How many digits is the verification code that is easy to swim?

And the validity period is only 15 minutes.

The main function of verification code is to prevent ticket brushing, forum irrigation and page brushing.

Prevent hackers from maliciously cracking passwords and stealing user data.

The verification code usually consists of some lines and some irregular characters, and its main function is to prevent some hackers from stealing password data.

Effectively prevent hackers from constantly trying to use specific programs to log in to specific registered users to crack. In fact, the use of verification code is a common way adopted by many websites (such as online personal banking of China Merchants Bank and Baidu Community), and people have realized this function in a relatively simple way.

Although logging in is a bit troublesome, this function is necessary and important for the password security of netizens.

Prevent malicious registration and login.

Verification code is generally used to prevent batch registration, which is difficult for people to see, let alone machines.

Almost all formal forums require users to enter the verification code when registering, so as to prevent spammers from maliciously registering with the registration machine.