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At present, many protocols have been proposed, but these protocols are inefficient and ignore some security risks. In the paper, we present a new location-sharing protocol, which solves two issues by using symmetric\/asymmetric encryption properly. We adopt the following methods to reduce the communication and computation costs: only setting up one location server; connecting social network server and location server directly instead of through cellular towers; avoiding broadcast encryption. We introduce dummy identities to protect users\u2019 identity privacy, and prevent location server from inferring users\u2019 activity tracks by updating dummy identities in time. The details of security and performance analysis with related protocols show that our protocol enjoys two advantages: (1) it\u2019s more efficient than related protocols, which greatly reduces the computation and communication costs; (2) it satisfies all security goals; however, most previous protocols only meet some security goals.<\/jats:p>","DOI":"10.1186\/s13638-021-01999-z","type":"journal-article","created":{"date-parts":[[2021,5,17]],"date-time":"2021-05-17T11:02:56Z","timestamp":1621249376000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Location-sharing protocol for privacy protection in mobile online social networks"],"prefix":"10.1186","volume":"2021","author":[{"given":"Ou","family":"Ruan","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lixiao","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuanyuan","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,5,17]]},"reference":[{"key":"1999_CR1","doi-asserted-by":"publisher","first-page":"476","DOI":"10.1016\/j.ins.2020.06.026","volume":"542","author":"Y Chen","year":"2021","unstructured":"Y. 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