Using RootData

All CBFS Vault vaults contain a special data stream called RootData which can be used for application-defined purposes. A vault's RootData stream can only be accessed using the OpenRootData method, because the stream itself is not part of the vault's filesystem hierarchy. The standalone nature of the RootData stream means that:

The RootData stream is also exempt from whole-vault encryption. This exemption is intentional; it allows applications which utilize whole-vault encryption to store information about said encryption (e.g., encrypted session keys, certificates, access control lists (ACLs), etc.) within the vault itself, thus simplifying application design.

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CBFS Vault 2020 iOS Edition - Version 20.0 [Build 7986]