I was using attr_encrypted mechanism previously,
attr_encrypted :ssn, key: :encryption_key, algorithm: 'bf-cfb', mode: :single_iv_and_salt, insecure_mode: true
and I upgraded it to vault-rails:
include Vault::EncryptedModel
vault_attribute :ssn
I want to keep both in a way that, if some data is already saved using attr_encrypted then use that, and use vault for new user or if any old user is updating their data.