What Is CAPTCHA And How Does It Work?
What Is CAPTCHA And How Does It Work?
Surely people are familiar when they log into an account and are asked to enter their credentials. To prove you're not a robot. The system that manages all of that is called CAPTCHA. But many of us still don't understand what CAPTCHA is and how it works.
What are CAPTCHAs?
CAPTCHA stands for Completely Automated Public Turing Test to Tell Computers and Humans. By determining whether the user is genuine or a spambot. The standard Turing test involves a real person grading the subject. Whereas CAPTCHAs are not, they are generally managed by the computer.
Because of this, some call them “Reverse Turing Tests”, while others know them as Human Interaction Proof (HIP). It is not known exactly who created CAPTCHA, although the term was coined by Carnegie Mellon University, Pittsburgh, in 2003.
CAPTCHAs are used as a security check to prevent spammers and hackers from using forms on web pages to enter malicious code and other services that require registration from search engine bots, spam worms and robots, and dictionary attacks. They can also be useful in fighting Distributed Denial of Service (DDoS) attacks.
How Do CAPTCHAs Work?
As mentioned earlier CAPTCHA is a kind of Turing test. In simple terms, end users are asked to perform some tasks that software bots cannot. These tests often involve JPEG or GIF images, since bots cannot identify the presence of an image by reading the source code, they cannot determine the image depicted. Because some CAPTCHA images are difficult to interpret, users are usually given the option of requesting a new test.
Advantages of Using CAPTCHA
* Spam prevention from automated programs that can send emails, comments or advertisements.
* Prevention of fake registrations or registrations for websites.
* Most people know what a CAPTCHA is, so website visitors will automatically understand what they are assigned to do.
* CAPTCHA is also easy to implement in building websites.
Disadvantages of Using CAPTCHA
* CAPTCHAs are insecure, and can only limit spam.
* Can be time consuming or annoying for the user.
* For some people, CAPTCHAs can be difficult to read.
* Websites using CAPTCHAs may view traffic rules due to difficulties or distractions from users.
The difference between CAPTCHA and reCAPTCHA
Most of the CAPTCHA you see are actually reCAPTCHA. The latter does the same job as the former, but goes beyond this by also advancing machine learning. What's more, reCAPTCHA is used for digitization of books.
They were developed by the same team from Carnegie Mellon University who gave up the term "CAPTCHA". The open-source software aims to “preserve literature by deciphering words that computers cannot read”. Effectively, every time you parse a word found in reCAPTCHA, it's used for machine learning. You guys help the program understand various shapes and symbol patterns.
CAPTCHAs are random combinations, whereas reCAPTCHA consists of targeted words that bots have not been able to analyze before. reCACPTCHA itself was released in 2007 and acquired by Google in 2009. Just two years after the acquisition, this technology completely digitized the archives of Google Books and The New York Times. Both are invaluable repositories of information.
You may have wondered what happens when you click “I'm not a robot” and just move on, without explaining anything? The new Google reCAPCTHA analyzes your activity across the site then secretly gives you a probability score to determine if you are human or a bot. Basically, this all works out when your interaction with the service is more like a real person or program.
So what are CAPTCHAs? CAPTCHA is a turing test or human response test, to determine if a user is genuine or a spambot. Because as bots get smarter, security systems have to be stronger too. And that's the reason to use CAPTCHA on your website to verify that users are not robots.
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