Contact tracing query (CTQ) plays a crucial role in the prevention of epidemic diseases. In
real-world applications, user trajectory, encompassing a wealth of sensitive information, is …

With the expansion of mobile devices and cloud computing, massive spatial trajectory data
is generated and outsourced to the cloud for storage and analysis, enabling location-based …

With the expansion of cloud computing, its effectiveness in handling large datasets,
particularly trajectory, has become evident. However, due to the sensitivity of trajectory data …

In response to pandemics, transmission simulation models, contact tracing algorithms, and
risk assessment techniques are attracting extensive research attention. They are helpful in …

Private contact tracing (PCT) has been used in many applications including healthcare,
crime investigation, and bureaucracy. In this paper, we present a privacy-preserving …

With the rapid growing volume of spatial data, answering why-not questions on spatial
keyword top-k queries, aiming at refining spatial keyword queries to include the missing …

Private contact tracing (PCT) has been used in many applications including healthcare,
crime investigation, and bureaucracy. In this paper, we present a privacy-preserving …