Raised by Ussd.Record.set_encrypted/4 and get_encrypted/4 when no encryption key
is configured. Set config :ussd, :encryption_key, "..." (any length; it is hashed
down to an AES-256 key).
Raised by Ussd.Record.set_encrypted/4 and get_encrypted/4 when no encryption key
is configured. Set config :ussd, :encryption_key, "..." (any length; it is hashed
down to an AES-256 key).