Some two thirds of popular Apple iPhone applications transmit users' UDIDs, leading to potential security concerns, a new study has warned.
Eric Smith, Assistant Director of Information Security and Networking at Bucknell University in Lewisburg, Pennsylvania, discovered 68 percent of the 57 top applications in the Apple iTunes App Store sent out UDID information, back to a remote server, owned either by the application developer or an advertising partner.

Popular iPhone applications tested included those from Amazon, Chase Bank, Target, Sams Club, Best Buy, Barnes & Noble, eBay, PayPal, Bank of America, Wells Fargo, Fidelity and America Express.

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