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。

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From online check-outs to banking login screens, sites today use tools like captchas and two-step verification to confirm a consumer's identity.

如今，从在线退房到网银登陆，网站都可以用验证码和两步验证来确认用户的身份。

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This means designers of CAPTCHAs cannot simply increase the amount of distortion to foil attackers.

这意味着验证码的设计者们不能仅靠增加文字扭曲程度来打击攻击验证系统的人。

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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.

FORBES: Magazine Article

"There are some obstacles we need to overcome in duplicate detection and captchas, " he says.

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