More Spam Originating from Gmail
The email security vendor MessageLabs (”Completely Automated Public Turing test to tell Computers and Humans Apart”) and they are difficult to solve automatically. Last month, discovered that spammers managed to create bots that automatically sign up for new Gmail accounts with a success rate of 20%.
We discovered that the CAPTCHA breaking process for Gmail is sophisticated when compared to the which was reported in our recent blogs. It is observed that two separate hosts active on same domain are contacted during the entire process. These two hosts work collaboratively during the CAPTCHA break process. Unlike Live Mail CAPTCHA breaking, which involved just one botted host doing the entire job (signing up, filling in details, getting the CAPTCHA request), the Gmail signing process involves two botted hosts (or CAPTCHA breaking hosts).
that “there’s simply too much money to be made in email spam for the commercial CAPTCHA algorithms, regardless of how good they may be, to survive forever.” He suggests to diversify the tests and use more difficult tasks like distinguishing dogs from cats or solving failed OCR inputs, but making the test more complicated will frustrate users.
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