Approach:
Find the first unstripped secret key and use it for passphrase verification
All unstripped keys will have their passphrase changed to new passphrase, if possible.
Current Progress:
Changing the passphrase of keys works fine.
Refactoring to combine "modifySecretKeyring" and newly added method, "modifyKeyRingPassword"
may be possible if given the go-ahead.
For issue #1779, a provisional fix where selection is still possible, but more difficult.
Preventing selection altogether is not possible due to the implementation in the Masked-Edittext dependency.
To be updated when Masked-Edittext fixes this bug.
Alex Fong