Network,What is the verification code entered when logging in?

To put it bluntly, there is no such thing at all, and you have to type the verification code, wasting time and energy.

In the era when there was no captcha, any small brute-force cracking tool could try to crack the username and password without limits; With a captcha, you can effectively curb brute-force tools, but of course, this is only relative, because it is now said that there are cracking software that can recognize the captcha!

The function of the verification code: to effectively prevent this problem on a specific registered user with a specific program brute-force cracking method to make continuous login attempts, in fact, the use of verification code is now a lot of popular methods (such as China Merchants Bank's online personal banking, Tencent's QQ community), we use a relatively simple way to achieve this function. Although it is a little more troublesome to log in, this feature is still necessary and important for the community.

However, we still remind everyone to protect their passwords, try to use more than 6 digits of passwords that are mixed with numbers, letters, and symbols, and do not use simple passwords such as 1234 or passwords that are the same or similar to your username. Don't set a password at will just because you just come to iclub to ask questions, and protecting your own password is also protecting yourself, so as not to cause unnecessary trouble to yourself if you are stolen by others.

Prevent malicious software logins.

Prevent illegal operations by people other than the person.

Prevent others from using it to keep you safe.

Prevent number theft software, or remote login.

Prevent malicious unlimited registration and number theft.

Prevent malicious logins or leak your secrets by logging in to your number at will.

Prevent malicious registration and account theft.

Prevent others from stealing numbers.

The actual purpose of the captcha is to verify the user's identity to avoid theft. The security that can be improved is mainly to protect the safety of users. Captcha is generally used to prevent someone from taking advantage of botsAutomatic bulk registrationContinuously log in and flood specific registered users by brute-force cracking methods of specific programs.

Because the captcha is a mixture of numbers or symbols, it looks like a struggle to the human eyeIt is even more difficult for machines to recognize。Like Tieba, if you don't log in to post, you have to enter a verification code, probably to prevent the occurrence of large-scale anonymous replies.

Because your web site sometimes encounters malicious attacks from the client, one of the most common attack methods is identity spoofing which is written in the client-side script, and then exploited by it, the client logs in repeatedly in the forum, or the attacker creates an html form if it contains the same fields such as your registration form or posting form, and then exploits"http-post"If the server itself cannot effectively verify and reject this illegal operation, it will seriously consume its system resources, reduce the performance and even crash the program. <>

And now the popular way to determine whether a web program accessing a web program is a legitimate user or a malicious operation is to use a method called"Character checking"technology。Web**Like the current dynamic network forum, he uses the method to provide customers with a ** that contains the following strings, which the user must read, and then submit them with the login form or the post form and other user-created forms. <>

Because of a human, it is easy to read the numbers in **, but if it is a client-side attack**, it is difficult to identify the captcha by general means, so as to ensure that the current access is from a person and not a machine. Captcha: It is to generate a string of randomly generated numbers or symbols, add some interfering pixels (to prevent OCR), and the user will recognize the verification code information by the naked eye, enter the form to submit**Verification, and a certain function can only be used after successful verification.

In fact, it is only used to verify the user's identity, which is also a practical function!

In this way, we can determine whether it is the person we are, so that we can protect the security of our account

The captcha is actually used to verify the user's identity and has a protective effect.

These codes are actually used to verify that you are not using them.

This verification code can verify the identity and can effectively improve our security.

In fact, the verification code has no effect, and the biggest role is to verify whether it is the person.

This should be a way to keep your account safe, and it's normal.

I think the security that CAPTCHA can improve is mainly to protect the safety of users.

I think this is mainly to verify that it is me, so that we can better confirm the responsibility.