Google reCAPTCHA in ASP.NET MVC 3 using the Razor engine

added by tkglaser
2/20/2012 4:42:49 AM


Adding Google's reCaptcha to an MVC 3 form.


2/20/2012 11:30:51 AM
Another nice thing about reCAPTCHA is that it supports Google's book scanning/OCR initiatives.
The words you see that are garbled are actually words scanned from books that it cannot recognize. The way the captcha system works is you are given one word that it knows, then a word that it doesn't. If you give it the correct response for the word it does know, it then trusts that the word it didn't know you answered correctly. If enough people agree on what the word is, it then accepts that as the value for that word and uses it in the scanned book. There are a couple nuances to the system, as far as rejecting you if you guess the second word differently from what the general consensus is, but I don't know what those are off the top of my head.