Question

I am developing a registration form in that i want to place the CAPTCHA . i generate a random string but how to convert that into the image other wise how can i develop the CAPTCHA code or any reference. thank you

Answer 1

Try out reCaptcha or check out eh blog post "Captcha Using Asp.Net" which I wrote sometime back.

Answer 2

While having a captcha may feel like a good feature, it really isn t: Nowadays there s huge swarms of labor houses in China and such where people are paid for successfully filling out captchas. Yes, that means there s thousands of people manually breaking the system all the time.

If I were implementing my own registration protection/antispam system, I d go with the more cultural one choice which is just a variation of magic words. What I mean that instead of showing barely readable garble, I d add a small intellectual puzzle and a text field for it s answer, for example asking how much is seven plus six minus one is currently a lot better at detecting both bots and stupid users.

友情链接