def METHOD_NAME(self):
    return {
        'encryption_key': base64.standard_b64encode(self.encryption_key).decode('utf-8'),
        'sign_key': base64.standard_b64encode(self.sign_key).decode('utf-8'),
        'rsa_key': base64.standard_b64encode(self.rsa_key.exportKey()).decode('utf-8')
    }