OS X Login Keychain
The OS X keychain is a system-wide service that can be used by applications to protect their data.
1Password uses the login keychain to store some of its data:
- Channel code: Used to encrypt communication between 1Password and your web browsers.
- SSL certificates: Required to encrypt Wi-Fi traffic when syncing with an iPhone.
- Sync authentication: Used to identify authorized iPhone clients.
- Access Codes: Only stored if specified, this is the access code you provided when exporting data to an iPhone Safari Bookmark or syncing to a Palm device.
- Master Password: Only stored if you enable the option, this is your 1Password Master Password.
This information is stored in the login keychain instead of the 1Password database because 1Password needs to access it even when its own database is locked.