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Secure e-Payment Portal Solutions Using Mobile Technologies and ...

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7.2 NFC M-PAYMENT SYSTEM BASED ON 3Ggenerating a fraudulent result.This proposed system is an evolution of the GSM design described in [173],rather than a completely new one. The scheme leverages from the 3G/UMTSenvironment <strong>and</strong> security mechanisms. A new version of the USIM (SE-SIMfor NFC use) provides a secure environment for data confidentiality (strongerencryptionkeylength), clientauthentication<strong>and</strong>authorisationfunctionalityaswell asmutual authentication between the terminal(POS) <strong>and</strong>the NFCphone.In addition, the attributes of NFC wireless technology offer a simple “touch”human-machine interaction that significantly enhances ease-of-use, technicalacceptability, cognitive automation <strong>and</strong> incorporates compatibility with existingRFID/contactless infrastructure. 3G networks are widely used, thusscalability is achieved, <strong>and</strong> due to re-use of the 3G functions/mechanisms theproposed scheme has good compatibility to existing infrastructure.7.2 NFC M-PAYMENT SYSTEM BASED ON 3GIn this section We describe the design of our proposed mobile payments protocol.The envisaged application scenario is a customer conducting an m-payment in a “physical” store environment with the customer’s phone beingauthenticated onto a 3G network. Our design goal is an m-payment systemthat can reuse/leverage existing 3G security mechanisms <strong>and</strong> take advantageofthe identity/authentication services provide by theMNO <strong>and</strong>USIM tobuildan NFC m-payment service.133

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