What is my verification code?

My verification code is SMS verification code. Verification code is a picture generated by a series of randomly generated numbers or symbols, which generally prevents batch registration.

Common verification code? Four-digit, random one-digit string, the most primitive verification code, the verification effect is almost zero. CSDN website users log in in GIF format. At present, the commonly used random digital picture verification code, the characters on the picture are quite satisfactory, and the verification effect is better than the last one.

Verification code can prevent

Malicious password cracking, ticket brushing and forum flooding can effectively prevent hackers from constantly trying to use specific programs to log in to specific registered users for violent cracking. In fact, using verification code is a popular way for many websites now, and we have realized this function in a relatively simple way. This question can be generated and judged by computers, but only humans can answer it.

In order to effectively prevent this problem, specific registered users keep trying to log in by using specific program cracking methods. In fact, verification code is a popular way in many websites, such as online personal banking of China Merchants Bank and QQ community of Tencent. We have implemented this function in a relatively simple way.