1. Take advantage of the high traffic of existing websites (many of which are eye-catching improper websites) and let those passers-by help input the verification code for free.
2. Pay directly and use human resources to input the verification code, and send the verification code that needs to be identified to the net user for identification through software; Representative platform: Youyouyun
The role of verification code: effectively prevent hackers from using specific programs to constantly try to log in to specific registered users for violent cracking. In fact, using verification code is a popular way for many websites (such as online personal bank of China Merchants Bank and QQ community of Tencent), and we have also realized this function in a relatively simple way. Although it is a bit troublesome to log in, this function is necessary and important for the password security of netizens. However, we still remind everyone to protect their passwords, try to use passwords with more than 6 digits, letters and symbols, and don't use simple passwords such as 1234 or passwords that are the same as or similar to the user name. Don't set the password at will. Protecting your password is also protecting yourself, so as not to steal your account and bring yourself unnecessary trouble.
(1). The verification code is generally used to prevent batch registration, and it is difficult for people to see it, let alone the machine. Second, Baidu Post Bar does not log in or post. Probably to prevent the occurrence of large-scale anonymous replies. At present, many websites adopt verification code technology to prevent users from automatically registering, logging in and pouring water by robots. The so-called verification code is to generate a picture from a series of randomly generated numbers or symbols, and add some disturbing pixels to the picture (to prevent OCR). Users can identify the verification code information with naked eyes, enter the form and submit it to the website for verification. Only after the verification is successful can a function be used.
(2) General user ID registration places and major forums should enter verification codes.
(3). Universal verification code
1, four-digit, random one-digit string, the most original verification code, the verification effect is almost zero. 2.CSDN website users log in in GIF format, which is a commonly used random digital picture verification code. The characters in the picture are quite satisfactory, and the verification effect is better than the last one. People who don't have the basic knowledge of graphics and iconology can't be broken! Unfortunately, on the first day of using CSDN, the program to read it seems to have been published on the forum. What a pity!
2, Chinese characters, QQ website registration, the latest verification code, all Chinese characters, randomly generated, more difficult to type!
3. QQ website users log in in PNG format, and the random numbers used in the pictures are capitalized randomly. The whole composition is a bit grandiose, and every character will change his position every time he refreshes! Sometimes the pictures that come out can't be recognized by human eyes, which is amazing ... 4. When 4.MS applied for hotmail, it was in BMP format, and the random numbers were capitalized randomly, which randomly interfered with the random positions of pixels.
4. Korean or Japanese. Now it is more difficult to register for MS in HF, so it is necessary to take a course. ..
5. Google's Gmail is registered in JPG format, with random English letters, random colors, random locations and random lengths.
6. Other forums are random content in XBM format.
(4) Significance: Many websites use verification code technology to prevent users from automatically registering, logging in and pouring water by robots. The so-called verification code is to generate a picture from a series of randomly generated numbers or symbols, and add some disturbing pixels to the picture (to prevent OCR). Users can identify the verification code information with naked eyes, enter the form and submit it to the website for verification. Only after the verification is successful can a function be used.