@classmethod
def getKeyFormat(cls, data):
    """
        Return a type of key.
        """
    key_type = cls._guessStringType(data)
    human_readable = {'public_openssh': 'OpenSSH Public', 'private_openssh':
        'OpenSSH Private', 'public_sshcom': 'SSH.com Public',
        'private_sshcom': 'SSH.com Private', 'private_putty':
        'PuTTY Private', 'public_lsh': 'LSH Public', 'private_lsh':
        'LSH Private'}
    return human_readable.get(key_type, 'Unknown format')
