- Security Analysis of IoT Enabling Technologies, The 8th International Conference on Internet of Things (iThings 2015), during 11-13 Dec. 2015, Sydney, Australia (Keynote).
- Privacy Preserving Social Network Data Publication, 4th Cyber Security Symposium (CSS 2015), NSW, Australia (Keynote).
- Knowledge-Free Hybrid Cloud Resource Provisioning, International Conference on Advanced Data and Information Engineering (DaEng-2015), Bali, Indonesia (Keynote).
- Hybrid Consensus Pruning of Ensemble Classifiers for Big Data Malware Detection,2015 IEEE International Conference on Big Data and Cloud Computing (BdCloud), 03 Dec - 05 Dec 2014, Sydney, Australia (Keynote).
- Failure-aware Hybrid Cloud Computing Resource Provisioning Approach, International Workshop on Dependable and Secure Cloud Computing Architecture in conjunction with 11th Working IEEE/IFIP Conference on Software Architecture (WICSA 2014), April 7, 2014, Sydney, Australia (Keynote).
- Workshop on Big Data, Yogyakarta State University (YSU), Yogyakarta, Indonesia, February 2015 (Workshop).
- An Overview of Big Data: Opportunities and Challenges (2014), 12th Australasian Symposium on Parallel and Distributed Computing (AusPDC 2014), Auckland, New Zealand (Keynote).
- Hybrid Resource Allocation Techniques for Cloud Computing Systems (2014), International Conference on Advances in Computing, Communications and Informatics (ICACCI-2014), Delhi, 24-27 September 2014 (Keynote).
- Reliability and Security Aware Hybrid Resource Allocation Techniques for Cloud Computing Systems (2014), International Research Workshop on Cloud Computing (RWCC-2014), Jawaharlal Nehru University, Delhi, 26 September 2014 (Keynote).
- Comprehensive Analysis of Big Data: Technologies, Challenges and Opportunities, 5th International Conference on the Next Generation Information Technology Summit (Confluence 2014), September 25-26, 2014. (Keynote)
- Reliability-aware Resource Provisioning Approach for Cloud Computing, International Symposium on Big Data and Cloud Computing Challenges (ISBCC-2014), March 27-28, 2014, VIT University, Chennai, India (Keynote).
- Parallel and Distributed Computing Research, Auckland University of Technology, Auckland, Newzealand, 24 January 2014 (Seminar).
- The 3rd IEEE International conference on Advances in Computing, Communications & Informatics, 22-25 August 2013, Mysore, India (Keynote).
- Symbiosis of Big Data and Cloud Computing: Technologies, Challenges and Opportunities, Second IEEE International Conference on Advances in Cloud Computing (ACC 2013), 19-20 September 2013, Bangalore, India (Keynote).
- Big Data Analytics: A Comprehensive Analysis of Big Data Variety Characteristics, IEEE International Conference on Computing, Cybernetics and Intelligent Information System, 21-23 November 2013, Vellore, India (Keynote).
- Big Data Analytics: Challenges and Opportunities (2013) International Conference on Mathematical Computer Engineering (ICMCE 2013), Chennai, India, November 29 – 30, 2013 (Keynote).
- Big Data in Complex System: Challenges and Opportunities (2013), 2nd International Conference on Design and Application of Structures, Drives, Communicational and Computing Systems-KLN College of Information Technology-Madurai- 29-30th November 2013 (Keynote).
- Security Challenges in Big Data Analytics (2013), Workshop on Security in Cloud Computing, VIT University Chennai Campus, Chennai, India, November 29 – 30, 2013 (Keynote).
- Big Data Analytics: Challenges and Opportunities, Chief Guest Speaker, 2nd International Conference on Design and Application of Structures, Drives, Communicational and Computing Systems-KLN College of Information Technology-Madurai- 29-30th November 2013(Keynote).
- Reliable Cloud Computing Resource Provisioning, Conference on Cloud Computing, Government College of Engineering, Salem, 24th November 2013 (Keynote).
- Big Data Intelligence: Opportunities & Challenges, Computer Science and Engineering, Siddaganga Institute of Technology, 20 September 2013, Tumkur Karnataka, India (Invited Talk).
- The 3rd International Conference on Software Engineering and Computer Systems, Aug. 2013, Malaysia (Keynote).
- The 2013 International Conference on Computer Science and Information Technology (CSIT-2013), June 16-18, 2013, Yogyakarta, Indonesia.
- Reliability and Security in Hybrid Cloud Computing (2013), 2013 International workshop on Cloud Computing and SOA Testing, 24-27 April 2013, Melmaruvathur, India (Keynote).
- Security Challenges in Cloud Computing and Big Data (2013), Workshop on Security in Cloud Computing, VIT University Chennai Campus, Chennai, India, November 29 – 30, 2013(Keynote).
- Green Hybrid Cloud Resource Provisioning Policy in the Presence of Resource Failures (2013), Faculty of Computer Science and Information Technology, Universiti Putra Malaysia, Kuala Lumpur, Malaysia, 22 April 2013(Invited Talk).
- The 2012 IEEE International Conference on RADAR, Communication and Computing in Computer Science and Engineering, December 20-22, 2012, Chennai, Tamilnadu, India (Keynote).
- The 2012 International Conference on Advanced Information Technology & Sensor Application, Korea (Keynote).
- IEEE International Conference on RADAR, Communication and Computing (ICRCC-12), Tiruvannamalai, Chennai, India, December 21-22, 2012 (Keynote).
- Dynamic Service-Driven Trust/Credential Management for InterGrid Computing (2012), The 6th International Conference on Information Security and Assurance, April 28-30, 2012, Shanghai, China (Keynote).
- Cloud-based Networked RFID Systems (2012), The 2012 International Conference on Software Engineering and Mobile Application Modelling and Development (ICSEMA-2012), December 19-22, 2012, Chennai, Tamilnadu, India (Keynote).
- Cloud Computing: Challenges & Opportunities (2012), SASTRA University, Tirumalaisamudram, Thanjavur, Tamilnadu, India, 17 December 2012 (Seminar).
- The 2012 International Conference on Computer and Applications, March 30-31, 2012, Seoul, Korea (Keynote).
- Green Cloud Computing: A Vision, Architectural Elements, and Open Challenges (2011), Department of Computer Science, International Islamic University Malaysia (IIUM), Jalan Gombak, 53100, Kuala Lumpur, MALAYSIA, 13 December, 2011(Invited Talk).
- Information Assurance: Information System Auditing (2011), Faculty of Information Management, University Technology Mara, Malaysia, 4th July 2011(invited talk).
- How to Publish in High Impact Venues (2011), Faculty of Information Management, University Tun Hussein Onn Malaysia (UTHM), Malaysia (invited talk), 27th June 2011.
- Information Security Issues in Cloud Computing (2011), Faculty of Information Management, University Technology Mara, Malaysia, 4th July 2011, (invited talk).
- Secure Resource Management and Scheduling on Cloud Computing Environments, International Conference on Security-enriched Urban Computing and Smart Grid (SUComS), September 15 - 17, 2010, Daejeon, Korea (Keynote)
- The 4th workshop on Ubiquitous Computing and Emerging Intelligent Multimedia Paradigm, December 16, 2007, Cairo, Egypt (Keynote)
- Securing Your Organization's Information in the Digital Age, Ark Group, 7 December 2007, Crowne Plaza Darling Harbour, Sydney
- Wireless Computing:: Trends, Challenges, Technology and Applications, Seminar, University Putra Malaysia (UPM), Kula Lampur, July 2007.
- Conceptualising a Research Question, University Tun Hussein Onn, Batu Pahat, Johor, Malaysia, July 2007 (invited talk).
- Grid and Pervasive Computing: Trends, Challenges, Technology and Applications, one day workshop, University Tun Hussein Onn, Batu Pahat, Johor, Malaysia, July 2007 (invited talk).
- Grid and Pervasive Computing: Trends, Challenges, Technology and Applications, Keynote Talk, 12th International CSI Computer Conference (CSICC'07), Tehran, 20 February 2007.
- Localized Sensor Node Duty-Scheduling Approaches, Invited Talk, International Conference on Multimedia and Ubiquitous Engineering (MUE2007), Seoul Olympic Parktel, Seoul, Korea, April 26th ~ 28th, 2007 (Keynote).
- Mobile and Pervasive Computing: Trends, Challenges, Technology and Applications, Workshop, February 24, 2007, School of Computer Science, IPM, Tehran, Iran (invited talk).
- Grid Computing: Resource Management, Scheduling and Security, Workshop, February 22, 2007, Amirkabir University of Technology, School of Computer Science, Tehran, Iran (invited talk).
- Trusted Grid Information Service Infrastructure, RMIT University, 28 July 2006 (invited talk).
- Dynamic Resource Management Infrastructure for Enterprise Grid Computing, Seminar, Deakin University, Burwood Campus, 22 April 2006 (invited talk).
- Discovering Reputable Services in Pervasive Computing Environments, Seminar, Applied Security Seminar, Deakin University, Burwood Campus, Friday Sept 5, 2006.
- Reputation-Enabled Service-Oriented Grid Information Service, Seminar,Intelligent Systems Research Lab. Deakin University, Geelong Campus, Victoria, Australia, Wed 22 March 2006 (invited talk).
- Managing User Credentials in Large-scale Heterogeneous Distributed Systems, Seminar, Applied Security Seminar, Deakin University, Burwood Campus, Friday Sept 2, 2005.
- Job Scheduling Approach in High Throughput Computing – Part I,” Seminar, School of Information Technology Seminar, Deakin University, Wurn Ponds, Geelong, Wed 8th June, 2005 (invited talk).
- Job Scheduling Approach in High Throughput Computing – Part II, Seminar, School of Information Technology Seminar, Deakin University, Wurn Ponds, Geelong, Wed 8th June, 2005 (invited talk).
- Parallel Job Scheduling in High Performance Computing Environments,
- Seminar, School of Information Technology Seminar, Deakin University, Burwood Campus, Friday Sept 2, 2005 (invited talk).
- Secure Accounting and Payment Service for Grid Computing, Seminar, School of Information Technology Seminar, Deakin University, Burwood Campus, Friday Sept 16, 2005 (invited talk).
- Accounting Service for Service-Oriented Grid Computing, Seminar, School of Information Technology Seminar, Deakin University, Wurn Ponds, Geelong, 8th June, 2004 (invited talk).
- Grid Computing Accounting Challenges, Invited Talk, the International Workshop on Scientific Applications on Grid Computing (SAG'04), Beijing, China, September 20-24, 2004 (Keynote).