The document discusses best practices for implementing two-factor authentication (2FA) using Authy. It covers why 2FA is important for security, different 2FA methods like SMS, push notifications, and time-based one-time passwords. The document also discusses potential issues with SMS 2FA, alternatives to SMS, onboarding users for 2FA, user experience with 2FA, and practical cryptography techniques used in 2FA apps like Authy. Several Twilio engineers provide insights into building phone verification at scale and preventing social engineering attacks using Twilio Flex.
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