Captcha is an automated security which is used to decide whether the web page is being used by the humans are the robots. It is a technology which present robots cannot pass through and is completely of puzzles, problems and pictures which humans can easily understand and pass through to it. The problems which are highly unsolvable to sort out are made easy for the highly successful for captcha which is designed to solve artificial intelligence problems Humans introduce a robotic test which present computers pass through and humans can easily have access through it. The problems which are highly unsolvable can be solved using captcha which have high success on artificial intelligence.
Uses of Captcha: –
Captcha is used to decide whether you are human are robot. It provides a puzzle which is difficult for computer and easy for humans to understand. If the puzzle is solved, you are considered as human if not, it is considered as robot. This consist of Online polls, Free email services which is helpful for creating an email and helps to eliminate bugs, Search engine bots are used for searching web and provide secure information which is spam free, this can Prevent worms and spams, Preventing dictionary attack by providing the sequence of letters in the dictionary in random form, which cannot be found in the dictionary this prevents attack of artificial intelligence.
It is available in form of: –
· captcha which is in printed form is difficult to break
· lots of algorithms are present in market to generate this kind of captcha
· Identification of this is very easy for human
Types of text: –
· Baffle text uses pronounceable English characters which are not present in English dictionary
· Pessimal text uses printing and scanning of printed text
· Hand written captcha which is in the form of written text which is difficult for bots to understand.
· Uses of transformations by adding lines, arcs, circles etc.
It is automatically generated by the systems using AJAX and PHP. This test can be taken by humans easily and quickly. This virtually accepts all humans and reject software agents and will resist automatic attack.
Design of captcha: –
This is user friendly for humans. Which is interactive for people and doesn’t have any problem with it. These codes are generated in AJAX and PHP Technology. Which is usually done by every company because any bots cannot pass through it and make violation in it. This is mainly developed in the software companies to maintain secure data. At present captcha is playing a main role in the software companies
This helps to vary difference between humans and bots, which is now a major problem faced by every human. So, captcha is providing a secure web browsing by introducing the different kinds of security. It is a technology which present robots cannot pass through and is completely of puzzles, problems and pictures which humans can easily understand and pass through to it. Using captcha, now a day the crime rate had decreased. This has become an essential thing in every ones life because it is providing us with the secure information. Breaking captcha code is very tough. Without selecting appropriate captcha codes it is not easy to enter a web application. If you have entered a wrong captcha it repeatedly change the words and ask you to enter the correct code. So