Question

On my website I did not wan’t to use those distorted text CAPTCHAS. So I decided to go for a hidden field captcha.

e.g.

<form>

<input type="text" name="surprise" value="" style="display: none; visibility: hidden;"/>

</form>

Real user will not see this field, therefore they will leave it blank, where as spam bots will fill it in. I can then check if “surprise” field is empty or not and if it is empty continue stuff.

But I’m now asking this method, I don’t think it is very secure. So can you suggest? is it safe? are there any other methods of CAPTCHA that don’t require user to enter text from image?

Answer 1

What you have here will probably help to deter spam but it is far from a complete solution. A proper CAPTCHA will get you a lot further, but depending on your needs and usage scenarios, your solution might be adequate.