+ return column_transposition_worker(message, keyword, False)
+
+def column_transposition_worker(message, keyword, encipher=True):
+ """
+ >>> column_transposition_worker('hellothere', 'clever')
+ 'hleolteher'
+ >>> column_transposition_worker('hellothere', 'clever', True)
+ 'hleolteher'
+ >>> column_transposition_worker('hleolteher', 'clever', False)
+ 'hellothere'
+ """