flutter-security
Enforce architect-level security standards including AES-256-GCM encryption, secure storage, biometric gates, and memory safety. Use when handling sensitive data, credentials, clipboard content, or API communication security.
What this skill does
# Security & Data Integrity (Architect Level) - **AES-256-GCM**: Use Authenticated Encryption for all sensitive storage. - **Secret Storage**: Mandatory use of `flutter_secure_storage` for encryption keys and master-derived keys. - **Key Derivation**: Mandate NIST-approved hashing (**Argon2id**) for master password derivation before local storage encryption and export. - **Memory Safety**: Strictly clear sensitive variables (passwords, keys) from memory when the operation finishes or the app enters the background. - **Clipboard Safety**: Mandate programmatic clearing of sensitive data (OTPs, Passwords) after a short duration (30-60s). - **Biometric Gate**: Mandatory local authentication for any view, export, or destructive action. - **Audit Log**: All security-sensitive actions should be logged via `AppLogger` (excluding raw secrets). # Input & API Security - **Input Validation**: Validate and sanitize all user-facing input fields before processing or storage. - **HTTPS Only**: All API communication MUST use HTTPS. Consider certificate pinning for sensitive applications. - **Token Storage**: STRICTLY prohibit storing tokens, API keys, or credentials in source code or public repositories. Use `flutter_secure_storage` or environment-based injection.
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