卡内基梅隆大学(CarnegieMellonUniversity)发明了这种被称为“验证码”(Captchas)的东西,它被当作一种安全措施——把能看懂这种扭曲字体的人类,与其它电脑区分开来.
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Authentication errors and captchas 验证错误和验证环节
You can also get around CAPTCHAS by being clever.
你也可以通过耍小聪明来绕过 CAPTCHA。
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Scrapers sometimes fight back with software that deciphers captchas.
信息搜集公司有时用能破译验证码的软件予以还击。
Even so, researchers are already looking beyond text-based CAPTCHAs.
即便如此，研究人员已经把目光投向文本基础的验证码之后了。
In February, Web security firm Websense announced that CAPTCHAs at Google, Microsoft and Yahoo!
FORBES: Magazine Article
But in July, reports surfaced that the services' upgraded CAPTCHAs had also been defeated.
"There are some obstacles we need to overcome in duplicate detection and captchas, " he says.
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