What is China Mobile's dynamic verification code for handling traffic?

China Mobile's dynamic verification code for handling traffic is that the bound mobile phone sends a 6-digit number and inputs it. According to the relevant display of the query, write the mobile phone number and click Get Verification Code. The website server automatically generates a random number as a verification code and records it temporarily. At the same time, the short message content and the user's mobile phone number are submitted to the service provider through the verification code short message interface, and the service provider immediately sends the short message to the user's mobile phone. After receiving the short message, the user fills in the verification code, and then compares the verification code filled in by the user with the verification code generated by the server. If they are consistent, the verification is successful.