Method for secure communication, method for determining the secure information, transmitter

Disclosed is a method of secure communication in a transmitter comprising the following steps of: determining a method of generating a receiver and a unique training sequence; generating the unique training sequence based on the method of generating the unique training sequence by using secret information; and communicating with the receiver based on channel information derived from the unique training sequence. [Reference numerals] (410) Transmitter; (420) Receiver; (430) Determining a method for generating a unique training sequence; (440,450) Generating the unique training sequence; (460,470) Deriving channel information from the unique training sequence; (480) Communicating with the receiver by using the channel information derived from the unique training sequence