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To embody the concept of network multiple-input multiple-output, cell-free massive multiple-input multiple-output employs a great deal of geographically distributed access points, which jointly serve multiple users in the same frequency-time resource. Assuming a malicious active eavesdropper having knowledge of instantaneous channel state information, we derive the asymptotic closed-form expression of the achievable secrecy rate, which is used to evaluate network security performance. A distributed power allocation scheme is developed based on channel fading degrees of different users. All of access points distribute a larger proportion of local transmission power to the users with better channel conditions. We verified that the security performance of the multi-antenna access points outperforms that of the single one. Compared to equal power allocation, the proposed power control algorithm can further boost the network security performance. <\/jats:p>","DOI":"10.1177\/15501329221114535","type":"journal-article","created":{"date-parts":[[2022,8,23]],"date-time":"2022-08-23T09:45:43Z","timestamp":1661247943000},"page":"155013292211145","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["Security performance analysis for cell-free massive multiple-input multiple-output system with multi-antenna access points deployment in presence of active eavesdropping"],"prefix":"10.1177","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7767-2145","authenticated-orcid":false,"given":"Xiaoyu","family":"Wang","sequence":"first","affiliation":[{"name":"Army Engineering University of PLA, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuanyuan","family":"Gao","sequence":"additional","affiliation":[{"name":"Army Engineering University of PLA, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guangna","family":"Zhang","sequence":"additional","affiliation":[{"name":"Army Engineering University of PLA, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mingxi","family":"Guo","sequence":"additional","affiliation":[{"name":"Army Engineering University of PLA, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kui","family":"Xu","sequence":"additional","affiliation":[{"name":"Army Engineering University of PLA, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2022,8,23]]},"reference":[{"key":"bibr1-15501329221114535","unstructured":"Telatar IE. 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