What a secure Flutter authenticator must get right
Authenticator apps are small UIs with outsized security consequences. Whether you study Aegis or another TOTP client, the Flutter-relevant lessons are the same.
Non-negotiables
- Secrets encrypted at rest (platform keystore/keychain when available).
- Screenshot/clipboard hygiene and auto-lock.
- Backup export that is encrypted — and tested restore.
UI notes
Large OTP lists need virtualization and urgency in copy-paste feedback. Accessibility labels should include the account name, not only the code.
Pitfalls
Storing seeds in plain SharedPreferences is how “security” apps fail reviews and user trust.
Even for a learning project, practice secure defaults.