Adding hint where the stream cipher coefficients come from

chapter_three/Stromchiffre.py

@@ -46,6 +46,8 @@ def decrypt_text(cipher_bits: str, coefficients: [int], key: [int]) -> str:
 def get_optimal_shift_register_coefficients(size: int) -> [int]:
 	"""
 	Returns a set of coefficients for a linear shift register with the given size that guarantees a maximum bit stream.
+
+	The coefficients are taken from the following page: https://www.eng.auburn.edu/~strouce/class/elec6250/LFSRs.pdf
 	:param size: The size of the linear shift register
 	:return: The optimal coefficients
 	"""