iOS Keychain Migration Guide

Keychain Access Changes

Keychain sharing continues to work only until the app is updated. After an update, the keychain needs to be rebuilt with the new Team ID.

Operation Token Rescue Technique

Step 1: Preparation Phase

Submit update to old developer account

Move tokens to non-keychain storage

Verify data accessibility

Step 2: Transfer Phase

Transfer app to new developer account

Update bundle ID and entitlements

Deploy initial version

Step 3: Restoration Phase

Move data back to keychain

Validate access patterns

Clean up temporary storage

Re-authentication Strategy

User Experience

After users update their app, they will need a one-time re-login as the app will not find the authentication token in the keychain. Here's how to handle this gracefully:

Display clear re-authentication messaging
Preserve user preferences and settings
Implement automatic token migration where possible

Technical Implementation

The keychain group must be replaced with one created by the recipient that includes their Team ID. Key steps:

Update keychain access groups with new Team ID
Modify entitlements for new keychain group
Update provisioning profiles

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