How PCs can break CAPTCHAs
A programmer wishing to break this CAPTCHA could approach the problem in phases. He or she would need to write an algorithm — a set of instructions that directs a machine to follow a certain series of steps. In this scenario, one step might be to convert the image in grayscale. That means the application removes all the color from the image, taking away one of the levels of obfuscation the CAPTCHA employs.
Next, the algorithm might tell the computer to detect patterns in the black and white image. The program compares each pattern to a normal letter, looking for matches. If the program can only match a few of the letters, it might cross reference those letters with a database of English words. Then it would plug in likely candidates into the submit field. This approach can be surprisingly effective. It might not work 100 percent of the time, but it can work often enough to be worthwhile to spammers.
What about more complex CAPTCHAs? The Gimpy captcha generator displays 10 English words with warped fonts across an irregular background. The CAPTCHA arranges the words in pairs and the words of each pair overlap one another. Users have to type in three correct words in order to move forward. How reliable is this approach?
As it turns out, with the right CAPTCHA-cracking algorithm, it’s not terribly reliable. While that’s far from perfect, it’s also significant. Spammers can afford to have only one-third of their attempts succeed if they set bots to break CAPTCHAs several hundred times every minute. Be cautious with pictures that seem to have spaces between the letters, the vast majority of them don’t! You will just need to type space on pictures that has 2 words. Just spotlight on fundamental content there are a few pictures that seem to have little estimated content at the best or at the base. Abstain from writing this little content! Just write the bigger and most unmistakable substance of the picture. To know more about anticaptcha log on to http://deathbycaptcha.com.