INDIVIDUAL PROBLEMS: PLAYFAIR CIPHER SOLUTIONS

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

G U S T A

V B C D E

F H I K L

M N O P Q

R W X Y Z

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

--> th is me sx sa ge ca lx ls fo rn ul ls

--> UK OC QV CS TG AV ES IZ IA IM WM AH IA

--> UKOCQ VCSTG AVESI ZIAIM WMAHI A

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

--> ar ew eh av in gf un ye tx

--> Are we having fun yet?

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 D O L P

H U S B C

E F G I K

M N Q R T

V W X Y Z

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

--> th is me sx sa ge ca lx ls fo rn ul ls

--> MC GB VM GO HO IF HP OY OB GD TQ BD OB

--> MCGBV MGOHO IFHPO YOBGD TQBDO B

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

--> ar ew eh av in gf un ye tx

--> Are we having fun yet?