2011)

Extracting Access Control and Conflict Resolution Policies from European Data Protection Law. - Kaniz Fatema; David W. Chadwick; Brendan Van Alsenoy (PrimeLife, 2011)

A controlled natural language interface for authoring access control policies. - Lei Lei Shi; David W. Chadwick (SAC, 2011)

F-SAMS: Reliably Identifying Attributes and Their Identity Providers in a Federation. - David W. Chadwick; Mark Hibbert (OTM Workshops, 2012)

A privacy preserving authorisation system for the cloud. - David W. Chadwick; Kaniz Fatema (J. Comput. Syst. Sci., 2012)

The Trusted Attribute Aggregation Service (TAAS) - Providing an Attribute Aggregation Layer for Federated Identity Management. - David W. Chadwick; George Inman (ARES, 2013)

Enabling the Autonomic Management of Federated Identity Providers. - Christopher Bailey 003; David W. Chadwick; Rogério de Lemos; Kristy W. S. Siu (AIMS, 2013)

PKI Interoperability: Still an Issue? A Solution in the X.509 Realm. - Ahmad Samer Wazan; Romain Laborde; François Barrère; Abdelmalek Benzekri; David W. Chadwick (World Conference on Information Security Education, 2013)

Towards Automated Trust Establishment in Federated Identity Management. - David W. Chadwick; Mark Hibbert (IFIPTM, 2013)

Use of Role Based Access Control for Security-Purpose Hypervisors. - Manabu Hirano; David W. Chadwick; Suguru Yamaguchi (TrustCom/ISPA/IUCC, 2013)

Guest editorial: A brief overview of data leakage and insider threats. - Carly L. Huth; David W. Chadwick; William R. Claycomb; Ilsun You (Inf. Syst. Frontiers, 2013)

My private cloud - granting federated access to cloud resources. - David W. Chadwick; Matteo Casenove; Kristy W. S. Siu (J. Cloud Comput., 2013)

Resolving Policy Conflicts - Integrating Policies from Multiple Authors. - Kaniz Fatema; David W. Chadwick (CAiSE Workshops, 2014)

Adding Federated Identity Management to OpenStack. - David W. Chadwick; Kristy W. S. Siu; Craig A. Lee; Yann Fouillat; Damien Germonville (J. Grid Comput., 2014)

Self-adaptive federated authorization infrastructures. - Christopher Bailey 003; David W. Chadwick; Rogério de Lemos (J. Comput. Syst. Sci., 2014)

Security-as-a-Service in Multi-cloud and Federated Cloud Environments. - Pramod S. Pawar; Ali Sajjad; Theo Dimitrakos; David W. Chadwick (IFIPTM, 2015)

Boosting Usability for Protecting Online Banking Applications Against APTs. - Mohannad Alhanahnah; David W. Chadwick (CCC, 2016)

How Can I Trust an X.509 Certificate? An Analysis of the Existing Trust Approaches. - Ahmad Samer Wazan; Romain Laborde; David W. Chadwick; François Barrère; Abdelmalek Benzekri (LCN, 2016)

TLS Connection Validation by Web Browsers: Why do Web Browsers Still Not Agree? - Ahmad Samer Wazan; Romain Laborde; David W. Chadwick; François Barrère; Abdelmalek Benzekri (COMPSAC (1), 2017)

An architecture for privacy-preserving sharing of CTI with 3rd party analysis services. - Fabio Giubilo; Ali Sajjad; Mark Shackleton; David W. Chadwick; Wenjun Fan; Rogério de Lemos (ICITST, 2017)

Authorization Policy Federation in Heterogeneous Multicloud Environments. - Ioram Schechtman Sette; David W. Chadwick; Carlos A. G. Ferraz (IEEE Cloud Comput., 2017)

Integrating an AAA-based federation mechanism for OpenStack - The CLASSe view. - Alejandro Pérez-Méndez; Gabriel López Millán; Rafael Marín López; David W. Chadwick; Ioram Schechtman Sette (Concurr. Comput. Pract. Exp., 2017)

Trust Management for Public Key Infrastructures: Implementing the X.509 Trust Broker. - Ahmad Samer Wazan; Romain Laborde; David W. Chadwick; François Barrère; Abdelmalek Benzekri; Mustafa Kaiiali; Adib Habbal (Secur. Commun. Networks, 2017)

Enabling Privacy-Preserving Sharing of Cyber Threat Information in the Cloud. - Wenjun Fan; Joanna Ziembicka; Rogério de Lemos; David W. Chadwick; Francesco Di Cerbo; Ali Sajjad; Xiao-Si Wang; Ian Herwono (CSCloud/EdgeCom, 2019)

Mapeamentos Sintático e Semântico em Federações de Políticas de Autorização para Nuvens Heterogêneas. - Ioram Schechtman Sette; Marcus Rafael Xavier; Carlos A. G. Ferraz; David W. Chadwick (SBRC, 2019)

Improved Identity Management with Verifiable Credentials and FIDO. - David W. Chadwick; Romain Laborde; Arnaud Oglaza; Rémi Venant; Ahmad Samer Wazan; Manreet Nijjar (IEEE Commun. Stand. Mag., 2019)

Know Your Customer: Opening a new bank account online using UAAF. - Romain Laborde; Arnaud Oglaza; Ahmad Samer Wazan; François Barrère; Abdelmalek Benzekri; David W. Chadwick; Rémi Venant (CCNC, 2020)

A User-Centric Identity Management Framework based on the W3C Verifiable Credentials and the FIDO Universal Authentication Framework. - Romain Laborde; Arnaud Oglaza; Ahmad Samer Wazan; François Barrère; Abdelmalek Benzekri; David W. Chadwick; Rémi Venant (CCNC, 2020)

A cloud-edge based data security architecture for sharing and analysing cyber threat information. - David W. Chadwick; Wenjun Fan; Gianpiero Costantino; Rogério de Lemos; Francesco Di Cerbo; Ian Herwono; Mirko Manea; Paolo Mori; Ali Sajjad; Xiao-Si Wang (Future Gener. Comput. Syst., 2020)

RootAsRole: Towards a Secure Alternative to sudo/su Commands for Home Users and SME Administrators. - Ahmad Samer Wazan; David W. Chadwick; Rémi Venant; Romain Laborde; Abdelmalek Benzekri (SEC, 2021)

A novel approach to establish trust in verifiable credential issuers in Self-sovereign identity ecosystems using TRAIN. - Isaac Henderson Johnson Jeyakumar; David W. Chadwick; Michael Kubach (Open Identity Summit, 2022)

On the Validation of Web X.509 Certificates by TLS Interception Products. - Ahmad Samer Wazan; Romain Laborde; David W. Chadwick; Rémi Venant; Abdelmalek Benzekri; Eddie Billoir; Omar Alfandi (IEEE Trans. Dependable Secur. Comput., 2022)

Establishing Trust in SSI Verifiers. - David W. Chadwick; Michael Kubach; Ioram Schechtman Sette; Isaac Henderson Johnson Jeyakumar (Open Identity Summit, 2023)

Enhancing the ACME Protocol to Automate the Management of All X.509 Web Certificates. - David A. Cordova Morales; Ahmad Samer Wazan; David W. Chadwick; Romain Laborde; April Rains Reyes Maramara; Kalil Cabral (SEC, 2023)

Enhancing the ACME protocol to automate the management of all X.509 web certificates (Extended version). - David A. Cordova Morales; Ahmad Samer Wazan; David W. Chadwick; Romain Laborde; April Rains Reyes Maramara (Comput. Commun., 2025)

On the interoperability of verifiable credentials: simple universal verifier (SUV). - Mustafa Kaiiali; Ioram Schechtman Sette; Ahmad Samer Wazan; David W. Chadwick; Omar Alfandi (Ann. des Télécommunications, 2025)