Is it essential to use the captcha in the form?

Question

Is it essential to use the captcha in the form?

Asked 8 years, 6 months ago

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I’m completing a registration form, and I’ve taken some precautions against SQL Injection. And for the sake of aesthetics, I wouldn’t want to insert a captcha.

The form in question is for registration of users, who will login later.

My concern is that I had an experience, which I believe falls under the term "Flood", where I kept receiving several registrations of the same type, and as there was no data processing, the robot sent some links...

I take some risk for not inserting it, it is essential ?

Using captcha avoids: Flood, spam.

– Laerte

2016/06/13 at 17:42
@Laerte has how to avoid this without captcha? For an aesthetic question..

– MagicHat

2016/06/13 at 17:43
Depends on the form. If it is something "dropped" by the web, captcha does not avoid a second-rate companies from sending propaganda, because they are humans who operate the system. On the other hand, if it is a login-protected form, it rarely needs.

– Bacco

2016/06/13 at 17:50

1 answer

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by luizluan • 80 points · Answer 1 · 2016-06-13T17:44:11+00:00

Well it is a choice of yours, you can suffer an attack, several bots making several requests at the same time, believe it happens until a small server I have gone through it.

You can do the following: Limit the number of times a given ip can use the form. If a certain user uses the form 5 times in a row you show a captcha to him, it only shows if he filled and made the request several times.