Methods and user device and authenticator device for authentication of the user device

摘要: (57) ABSTRACT A method and a user device (110) for authentication of the user device (110) as well as a method and an authenticator device (120) for authentication of the user device (110) are disclosed. The user device (110) generates (A030) a one time password. The user device (110) sends (A040), to an authenticator device (120), the one-time password as an acoustic signal, wherein the acoustic signal comprises a frequency within an ultrasound range or an infrasound range. The authenticator device (120) receives (A050), from the user device (110), the one-time password. The authen ticator device (120) validates (A060) the one-time password.