What is the purpose of the captcha and what is the purpose of the captcha

The order brute-force hack method is carried out in a constant login attempt, in fact, with a captcha is now very.

But this feature is still necessary and important for the community. But we're still there.

It is to remind everyone to protect their passwords, and try to use a mixture of numbers, letters, and characters.

number of more than 6 digits, do not use a simple password such as 1234 or with.

Passwords with the same username and similar usernames. Don't just come to iclub and ask questions.

Intentionally set a password, protect your own password is also to protect yourself, so as not to give you.

People steal and bring unnecessary trouble to themselves. ~

1）.Captcha is generally to prevent batch registration, and it looks difficult to the human eye, let alone a machine.

Utensil. The second like the post bar is not logged in, and the verification code is entered to prevent large-scale anonymity.

At present, many ** in order to prevent users from using bots to automatically register and log in.

Recording and irrigation, all using captcha technology. The so-called captcha is to randomly produce a string.

OCR), the user will recognize the verification code information with the naked eye, and enter the form to submit ** verification.

A feature can only be used after successful verification.

2）.Generally, the place where the user ID is registered and the major forums require a verification code.

3）.Common captchas.

1. Four-digit number, a random one-digit string, the most original verification code, the verification effect is almost.

Zero. 2. CSDN** user login is in GIF format, which is currently commonly used as a random number diagram.

For those with basic graphic iconography knowledge, unbreakable! It's a pity that the program that reads it, is used in csdn.

On the first day of it, it seems to have been posted in the forum, which is really pathetic!

The whole composition is a bit flamboyant, and every time it is refreshed, each character will change its position! Yes.

When it comes out, the human eye can't recognize it, it's amazing....4. When the hotmail application of MS is made.

is in bmp format, random number + random capital English letter + random interference pixel + random position.

5, Google's gmail registration is in jpg format, random English letters + random color + with.

Machine position + random length. 6. Other major forums are in XBM format, and the content is random.

All use captcha technology. The so-called captcha is a string of randomly generated numbers or characters.

Identify the verification code information, enter the form to submit ** verification, and the verification can only be made after the verification is successful.

with a certain function.

Don't talk nonsense, just prevent malicious registration of registered software.

If you can't receive the message, you won't receive the verification code.

Some of them can also be dialed by voice.

Question: I don't have a SIM card.

Question: But how to install the mobile phone card?

Answer: The mobile phone has a built-in card slot, generally on the top and bottom of the mobile phone, there will be a small hole next to it, take a needle to poke the small hole and then the card slot will pop up, after the mobile phone card is aligned and put in, then push the card slot in, and turn on the mobile phone.

Question: Can you take a picture of me? I don't understand what you're talking about.

Prevent someone from taking advantage of the bot to do something.