random captcha generator

Project Introduction Project address: Poke around here. The reason for this project is that the great God wants to participate in the hackmit, need them to identify 10000 pieces in 15000 verification code or each character's recognition accuracy

This PHP generated CAPTCHA code principle generates a random number--Create picture--random number in the picture--Save in session, look at the process verification code picture generation notification browser will output PNG picture ready random

Packageweb;ImportJava.awt.Color;ImportJava.awt.Font;ImportJava.awt.Graphics2D;ImportJava.awt.image.BufferedImage;Importjava.io.IOException;ImportJava.util.Random;ImportJavax.imageio.ImageIO;Importjavax.servlet.ServletException;ImportJavax.servlet.Ser

Refreshing the browser is normal. How to solve, what code can force the verification code re-loaded. Reply to discussion (solution) Add a js random parameter after the generated address, url?r=math.random () "> You add a non-cached header

Many systems now register, log in or publish information modules are added to the random code function, is to avoid automatic registration program or the use of automatic publishing programs. The verification code is actually randomly select some

The role of the CAPTCHA:1, to prevent advertising machine registration and posting, comments.2, to prevent brute force password, especially the password with administrator privileges.Here is a very useful verification code generation tool:

First, the principleThe verification code is actually a random string. The principle can be divided into two kinds:1. Simple Verification CodeGenerated directly from ASCII codes of letters and numbers. This is the verification code used in this

This article mainly introduces PHP generate a variety of random verification code method, combined with specific examples of the form of PHP commonly used to generate verification code operation related skills, and with the demo source for the

Python Verification code 6-bit Auto generator！ /usr/bin/env python#-*-coding:utf-8-*- ImportRandom tem="" forIinchRange (6): Digi= Random.randrange (0,11) ifDigi = = 1orDigi = = 5:## # # #当randrange (0,11) randomly generated number

Many systems now register, log in or publish information modules are added to the random code function, is to avoid automatic registration program or the use of automatic publishing programs. The verification code is actually randomly select some