A METHOD FOR GENERATING A MODIFIED ONE-TIME PASSWORD ALLOWING TO AUTHENTICATE THE USER FOR WHICH IT HAS BEEN GENERATED

摘要

The invention related to a method for generating by a first device (330) a modified one-time password (303), the first device being operated by a user, the method comprising the steps of: providing a first one-time password OTP_P (303) generated by a generator (300) implemented by the first device and using a piece of data (302) as an input; providing by the user an authentication password (304); applying (305) a post-treatment function F which uses said one-time password OTP_P (303) and said authentication password (304) as inputs in order to generate as an output a modified one-time password M_OTP having the same format as OTP_P, the function F being chosen such that OTP_P is recoverable from said modified one-time password by applying the inverse function of F and if only the same authentication password as the one used for generating M_OTP is used as an input of said inverse function.