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Building a better spam-blocking CAPTCHA

Jan 24, 2009, 14:01 (0 Talkback[s])

"But while no one has yet come up with a computer that can fool people into thinking it's another person, computers are great at fooling other computers. These days, malware makers and spammers regularly trick the CAPTCHA systems at big-name Web sites such as Yahoo Mail, Gmail and Craigslist, and use these sites to automate their attacks. So what can we do? Can CAPTCHA be saved?...

"Unfortunately, beginning in early 2008, crackers started getting the better of the CAPTCHA systems. In short order, Yahoo Mail's, Gmail's and Hotmail's CAPTCHA defenses were cracked.

"Then, adding insult to injury, the crackers started releasing their work in the form of do-it-yourself CAPTCHA cracking software that anyone could use. For example, a program called CL Auto Posting Tool attempts to post bogus ads to Craigslist while automatically overcoming Craigslist's antispam protections."

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