Other Security Mitigations and Tips
Out of band considerations
An 'out of band' solution may be an option for high-risk transactions or as an alternative to a purely technical solution. 'Out of band' usually involves some communication or transmission between the client and the service provider that is not reliant solely on the Internet for transmission. Examples of 'out of band' include cellphones, SMS messaging, telephone call or service mails. An 'out of band' solution involves a higher level of complexity and infrastructure that would have to be balanced against cost and benefits being obtained.
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