It is a fast hit but has a slight delay between USES, making it slightly slower than normal attack.

The limit that space domain only be applied in LSB under gray image of digital watermark was changed. Then, experiment showed that the method have a better adaptability to normal attack.

In enforcing PCI compliance - ensure that due diligence is ensured through tracking of failed login attempts and identifying what is the normal amount and what constitutes a system under attack.