Efficient Captchas
There is a whole lot of buzz in the internet about alternatives to captchas (i mean alternatives to image captchas). Its not mainly because captchas are not secure against bots, but because they aren't convenient!!! People are getting bugged because of highly illegible captcha strings (http://tinyurl.com/5bvk7c). But i really feel, captchas, if done properly are the best form of human recognition technique. Its simple, fast, and sufficiently secure. People are used to image captchas, and it just works! I get more bugged when I'm asked silly questions, or to solve a mathematical equation or when i have to select kittens out of 9 pictures of animals!!! I put up some points here on how to create usable and convenient captchas: 1. Use a light background. I'll prefer a plain white background. Backgrounds do provide some security but having a regular background for all captchas does not helps as an average captcha solving algo will adapt itself to it. So, its always better to pre