Various verification Codes

Remember the previous article "Super verification code"? In fact, there are many abnormal verification codes in this world. The following is a list of strange verification codes. However, this article is not just about collecting the verification code, but the previous one is not a joke. The next one will show you what an accessibility verification code is.

　　Completely invisible

Is this a human character?

What are the letters in the logo?

This is amazing.

　　Pretty clear but crazy

　　

Mathematical formula

If you fill in the correct information, are you a human?

　　Smart question

　　Is your aesthetic level normal?

　　Do you know Braille?

　　ASCII Image

　　How to verify whether a person is an adult

　　3D Verification Code

Http://ocr-research.org.ua/tb/getimage.php5 automatically generated through this script

　　ReCAPTCHA

I believe everyone knows that reCAPTCHA has played a huge game, which helps you restore words that are hard to be recognized by OCR when you lose the verification code. There are two sets of verification codes, one can be recognized by the computer, and the other can not be recognized by the computer (that is, let people help the computer to recognize). If your first group is correct, it will be regarded as a human operation, so the second group you answered will become a human OCR.

It will add another new feature recently: displaying Street View addresses and names on Google Maps. In this way, street scenes on the map are extracted from street addresses, names, traffic signs, and other data to improve the information on Google Maps.

　　Facebook's facial recognition Verification Code

Do you think you are creative?

　　Microsoft's asirra

 

　　Distcha

Verify the image by swiping the style when the iPhone/iPad is turned on.

 

　　Motioncaptcha

Draw a painting with the mouse.

 

　　Dragcapcha of sitehelp

Sort the following letters in order.

 

　　Jquery Verification Code plug-in

　　Jquery s3capcha plugin

 

　　Ajax fancy CAPTCHA

Unlike the one above, you need to drag

 

　　Wcaptcha

Similar to the above.

 

　　Picatcha

Pick out all calculators

 

　　Yocaptcha

Ad-style Verification Code

 

　　W3C recommendations

The W3C article (http://www.w3.org/TR/turingtest/) expresses the inaccessibility of traditional verification code pictures, and some verification codes are easily cracked. For example:

• Aicaptcha: Using AI to beat CAPTCHA and post comment Spam
• Breaking CAPTCHAs without using OCR
• Pwntcha-CAPTCHA Decoder

W3C also provides some solutions:

• Some logic questions or smart questions.
• Voice output, in order to take care of the disabled. Spam-bot tests flunk the blind
• Limit the number of operations performed by the account.
• Use the existing spam detection mechanism. For example, comments from coolshell.cn do not have verification codes, and spam comments are completely filtered by the akismet plug-in.

We recommend that you go to see this article.

Various verification Codes