The invention relates to a method for controlling a security system of a charging station for charging electric vehicles, the security system comprising the following elements: a charging plug, the charging plug comprising a sensor unit for recording biometric data of a user that are used for authenticating the user on the security system, and a control unit for evaluating biometric data of the user. For this purpose, according to the invention, the control unit extracts a plurality of features from the biometric data of the user, and the control unit evaluates the features of the biometric data in a plurality of stages.