Author Archives: admin

Collaborative Study of Snooping on Mobile Phones Gets SOUPS Award

13483102_1026748250714486_8884387583233611527_oSOUPS ’16 paper on the prevalence of snooping on mobile phones has received Distinguished Paper award. The paper reports a series of quantitative studies that allowed a more accurate measurement of this phenomena. The study was led by our collaborators at the University of Lisbon. It was inspired by our previous study presented at Mobile CHI ’13. Continue reading

Sharing Health Information on Facebook Among Americans


Motivated by the benefits, people have used a variety of web-based services to share health information (HI) online. Among these services, Facebook, which enjoys the largest population of active subscribers, has become a common place for sharing various types of HI. At the same time, Facebook was shown to be vulnerable to various attacks, resulting in unintended information disclosure, privacy invasion, and information misuse. As such, Facebook users face the dilemma of benefiting from HI sharing and risking their privacy. In this SOUPS ’16 paper, we report our investigation of HI sharing practices, preferences, and risk perceptions among US Facebook users. Continue reading

How Much Can Chunking Help to Remember Banking PINs?

chunkingTo ensure that users do not choose weak personal identification numbers (PINs), many banks give out system-generated random PINs. 4-digit is the most commonly used PIN length, but 6-digit system-generated PINs are also becoming popular. The increased security we get from using system-generated PINs, however, comes at the cost of memorability. And while banks are increasingly adopting system-generated PINs, the impact on memorability of such PINs has not been studied.

In a collaboration among Honeywell ACS Labs, Sungkyunkwan University, Oregon State University, University of Illinois at Urbana-Champaign, and UBC, we conducted a large-scale online user study with 9,114 participants to investigate the impact of increased PIN length on the memorability of PINs, and whether number chunking techniques (breaking a single number into multiple smaller numbers) can be applied to improve memorability for larger PIN lengths. Our findings have been reported at SOUPS ’15. Continue reading