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The security of transactions in mobile commerce is moving away from being just an IT concern to being a business concern because of the potential loss of revenue to businesses due to lack of privacy, integrity or confidentiality, system slowdown or downtime. While most security procedures are limited to corporate IT infrastructure, in mobile commerce, issues concerned with transaction security appear to have extended beyond the corporate network to embrace the complete business process. Any lapse in procedures that maintain the confidentiality of data or the violation of privacy could affect corporate image and hence would impact on customer relationships. In turn, any adverse effect on customer relationships would impact negatively on business revenue. In addition to existing security problems in a wired commerce environment, the emergence of mobile devices has renewed calls for addressing security threats to financial transactions. These problems are discussed in this paper as key issues in terms of an organization’s architectural and procedural approaches to the security, reliability and availability of business transactions.