Among the smartphone user authentication schemes proposed recently, a number of user authentication
schemes using fingerprint, iris, face, voice, and ear shape feature information that using different biologic
characteristics for each person have been proposed. Due to the development of smart device and sensor
hardware technology, processing time for biometric information is similar to processing time for
conventional text or graphical user authentication schemes. In addition, these schemes maximize user
convenience because body-based information characteristic. Thus they do not require any more confidential
information for additional passcode input. In this paper, we analyze the recently proposed biometric
schemes applicable to smart phones. Then we introduce and analyze the recent types of social engineering
attacks in smartphone environments, and also analyze the security levels of conventional biometric schemes
for smartphones that against social engineering attacks. In addition, as a comparative study of the
biometrics, we analyze conventional non-biometric authentication schemes for smartphones against social engineering attacks. Then we show vulnerability and countermeasures of each biometric authentication
schemes against social engineering attacks.