CAPTCHA
Disguised image which people can read but computers cannot
Related news articles
Cracked CAPTCHAs used to create malicious blogs
Blogs on Google's blogging system redirect to spam sites.
25 April 2008
Gmail CAPTCHA cracked
Twenty per cent success rate sufficient to create thousands of spam accounts.
26 February 2008
Live Mail CAPTCHA system bypassed
Spammers use botnet to register accounts on popular free webmail service.
11 February 2008
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