CAPTCHA? What’s that?
Have you ever seen a box asking you to prove you’re human? That’s called CAPTCHA! It stands for Completely [[Automated::Something done automatically.]] Public [[Turing test::A test to check a computer's ability to imitate human behaviour.]] to tell Computers and Humans Apart. It’s a test to ensure whether an online user is a human, not a [[bot::A computer program that runs automatically and does specific tasks. Bots can create fake accounts, write comments, and can also be used to steal data or hack into websites.]].
You often find CAPTCHA and its cool cousin, reCAPTCHA, when you're online. reCAPTCHA is a better version of traditional CAPTCHAs. These tests help keep websites safe by ensuring only humans can access them.
How do CAPTCHA and reCAPTCHA work?
Have you ever tried to log into a website and had to solve a puzzle first? Maybe you had to figure out some funny-looking letters and type them in. That’s a regular CAPTCHA test! It’s there to ensure you’re a human, not a bot, as bots can’t read those tricky letters.
But wait, there’s more! There’s another test called reCAPTCHA. Sometimes, it shows you pictures of real things like street signs or books. Or you might see many photos and have to pick the ones with trees, animals, or cars.
If you pick the same pictures as most other people, you pass the test! While this task is difficult for bots and [[artificial intelligence::Technology that allows computers to think and solve problems like humans.]] (AI), it isn’t for humans.
AI is beating CAPTCHA tests.
Solving CAPTCHA and reCAPTCHA tests is difficult for AIs and bots. But a super-smart [[AI model::An AI software or technology]] named YOLO (which stands for "You Only Look Once") can now crack these tests easily!
Researchers in Switzerland trained YOLO by showing it thousands of pictures and teaching it how to recognise all kinds of objects. After lots of practice, YOLO learned to solve the [[reCAPTCHAv2::A better version of reCAPTCHA, which is mostly used these days.]] tests!
What’s next?
The fact that an AI can now clear CAPTCHAs shows AI models' growth. But it also means we must create even harder puzzles to keep them out.
If bots and AI can figure out these tests, they could sneak into websites and cause trouble. That’s why companies like Google are working hard to make new puzzles that only humans can solve. As robots get smarter, we must be even smarter to keep our online spaces safe!
Quick Revision
• CAPTCHA is a website test that checks if a user is human, not a bot. reCAPTCHA is a better and safer version.
• It may ask users to type tricky letters or choose pictures like cars or trees, which humans can solve easily.
• A smart AI called YOLO has learned to solve reCAPTCHAv2 tests after being trained with many images.
• Since AI can now pass these tests, companies must create stronger puzzles to keep websites safe.
