PayPal Inc. announced the introduction Monday of PayPal SMS Security Key, which transmits a passcode to customers' mobile phones using the short message service for text when they log on to the payment service's Web site.

PayPal, the online, person-to-person, payment processing unit of the online auctioneer eBay Inc. in San Jose said the service delivers a unique six-digit security code via text message to customers' mobile phones when they request it to log in to their accounts.

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