Password strength calculator

The network is too dangerous and the bad guys are too rampant! We should use a more secure password, either because of the site requirements, or in our own security. However, the complex, hard to remember password is not guaranteed to be safe. For example: "Passw0rd1!", Capital, lowercase, numbers, symbols all, and the length of 10; fully meet the password complexity requirements. But its security is very poor, because the bad guys also study everyone's habits, the password is estimated to be within 20000 attempts will be cracked. On a modern computer, this means that it does not need a second! This tool uses the algorithm developed by Dropbox which refer to a similar process of password cracking to estimate the time it takes cracking a password. To help users choose password with appropriate balance between easy to remember and security. At the same time, based on more than 800 million large data, for a specific account name or e-mail address, this tool can give dangerous password which should not be used.