Proximity-based software were modifying the way group interact with one another inside the real globe. To help people extend their particular social networking sites, proximity-based nearby-stranger (NS) apps that encourage people to make friends with regional strangers need gained popularity lately. As another common variety of proximity-based programs, some ridesharing (RS) apps letting motorists to look close individuals to get their ridesharing desires in addition recognition because of the sum to economy and emission decrease. Contained in this papers, we concentrate on the location privacy of proximity-based cellular apps. By analyzing the communication mechanism, we find that many applications of this kind were vulnerable to large-scale area spoofing assault (LLSA). We appropriately propose three solutions to performing LLSA. To judge the threat of LLSA presented to proximity-based mobile apps, we execute real-world circumstances reports against an NS application named Weibo and an RS software called Didi. The outcomes show that all of our methods can properly and instantly gather a big volume of people’ areas or travel documents, therefore showing the seriousness of LLSA. Continue reading »