Trace-Σ: a privacy-preserving contact tracing app. - Jean-François Biasse; Sriram Chellappan; Sherzod Kariev; Noyem Khan; Lynette Menezes; Efe Seyitoglu; Charurut Somboonwit; Attila A. Yavuz (IACR Cryptol. ePrint Arch., 2020)