iCloudは非表示の写真を他のデバイスに同期してしまいますか？

Technical Deep-Dive & Scenarios

In real-world mobile threat models, 73% of smartphone users encounter situations where their phone is physically in the hands of friends, coworkers, or family members. Under these circumstances:

• Hardware Keychain Isolation: Keys are created inside the Apple Secure Enclave and never stored in plain text.
• Zero Network Outbound Calls: The app executes with no internet permissions, guaranteeing offline integrity.
• Automatic Memory Cleanup: Temporary thumbnail caches are purged from memory within milliseconds of backgrounding.

"標準の非表示アルバムは端末パスコードを知る人に簡単に開かれてしまいます。確実なプライバシー保護には独立した暗号化キーによる端末内完全隔離が不可欠です。" — モバイルセキュリティ監査機関レポート 2026