How to display the verification code of mobile phone directly on the screen?

2. Second, find the status bar and notification, and then click.

3. Then, click the information option.

Finally, just select the top preview.

Extended data:

CAPTCHA is the abbreviation of "fully automatic public Turing test to distinguish between computer and human", and it is a public fully automatic program to distinguish between computer and human. It can prevent malicious password cracking, ticket brushing and forum flooding, and effectively prevent hackers from constantly trying to log in to specific registered users by using specific program brute force cracking methods.

In fact, using verification code is a popular way in 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. Because the computer can't answer the question of the verification code, the user who answers the question can be considered as human.

Verification code type:

Gif animation verification code

Mainstream verification codes are easily recognized by ocr software by providing static pictures. Some websites provide dynamic verification code pictures of gif, which makes it difficult for the recognizer to identify which layer is the real verification code picture. It can provide a clear picture and prevent the recognizer from recognizing it more effectively. According to statistics, the anti-spam injection rate of animated GIF captcha can reach 65,438+000%, which is a very effective captcha innovation mode. At the same time, there can be as many as 100 kinds of gif animation effects, which can also increase the aesthetic effect of website pages.

SMS verification code

By sending the verification code to the mobile phone, the mobile phone verification code is the most effective verification code system. Large websites, especially shopping websites, provide SMS verification code function, which can accurately and safely ensure shopping safety 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 verification code uniformly.

Mobile phone voice verification code

As long as the user's mobile phone or landline can answer the phone normally, he will certainly receive the voice verification code, which can realize automatic voice broadcast, and at the same time, short messages can be sent to the user's mobile phone at the same time, realizing double insurance and ensuring foolproof. If you fail to dial the voice verification code, the system can automatically replay it to ensure that no one is missed, which fundamentally solves the problem that your website users cannot receive the verification code.

Video verification code

The verification code composed of random numbers, letters and Chinese is dynamically embedded into videos in MP4, flv and other formats. The combination of letters and numbers, the shape and size of fonts, the speed, the display effect and the dynamic change of trajectory in the video all increase the difficulty of malicious screen grabbing. Its security is much higher than ordinary verification code, and this form of verification code will not make users feel bored. Because it improves the difficulty of machine identification, it can reduce the difficulty of user identification and make it easier for users to identify.

References:

Verification code (public automatic program) Baidu Encyclopedia