In this challenge, the message is a file that contains the cryptographic phrase and enc.py is the encrypted file. By considering the encrypted file, we realize that the cryptographic is Morse code. we write the encoder. The file name is dec.py. then according to the structure of the output expression, especially SBCTF, which is the initial part of the flag, we find out this is a 20-digit cipher and by returning it we get the final answer.