11. Encrypt the message AT TWO MARCH TOWARDS BASE CAMP using a tabular transposition cipher with rows of length 4 characters. If necessary, pad the message with A's.

13. Encrypt the message AT MIDNIGHT SURVEILLANCE ON TRENCHES using a tabular transposition cipher with encryption keyword ABOUT. If necessary, pad the message with A's.

14. De-crypt the message AHUR NTET OEFA HNSI DTTH VSOL ZEPF IC if it was encrypted using a tabular transposition cipher with rows of length 6 characters.

15. De-Crypt the message EVA NCF TRL OEV ASI CAM TUL ESP NEN BAH if It was encrypted using a tabular transposition cipher with encryption keyword GREAT.