Why did you receive an inexplicable verification code?

The mobile phone inexplicably receives the verification code for the following reasons:

1. Mobile phone information leaked. The mobile phone number that receives the short message is generally the mobile phone number that is bound to the identity when registering. Under normal circumstances, personal information should be protected and not leaked at will to prevent property losses.

2. It is possible that someone else entered the wrong number, causing the verification code to be sent to their mobile phone.

3. The mobile phone may be infected with a virus, and others can directly obtain those verification codes.

Mobile phone verification code is the most effective verification code system by sending verification code to mobile phone. Large websites, especially shopping websites, provide SMS verification code function, which can accurately and safely ensure the safety of shopping and verify the correctness of users. Some authentication code providers provide SMS authentication code service. Each website sends a request to the provider's server through the interface, and the server sends random numbers or letters to the mobile phone, and the provider's server verifies the authentication code uniformly.

Captcha, abbreviated as CAPTCHA, is a public * * * fully automatic program, which is used to distinguish whether users are computers or people. The application of verification code is a common way adopted by many websites, which can not only prevent malicious password acquisition, ticket brushing and forum flooding, but also effectively prevent a hacker from constantly trying to use a specific program to log in to a specific registered user to make a breakthrough. Captcha questions are generated and judged by computers, but only humans can answer them. The computer can't answer the Captcha question, so the user who answers the question can be considered as human.