Method for transmitting security data and method for receiving same

According to one embodiment of the present specification, a method for transmitting security data is disclosed. The method for transmitting security data can comprise the steps of: outputting a first sequence by scrambling a bit stream of dummy data; outputting a second sequence by scrambling the security data to be transmitted by using the bit stream; and transmitting a first code word and a second code word obtained by encoding the first sequence and the second sequence.