Disputation: Xiaojie Zhu

Doctoral candidate Xiaojie Zhu at the Department of informatics, Faculty of Mathematics and Natural Sciences, is defending the thesis Privacy-preserving computation over outsourced dataset for the degree of Philosophiae Doctor.

Picture of the candidate

Photo: Private

The PhD defence and trial lecture will be fully digital and streamed directly using Zoom. The host of the session will moderate the technicalities while the chair of the defence will moderate the disputation.

Ex auditorio questions: the chair of the defence will invite the audience to ask ex auditorio questions either written or oral. This can be requested by clicking 'Participants -> Raise hand'. 

Trial lecture

Title: "Attribute Based Access Control Systems"



Main research findings

  • With the popularity of cloud services, privacy-preserving computation over outsourced data is increasingly becoming important. One example is the outsourced location-based service where the location service provider outsources its data to a cloud service provider and provides location-based services to clients through offered cloud services. Another example is the outsourced genomic data-driven service. Hospitals outsource their patients’ data to a cloud service provider and serve patients, physicians, and researchers with the outsourced data. In both examples, the cloud service provider stores and processes the outsourced data. To prevent the cloud service provider from learning the outsourced data, we propose a privacy-preserving framework for outsourcing location-based service and a privacy-preserving framework for outsourcing genomic data-driven service. Both proposed frameworks allow the cloud service provider to store the outsourced data and deal with the service requests without violating data privacy. We validate both frameworks through formal analysis and experiments over the real dataset. The findings of this dissertation have been published in a reputed journal.

Adjudication committee:


  • Professor Xiaofeng Wang, Indiana University, USA
  • Dr. Melek Önen, EURECOM, France
  • Associate Professor Christian Johansen, Department of Informatics, University of Oslo, Norway


  • Professor Roman Vitenberg, Department of Informatics, UiO
  • Assistant Professor Erman Ayday, Department of Electrical Engineering and Computer Science/Case Western Reserve University
  • Professor Frank Eliassen, Department of Informatics, UIO

Associate Professor Ingrid Chieh Yu, Department of Informatics, UiO

Contact information to Department: Mozhdeh Sheibani Harat

Publisert 15. sep. 2021 14:22 - Sist endret 15. sep. 2021 14:35