Tuong Ngoc Nguyen Willy Susilo Dung Hoang Duong Fuchun Guo Kazuhide Fukushima Shinsaku Kiyomoto Shrinkable Ring Signatures: It Wasn't Them! 75-93 2024 ISPEC https://doi.org/10.1007/978-981-97-9053-1_5 conf/ispec/2024 db/conf/ispec/ispec2024.html#NguyenSDGFK24 streams/conf/ispec