The invention relates to a method for securing an authentication of a mobile identification transmitter (200) in an access system (2) of a vehicle (1), preferably for detecting a relay attack, the following steps being carried out: a) initiating a signal transmission (D) between at least one communication module (110) on the vehicle (1) and the identification transmitter (200) as a function of an activation signal (S.1), b) determining a security feature (M) by the identification transmitter (200) on the basis of the signal transmission (D), c ) Suppression of the authentication by the identification transmitter (200) as a function of the security feature (M).
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