The use of captcha reduces the likelihood of automatic penetration of web resources. Captcha is a test that separates a human from a robot and protects a website from intruders.
It is believed that CAPTCHA appeared on the Internet after 2000. The word itself is an abbreviation for English words. In translation, it sounds something like this: "Fully automatic Turing test to say: Robots are separate, People are separate." It's funny, but conveys the destination very accurately.
Captcha is a test that offers to manually enter a set of characters; illegible word or group of words. Recognize pictures, images that need to be turned over meaningfully; puzzle, assembled into a picture. The robot will not be able to cope with this task, but the human can do it.
Thus, captcha helps to recognize automatic entry and makes it difficult to access the resource. Complex captcha has an audio version for the visually impaired. Which makes it easier to write.
Captcha annoys the user. Why do they put it?
Captcha complicates access to websites, limits the number of spam comments, automatic downloads, attempts to penetrate social accounts. networks and hacking the admin panel of sites. This is dictated by concern for the safety of the resource.
There are many programs created in order to leave links to third-party questionable resources on your site through spam comments. Hacked social media pages networks, too, will not deliver. It is the popular social networks that mainly serve as tasty prey for advertisements and malicious banners.
Imagine for a minute that spam and pictures of questionable morality will be sent to your friends and colleagues under your name and photo. Therefore, now the captcha is put by all social. networks.
If you have your own web resource, its owner should first of all take care of security. There are many cases when a viral banner suddenly appeared on the site or it was impossible for the owner to enter the site. The site ended up in the hands of scammers. Measures to rescue, treat, and sometimes even get out of the search engine ban are so complex and expensive that you should not neglect all available preventive measures.
Whether to install captcha on your website is up to you. If you notice an increase in spam comments, then you need to put a captcha. You will notice the result immediately. Their number will either decrease significantly, or such comments will disappear altogether.
How reliable is the protection of a site with captcha?
In about 20 attempts, the robot is able to recognize a captcha, where it is required to solve a simple arithmetic example such as 1 + 2 = or something like that, therefore, in addition to setting it, a limitation on the number of attempts to enter and a prohibition of the IP address is introduced.
More complex and fanciful captchas are given for recognition to people who want to make money. Such work costs 1 kopeck, and in order to earn one dollar, you have to correctly recognize and enter more than 3 thousand pictures, word combinations and complex mathematical examples. Despite the ingratitude of such work, the number of people willing does not diminish, which makes the sites vulnerable, despite the presence of captcha.
There are also more complex technologies. There is an opinion that if your site is chosen by serious spammers, sooner or later they will hack it.
Captcha is included in the complex of security measures. She is only one of the links of protection, but effective and in most cases successfully fulfills the task assigned to her: to prevent the robot from entering the site. Robots - separately, humans - separately.
Few people like to enter characters that are difficult to distinguish or require some effort in an attempt to leave a comment on the necessary resource or download the necessary material, but every Internet user should understand that captcha acts as a border barrier.
