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Recently, a lot of Biometric Authentication Systems (BAS) techniques for the purpose of security in both industrial and academic organizations because it improves the authentication system's usability by overcoming the existing difficulties of using passwords. Although of the rapid spread of BAS's systems especially in smartphones, it still has defects and are subjected to attacks, and suffers from the intrusion of user privacy, because some biometric features have not been deeply studied and investigated. In this survey, the existing BAS techniques are explored and classified focusing on the security issues that they are used for and the corresponding solutions provided in this domain. The advantages and disadvantages of each BAS technique are also reviewed, the threats of each BAS technique are listed, summarized, and discussed. The relevant research studies are also presented and several open problems, research direction are also presented.

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