As long as a round subkey generation function is not defined for Magma, we propose to search for possible weakening options. Consider the case when all the eight round subkeys take the same value. Since a single subkey has the length of 32 bits, there are 232 possible values for different secret keys from the entire key space of 2256. The search space for the key in these conditions is only 232. If slide attack is applied, the search space is contracted to 216 with the probability of 0.5 according to the birthday paradox.