Sharing a Keychain Between Apps
A Keychain can be shared across multiple iOS apps if they are published by the same developer and under certain conditions. The most important requirement for sharing Keychain data between two apps is that both apps must have the same bundle seed. For example, consider two apps with the bundle identifiers 659823F3DC53.com.ICF.firstapp and 659823F3DC53.com.ICF.secondapp. These apps would be able to access and modify each other’s Keychain data. Keychain sharing with a wildcard ID does not seem to work, although the official documentation remains quiet on this situation. Bundle seeds can be configured from the developer portal when new apps are created.
When you have two apps that share the same bundle seed, each ...
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