What are the types of verification codes? What s in it for each

1.Traditional type-in captchas.

It is mainly verified by the letters, numbers, Chinese characters, etc. in the user's input.

Features: simple and easy to operate, good human-computer interaction. But the safety factor is low and it is easy to crack.

2.Enterable graphical captcha.

There are beautiful patterns, and the recognition text is also clearly legible, focusing on the advertisement.

Representative: solve media, Yuchu verification code.

Features: It's not so much a captcha as an ad slot.

3.Pure behavioral CAPTCHA.

Slide the alternate fragments in a straight line to the correct position as required.

Representative: Geetest verification code.

Features: Simple operation, good experience. Single-dimensional, easy to be reversely simulated, and incompatible with mobile page switching.

4.Icon selection and behavior aids.

Give a ** piece, click on one or more of them as required. Borrow the difficulty of recognizing everything to block the machine.

Representatives: Tap verification code, Google new verification code, 12306 verification code.

5.Point-and-click verification and behavioral assistance.

Remind the user to click on the position of the same word in the picture to verify by text.

Representative: **New type of verification code, touch verification code.

6.Smart Captcha.

Through behavioral characteristics, device fingerprints, data risk control and other technologies, normal users are exempt from verification, and abnormal users are forced to verify.

Representative: Tap Smart Captcha.

Features: Simple and convenient, distinguish between man and machine, man and man, equipment and equipment.

Numbers, letters, and mixtures prevent a sentence book machine.

My verification code is an SMS verification code.

The verification code is a string of randomly generated numbers or symbols, and a ** is generally used to prevent batch registration. SMS verification code is an effective verification code system by sending verification codes to mobile phones. Whether it is large**especially shopping**, it provides a mobile phone SMS verification code function, which can ensure the safety of shopping more accurately and safely, and verify the correctness of users.

**There is a string of numbers in the text message sent to your mobile phone, that is, the verification code, which is generally used to register or bind the mobile phone. Some verification code access providers provide SMS verification code service, each ** sends a request to the access provider's server through the interface, and the server sends random numbers or letters to the mobile phone, and the access provider's server uniformly verifies the verification code.

The common verification code is a four-digit number, a random one-digit string, the most original verification code, the verification effect is almost zero, the user login is in GIF format, the current commonly used random number ** verification code, the characters on the ** are more decent, and the verification effect is better.

A CAPTCHA is a set of strings of letters, numbers, or symbols that are used to identify and confirm a user. It is often used in the verification process of registration, login, password recovery, etc., to prevent malicious attacks, brute force attacks, and other behaviors.

Refers to a person's captcha.

Verification codes for account registration, login, password retrieval, etc., are used to verify user identity and prevent malicious attacks. 2.The verification code of banks, payment and other financial institutions is used to ensure the safety of users' funds.

3.**Verification codes for institutions, medical institutions, etc., used to protect personal privacy and information security. 4.

Verification codes on e-commerce, social networking and other platforms are used to prevent malicious registration, order farming, and liking behavior. These captchas play an important role in security, and once attacked or cracked, it will bring serious losses and risks to users. Therefore, for the design and implementation of these captchas, more stringent security standards and technical means are required.

Dear, after my search results, the following categories of verification codes are considered important verification codes:1Verification codes for account registration, login, password retrieval, etc., are used to verify user identity and prevent malicious attacks.

2.The verification code of banks, payment and other financial institutions is used to ensure the safety of users' funds. 3.

**Verification codes for institutions, medical institutions and other fields to protect personal privacy and information security. 4.Verification codes on e-commerce, social networking and other platforms are used to prevent malicious registration, order farming, and liking behavior.

These captchas play an important role in security, and once attacked or cracked, it will bring serious losses and risks to users. Therefore, for the design and implementation of these captchas, more stringent security standards and technical means are required.

Dear, users also need to pay attention to protecting the security of their accounts and personal information, and do not easily disclose sensitive information such as verification codes and passwords to avoid being maliciously attacked and scammed. When using the scramble captcha, you should pay attention to choosing a credible platform and service provider that is cautious and lacking, and avoid using unknown captchas, so as not to cause unnecessary risks and losses. <>

Hello dear, I am happy to answer for you: Important CAPTCHA refers to the CAPTCHA that is important and urgent in terms of security, reliability, and impact. Dear, the following types of verification codes are important verification codes:

1.Card and payment password verification. This kind of captcha involves the security of the user's funds and privacy information, and once leaked or stolen, it may bring serious economic losses to the user.

2.Authentication. For example, the disclosure of SMS verification codes for mobile phone registration, email verification, social binding, etc., can lead to theft or impersonation of users.

The disclosure of such verification codes may lead to the theft of users' funds or the tampering of transaction information. 4.Important meeting or event validation.

For example, when conducting a splitting study, web conference, or online event, you will need to enter a verification code to confirm the user's identity and eligibility to participate. The disclosure of such verification codes may cause illegal users to enter the meeting or event, affecting the security and order of the meeting or event. Dear, it should be noted that the above are only some common and important types of captchas, and the types of captchas may vary in different industries and scenarios.

4-digit verification code, this verification method is usually a random string of numbers, 4-digit verification version.

The verification code is the most primitive verification code, the principle of right verification is relatively simple, the verification effect is not very large, and the security prevention effect of network hackers is not very strong, so it is rare in the first application.

GIF format captcha, currently commonly used random digit** captcha. **The characters on the ** are mainly composed of words and numbers, the font does not change much, and the verification effect is a little better than the 4-digit captcha. CSDN** users log in with a gif verification code.

PNG format captcha,This verification method of the captcha** is composed of random numbers and random uppercase English letters,The whole composition is a bit flamboyant,Every time you refresh it,Each character will change its position。 Sometimes the refreshed ** is difficult for the human eye to recognize. It is more secure to use the png format captcha than to use the gif format, and the qq** user login uses the png format captcha.

BMP format verification code, this verification method of verification code is composed of random numbers, random capital letters and random interfering pixels, BMP format verification code can change different random positions, and sometimes can also change random fonts.

A verification code in jpg format, which consists of random English letters, random colors, random positions, and random lengths. Google's Gmail registration uses a JPG verification code.

The answer is simple: prevent: 1 malicious cracking of passwords, 2 swiping votes, 3 forum flooding 4 anti-theft is unpreventable ..