Wednesday, July 30, 2008

Captcha To Protect From Automated Register Bots

Captcha To Protect From Automated Register Bots

A CAPTCHA is a type of challenge-response test used in computing to ensure that the response is not generated by a computer. The process involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade. Because other computers are unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human. A common type of CAPTCHA requires that the user type the letters or digits of a distorted image that appears on the screen.

More about Captha
http://en.wikipedia.org/wiki/Captcha

This websites can be used to genarate captcha.

reCAPTCHA

http://recaptcha.net/

reCAPTCHA is a free CAPTCHA service that helps to digitize books.

A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from "bots," or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs.

White Hat Web Design PHP Captcha Security Images

http://www.white-hat-web-design.co.uk/articles/php-captcha.php

This script generates images (known as "Captcha's") which contain security codes used for protecting a form from spam bots. By encoding a 'password' inside an image and asking the user to re-enter what they see you can verify the user is a human and not automated software submitting your form.


Monday, July 14, 2008

Platform for Privacy Preferences Project P3P

Platform for Privacy Preferences Project P3P

The Platform for Privacy Preferences Project (P3P) enables Websites to express their privacy practices in a standard format that can be retrieved automatically and interpreted easily by user agents. P3P user agents will allow users to be informed of site practices (in both machine- and human-readable formats) and to automate decision-making based on these practices when appropriate. Thus users need not read the privacy policies at every site they visit.

More information
http://www.w3.org/P3P/