Recently, GPU computing power is being deployed, intending to increase computing power to 5-6 times the previous amount. More GPU computing power helps to recover password clues that could not be exhaustively searched before, such as masks that exceed 10 days. Previously, these were not calculated due to the long duration, unless all other password patterns had been tried and it was absolutely necessary to compute. Now it can be calculated in just 1-2 days, making it easier to get results. Of course, the costs incurred are also considerable.