human verification code

When I recently studied PIL, I studied the verification code by the way. The verification code is generally used in registration, speech, modification of information, and other places. Its role is to prevent malicious submission of users from wasting resources or information attacks. There are several methods to crack

A simple color background graphic verification code and graphic Verification Code Namespace to be added first Using System. Web. UI. WebControls;Using System. Drawing. Drawing2D;Using System. Drawing. Imaging; Compile a method to generate a Random number. This method is very simple. The returned result is a string tha

This article mainly explains how to generate an image verification code in php, including a digital verification code, a digital and letter verification code, a Chinese verification

$ (". Login"). Live (' click ', function () { var username=$ (". Input_user"). Val (); var password=$ (". Input_ps"). Val (); var code=$ ('. Input_checkcode '). Val (); if (username== "") { Alert ("User name cannot be empty"); return false; } if (password== "") { Alert ("Password cannot be null"); return false; } var url= "checklogin.php?"; var data= "username=" +username+ "password=" +p

ASP. NET Verification Code (3 types) and asp.net Verification Code (3 types) In daily life, we encounter verification codes when using websites. Have you ever wondered why you should use the verification codes? In fact, the purpos

Php id card verification code calculation method and php verification code calculation method The meaning of each Chinese (Mainland) citizen ID card number is described in many articles on the Internet. The last digit of the ID card number is the verification

Java Development --- verification code, java --- Verification Code Verification Code: prevents malicious password cracking, ticket swiping, Forum bumping, and page swiping. This effectively prevents hackers from constantly trying

People know that simple numbers or letter verification code can easily be cracked, but the formula verification code or Chinese character verification code is not easy to be cracked,Therefore, we recommend that you use the

Verification Code countdown helps implement CountDownButtonHelper and cell phone Verification Code countdown Reprinted please indicate the source: http://blog.csdn.net/zhaokaiqiang1992 When we do the text message verification code

The Kaptcha verification code is Google's verification code plugin, which is relatively simple to use, the interference lines set and the font distortion is not easy for others to read the hack.Here we need to import a Kaptcha-2.3.jar: Http://pan.baidu.com/s/1dDzw7BjThere is a kaptchaservlet servlet in the jar package,

PHP generates a simple example to create a verification code and a php verification code instance. PHP generates a simple example to create a verification code. after reading the php verificat