A security authentication method and apparatus, a security authentication model training method and apparatus, and an electronic device. The security authentication method comprises: in response to a security authentication request for a target user, obtaining user behavior data of the target user within a preset time period (S102); obtaining a behavior feature sequence of the target user on the basis of the user behavior data (S104); inputting the behavior feature sequence of the target user into a security authentication model to obtain a security authentication result corresponding to the behavior feature sequence (S106), wherein the security authentication model is obtained by training based on multiple groups of behavior feature sequences of the target user within a historical time period.
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