Yiping Teng Zhan Shi Fanyou Zhao Guohui Ding Li Xu Chunlong Fan Signature-Based Secure Trajectory Similarity Search. 196-206 2021 TrustCom https://doi.org/10.1109/TrustCom53373.2021.00043 conf/trustcom/2021 db/conf/trustcom/trustcom2021.html#TengSZDXF21