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ios-security

Secure iOS apps with secure storage, biometrics, and data protection. Use when implementing secure storage, Face ID/Touch ID, or data protection in iOS.

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  • SKILL.md2.0 KB
  • evals/evals.json1.8 KB
  • references/implementation.md2.2 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

iOS Security

Priority: P0 (CRITICAL)

Implementation Workflow

  1. Store secrets in secure storage — 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 the iOS Info configuration.
  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 Secure storage and biometrics implementation examples

Anti-Patterns

  • No Secrets in UserDefaults: Always use secure storage 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

Related Topics

  • common/security-standards
  • architecture

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • iOS app configuration
  • LocalAuthentication

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