INDIVIDUAL PROBLEMS: PLAYFAIR CIPHER DUE 1/19/01

6. Using the keyword "Gustavus," form the keyword-mixed alphabet, omitting letter "j," and put it in a 5-by-5 Playfair key-square.

a. Encipher this message: "This message calls for nulls."

b. Decipher this message: "GZBZB LGEHO VMBWZ DSY."

7. Using the keyword "Adolphus," form the keyword-mixed alphabet, omitting letter "j," and put it in a 5-by-5 Playfair key-square.

a. Encipher this message: "This message calls for nulls."

b. Decipher this message: "LMFVM EHAFR IGFWV IQZ."