You are in a hurry to log in to a website, but, there comes the CAPTCHA with a picture of some crooked, distorted text that seems to be simply irrelevant and silly. You are asked to enter the optically baffling security code. Sometimes, they are so distorted that it seems almost impossible to decode them.
I am pretty sure, all of you out there must have come across the CAPTCHA text, haven’t you?
I encounter the CAPTCHA text or images on a daily basis because I spend some good number of hours online. CAPTCHA’s are everywhere. Whether you need to log in your email – they are there, even when you have to book the tickets – they are there, you need to pay a bill online and they are there too. I have had some pretty annoying experiences when I had to enter the text again and again, as I could not get it right. I have always wondered why these silly texts exist.
If you have ever wondered on what this CAPTCHA really does, follow my quest to know all about them.
What is CAPTCHA?
You must be thinking what exactly is a Turing test?
Alan Turing was a computer theorist who invented the Turing test which humans use to see if the machine can converse like a human being.
CAPTCHA is actually a Reverse Turing test because the test is administered by a machine to test whether you are a human or not, but the core principle remains the same.
The term ‘CAPTCHA’ was founded in 2003 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford.
Why is it used?
CAPTCHAs is used for security purposes like:
• Preventing Comment Spam in Blogs.
• Protecting Website Registration.
• Protecting Email Addresses from spammers
• Search Engine Bots.
• Worms and Spam.
How do these work ?
The website blocks automated systems, which can't read the distorted letters in the graphic and thus secure themselves.
Types of CAPTCHA used
Picking the right images like Choose the cats out of the given set of pictures, adding or subtracting numbers are also used.
Now that I understand those distorted squiggly words that I struggled with are actually there for a reason, I hope I hate them less.
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Incredible site, love the design I have a client looking for something similar. Joe from Dublin