Export :

Click on your profile picture at the top left of the screen (to open your settings)
Click on "Advanced"
Click on "Security"
Click on "Export encryption keys"
Set a password for the file. Like the Citadel password it must contain at least: 1 uppercase, 1 lowercase, 1 number and a special character
Add a Hint
The keys are automatically saved in your photo gallery

Import :

Click on your profile picture at the top left of the screen (to open your settings)
Click on "Advanced"
Click on "Security"
Click on "Import encryption keys"
Select the photo corresponding to the encryption keys
Enter the previously defined password
The keys are imported!

Export/Import encryption keys