axiom-file-protection-ref

Explain iOS Data Protection file encryption levels and their background access implications.

Updated Dec 3, 2025

Search Tags:#encryption #ios #data security #ios development #file protection #developer reference

Ready to run

npx skills add https://github.com/tuliopc23/flying-dutchman-app --skill axiom-file-protection-ref

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: axiom-file-protection-ref
Source: https://github.com/tuliopc23/flying-dutchman-app/tree/main/.claude/skills/axiom-file-protection-ref
Command: npx skills add https://github.com/tuliopc23/flying-dutchman-app --skill axiom-file-protection-ref

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill provides comprehensive guidance on iOS file protection, helping developers choose the right encryption levels to secure sensitive data at rest and manage background access requirements.

Core Features & Use Cases

Understand Protection Levels: Detailed explanations of .complete, .completeUnlessOpen, .completeUntilFirstUserAuthentication, and .none.
Implementation Guidance: Code examples for setting and checking file protection.
Use Case: Securely store user health data by implementing .complete file protection, ensuring it's inaccessible when the device is locked.

Quick Start

Explain the difference between '.complete' and '.completeUntilFirstUserAuthentication' file protection levels in iOS.

Frequently Asked Questions about axiom-file-protection-ref

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

What is the difference between .complete and .completeUntilFirstUserAuthentication iOS file protection levels?▼

iOS file protection levels differ by device lock behavior: .complete encrypts data immediately when the device locks, while .completeUntilFirstFirstUserAuthentication keeps data accessible after the first unlock. Use .complete for sensitive data requiring strict background security.

How do I implement file protection for sensitive data in iOS?▼

Implement iOS file protection by assigning protection level attributes during file creation using Data Protection APIs. Code examples demonstrate setting levels like .complete for sensitive user health data, ensuring files become inaccessible and encrypted when the device is locked.

When should I use iOS file protection versus Keychain for storing data?▼

Use iOS file protection for managing downloaded files and application data at rest, whereas Keychain is suited for small sensitive items. The reference covers file protection levels, iCloud synchronization, and background access implications to guide this decision.

Does .completeUnlessOpen file protection allow background uploads on iOS?▼

Yes, .completeUnlessOpen allows background access for actively open files. This iOS file protection level keeps a file accessible for ongoing operations like downloads or uploads after the device locks, but secures it once closed.

Why does my iOS app lose file access when the device is locked?▼

Your iOS app loses file access when locked because files use the .complete protection level, which encrypts data upon device lock. Switch to .completeUntilFirstUserAuthentication if your app requires background access after the initial unlock.