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Phishers are seeking to circumvent two-factor authentication schemes using man-in-the-middle attacks. Last October, US federal regulators urged banks to adopt two-factor authentication as a means to combat the growing problem of online account fraud.

Two-factor authentication involves the use of a password-generating device along with conventional passwords. That means a thief must know more than just a password to gain access to a user's account. Although the technology helps guard against fraud, a recent attack against Citibank shows the technique is far from foolproof.

The fraudulent site is automated so it uses this information to log onto the real Citibusiness login site, allowing fraudsters access to compromised accounts. The site, based in Russia, operated last week but has since been shut down, the Washington Post reports.

The attack confirms concerns from security expert Bruce Schneier that two-factor authentication schemes have been oversold as a silver-bullet solution to online identity fraud.

Banks in the Netherlands and Scandinavia have used two-factor authentication for years, and the technology is widely credited with helping to make account fraud more difficult. But the Citibank attack shows the growing sophistication of fraudsters, and undermines any notion that this approach delivers complete protection. ®

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