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Secrets In Shared Preferences

How Secrets In Shared Preferences works

Storing tokens, passwords, or keys in Android SharedPreferences or iOS UserDefaults without encryption allows easy extraction on rooted/jailbroken devices, backups, or via debug tools.

Secrets In Shared Preferences in practice

Android SharedPreferences

adb shell run-as com.example.app cat /data/data/com.example.app/shared_prefs/auth.xml

If tokens/PII are present in cleartext, storage is insecure.

How to fix and prevent Secrets In Shared Preferences

  1. Use secure storage
    • Store secrets in Keystore/Keychain; encrypt any cached values with hardware‑backed keys.
  2. Minimise and rotate
    • Avoid long‑term token storage; rotate refresh tokens and wipe on logout.
  3. Backup controls
    • Exclude preference files from backups where secrets might exist.

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