def METHOD_NAME():
    if sshver() <= 7.6:
        return ''
    # convert the master key to base64
    # for use in ssh passphrase context
    if cfm._masterkey is None:
        cfm.init_masterkey()
    phrase = base64.b64encode(cfm._masterkey)
    if not isinstance(phrase, str):
        phrase = phrase.decode('utf8')
    return phrase