What is Cai Yun SMS?

It means: give you the bound mobile phone number, send four or six digits to fill in the corresponding position. The verification code is a public automatic program, which is used to distinguish whether the user is a computer or a person. Prevent malicious password cracking, ticket brushing, forum flooding and page brushing.

Effectively prevent hackers from trying to log in to specific registered users by using specific programs to violently crack. In fact, using verification code is a popular way for many websites now, and we have realized this function in a relatively simple way.