TY - JOUR AU - El-Douh, Ahmed Abdel-Rahim AU - Lu, Song Feng AU - Elkouny, Abdelatif A. AU - Amein, A.S. TI - Hybrid cryptography with a one-time stamp to secure contact tracing for COVID-19 infection JO - International Journal of Applied Mathematics and Computer Science PY - 2022 SP - 139 EP - 146 VL - 32 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IJAMCS_2022_32_1_a10/ LA - en ID - IJAMCS_2022_32_1_a10 ER -