Zashi data stored in the keychain

[LukasKorba]

When a user generates some data in the settings, like flags for opt-in/out or any possible value (like currency, etc.), it would be great to store it as encrypted data.

We have 2 options:

• custom encryption of data and store it in UserDefaults
• use keychain

In case of Keychain, the issue is such data won't be deleted when the app is deleted.

Solution could be to create a dummy flag and address scenarios:

• app started, there is no dummy flag but also no keychain data = fresh app start
• app started, there is no dummy flag but keychain data are present = Zashi was deleted and reinstalled, clear the custom data from Keychain
• app started, there is dummy flag = regular start