Lattice-based group signature is an active research topic in recent years. Since the pioneering work by Gordon, Katz and Vaikuntanathan (Asiacrypt 2010), ten other schemes have been proposed, providing various improvements in terms of security, efficiency and functionality. However, in all known constructions, one has to fix the number N of group users in the setup stage, and as a consequence, ...

This study analyzes joint interaction behaviors of two-person and four-person standing conversations from three different cultures, American, Arab, and Mexican. To determine whether people use joint interaction behaviors differently in multiparty versus dyadic conversation, and how differences in culture affect this relationship, we examine differences in proxemics, speaker and listener gaze be...

Consider the problem of estimating, for every integer j, the number of households with j people in them, while protecting the privacy of individuals. Add in a geographical component, so that the household size distribution can be compared at the national, state, and county levels. This is an instance of the private hierarchical group size estimation problem, in which each group is associated wi...