WE HAVE THREE TYPES OF MEMORY. The first one is organic, which is the memory made of flesh and blood and the one administrated by our brain. The second is mineral, and in this sense mankind has known two kinds of mineral memory: millennia ago, this was the memory represented by clay tablets and obelisks, pretty well known in this country, on which people carved their texts. However…..
2003/11/28
2003/11/27
2003/11/26
2003/11/25
2003/11/14
php implementation of a image-verification system by Chirag Mehta
Block Spam Bots With Free CAPTCHA Service
Posted by timothy on Wednesday November 12, @12:55PM
from the screwtape-and-pals-shriek dept.
Chirag Mehta writes “I just released a freeware service called BotBlock (barebones demo) that lets site owners copy/paste a few lines of PHP code and insert a CAPTCHA image-verification system into any web form. The amount of form spamming by bots is on a rise. While remedies exist for MT blogs, a more efficient solution is to use image-verification or text-identification. Used for a while by sites like Yahoo! (scroll to bottom), Hotmail and patented in 2001 by AltaVista, CAPTCHAs are now being used more widely. PARC also came up with two algorithms Baffletext and Pessimal Print. The technology always existed, but until now required the site owners to install image libraries and understand how to generate images that cannot be OCR’ed. With BotBlock it is like inserting a page counter.”
http://developers.slashdot.org/article.pl?sid=03/11/12/1715232