CS Other Presentations

Department of Computer Science - University of Cyprus

Besides Colloquiums, the Department of Computer Science at the University of Cyprus also holds Other Presentations (Research Seminars, PhD Defenses, Short Term Courses, Demonstrations, etc.). These presentations are given by scientists who aim to present preliminary results of their research work and/or other technical material. Other Presentations serve as a forum for educating Computer Science students and related announcements are disseminated to the Department of Computer Science (i.e., the csall list):
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Presentations Coordinator: Demetris Zeinalipour

PhD Defense: Personalized Cued-Recall Graphical User Authentication based on Image Content Familiarity, Mr. Argyris Constantinides (University of Cyprus, Cyprus), Tuesday, April 05, 2022, 12:00-13:00 EET.

The Department of Computer Science at the University of Cyprus cordially invites you to the PhD Defense entitled:

Personalized Cued-Recall Graphical User Authentication based on Image Content Familiarity

Speaker: Mr. Argyris Constantinides
Affiliation: University of Cyprus, Cyprus
Category: PhD Defense
Location: Zoom (with Registration), https://ucy.zoom.us/meeting/register/tJApdOuoqTMqHt0xfUCOoovJNBjKXZ4-ndcN (directions)
Date: Tuesday, April 05, 2022
Time: 12:00-13:00 EET
Host: Dr. Vasos Vassiliou (vasosv-AT-cs.ucy.ac.cy)
URL: https://www.cs.ucy.ac.cy/colloquium/presentations.php#cs.ucy.pres.2022.constantinides

User authentication is an essential security task performed daily by millions of users across the globe. Traditional user authentication solutions utilize text-based passwords, which require users to memorize a sequence of alphanumeric characters. However, memorizing strong text-based passwords often leads to poor usability and limited security. To offer a better trade-off between security and usability, prior works proposed various graphical user authentication (GUA) schemes, which require users to complete an image-based task to authenticate. Within this realm, cued-recall GUA schemes require users to draw selections on images as their secret password, with the image acting as a cue intended to reduce the memory load on users and ultimately assist them with the recall of information. Nevertheless, cued-recall GUA schemes typically provide globalized "one-size-fits-all" solutions without taking into consideration that people have diverse prior sociocultural activities, experiences, and declarative memories. This thesis proposes a new cued-recall GUA framework, coined RetroPass, by leveraging on users’ sociocultural experiences for the delivery of personalized images. These images are defined at different levels of abstraction (i.e., Individual, Group, Organizational, National, Global), thus, expanding the state-of-the-art narrow spectrum of using either too generic or too personal image content. The thesis contributes to the emerging interdisciplinary research field of Human-Computer Interaction and Security, and its high-level objectives are: (i) Investigate and model the effects of image content familiarity on the security and usability of cued-recall graphical passwords, supported by a series of ecologically valid user studies, and quantitative and qualitative metrics; (ii) Design and develop RetroPass, a personalization cued-recall GUA framework that delivers "best-fit" image content to each user; and (iii) Conduct a summative evaluation of RetroPass in an ecologically valid user study with the aim to examine the added value of the framework in terms of user performance and acceptance with relation to personalized graphical user authentication.

Short Bio:
Argyris Constantinides is a Ph.D. candidate at the Department of Computer Science, University of Cyprus, under the supervision of Dr. Andreas Pitsillides, and CTO of Cognitive UX LTD. He holds a M.Sc. in Web Science and Big Data Analytics from the University College London, UK (2015), and a B.Sc. in Computer Science from the University of Cyprus, CY (2014). His research interests revolve around the areas of Human-Computer Interaction, Usable Security, and Intelligent User Interfaces. He has professional experience as a researcher and software engineer in EU and National research projects. In the past, he has worked as a software and infrastructure engineer at Playtech BGT Sports, London, UK (2015-2017).

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