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Two-factor authentication (2FA) is the most straightforward way for companies to drastically improve the security of their user authentication process. However, not all 2FA implementations are created equal. Thinking of quickly throwing together a workflow using SMS and calling it a day? Think again! Though popular, 2FA via SMS has many security issues and was actually deprecated by NIST in 2017. In this presentation, I dive into the technical details of the most common 2FA implementations and highlight security and usability trade-offs. You will learn how to develop a 2FA implementation strategy that will best serve your users.