ios-security
Secure iOS apps with Keychain, biometrics, and data protection. Use when implementing Keychain storage, Face ID/Touch ID, or data protection in iOS.
What this skill does
# iOS Security ## **Priority: P0 (CRITICAL)** ## Implementation Workflow 1. **Store secrets in Keychain** — Use `SecItemAdd`, `SecItemUpdate`, and `SecItemDelete` with `kSecClassGenericPassword` for tokens/PII. Never use `UserDefaults`. 2. **Add biometric auth** — Use `LocalAuthentication` with `LAContext`. Verify availability with `canEvaluatePolicy` before prompting. 3. **Encrypt files** — Use `Data.WritingOptions.completeFileProtection` when saving to disk. 4. **Keep ATS enabled** — Never disable App Transport Security globally in `Info.plist`. 5. **Pin certificates** — Use `ServerTrustManager` or `TrustKit` for production apps to prevent MITM attacks. 6. **Strip sensitive logs** — Ensure PII and tokens removed from logs in Release builds. See [Keychain and biometrics implementation examples](references/implementation.md) ## Anti-Patterns - **No Secrets in `UserDefaults`**: Always use Keychain for tokens and PII - **No Unhandled `LAError`**: Check for `userCancel` and `authenticationFailed` in biometric flows - **No PII/Token Logging**: Strip sensitive data from all logs in Release builds ## References - [Keychain & Biometrics Implementation](references/implementation.md) ## Related Topics - common/security-standards - architecture
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