We're evaluating Apple-hosted Background Assets for an app distributed on App Store and would like to understand the security model behind it before adopting it.
So far the public documentation only mentions the HTTPS requirement for asset transport. We'd appreciate any additional documentation or guidance covering:
- How asset downloads are authenticated (e.g., is access tied to the app's entitlement/provisioning, or is there a separate token/credential mechanism?)
- How access to specific assets is controlled/scoped
- Where Apple-hosted assets are physically/logically hosted (e.g., is this CDN-backed, and is there any control or visibility over hosting region?)
- Any other security considerations typically associated with cloud-hosted content (encryption in transit and at rest, integrity verification, etc.)
Is there a more detailed security/architecture document beyond the public developer documentation, or can someone from the team point us in the right direction?
Hi, @Artemisia! Here are answers to your questions:
- Asset packs are encrypted on App Store servers. When downloading an Apple-hosted asset pack, a person’s device cryptographically attests its legitimacy to the server. If the server can validate that attestation, then it provides the decryption key to the device.
- Only legitimate Apple devices can download and decrypt Apple-hosted asset packs.
- Apple hosts asset packs on global CDN infrastructure. There’s no direct regional control.
- Apple-hosted asset packs are encrypted both at rest on the CDN and in transit between the CDN and people’s devices. The encryption’s nature is such that decryption would fail if someone or something tampered with the transferred payload between the CDN and a person’s device.
