# iOS Insecure Keychain Usage

> Detects iOS Keychain items stored with insecure accessibility attributes that allow access when device is locked or without user authentication.

- Skill: `zakirkun/ios-insecure-keychain-usage` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add zakirkun/ios-insecure-keychain-usage`
- Raw SKILL.md: https://api.skillmd.com/api/skills/zakirkun/ios-insecure-keychain-usage/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: zakirkun (https://skillmd.com/u/zakirkun)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/zakirkun/ios-insecure-keychain-usage

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# iOS Insecure Keychain Usage

## Overview
iOS Keychain stores sensitive data with different accessibility levels:
- `kSecAttrAccessibleAlways` — accessible even when device is locked (insecure)
- `kSecAttrAccessibleWhenUnlocked` — accessible only when device is unlocked (preferred)
- `kSecAttrAccessibleAfterFirstUnlock` — accessible after first unlock (less secure)

Using `kSecAttrAccessibleAlways` means data can be read by malware or when device is physically stolen while locked.

## Remediation
- Use `kSecAttrAccessibleWhenUnlockedThisDeviceOnly` for most sensitive items
- Use `kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly` for highest security
- Never use `kSecAttrAccessibleAlways`