Password sign-in best practices

Password-based sign-in remains widely used because it is familiar, but it creates security and usability risks including forgotten passwords, credential theft, and password reuse. Firebase Authentication and Google Cloud Identity Platform recommend securing password authentication by restricting API keys, supporting password managers and One Tap sign-in, enforcing password policies, enabling email enumeration protection and App Check, and requiring multi-factor authentication for sensitive data such as financial or medical information. When MFA is not used, social sign-in and email-link authentication are presented as stronger, lower-friction alternatives, with email links recommended as a migration path away from passwords. Phone authentication can serve users without email access but carries risks related to transferable phone numbers and shared devices.

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