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12 Example: Playfair Cipher - People

Pairskeyword219playfairkeyword12 Example: PlayfairCipherProgramfileforthis chapter:Thisprojectinvestigatesa cipherthatis ,thereis nota singletranslationofeachletterofthealphab et;thatis,youdon t justdecidethatevery B , howit start, ,I llpicktheword. Nowwritethelettersofthatwordinthefirstsq uaresofa fivebyfivematrix:KEYWORDT henfinishfillinguptheremainingsquaresoft hematrixwiththeremaininglettersofthealph abet,inalphabeticalorder. Sincethereare26lettersandonly25squares,w eassignI andJ YD ON TY OUYI EA ES VK EZjuiceWHY A BIJWHYIYJYWYEK rowkind220 Chapter12 Example: PlayfairCipherKEYWORDABCFGHI JLMNPQSTUVXZ(Actually, whenchoosingthekeyword,besidesmakingsure thatnoletterappearstwiceyoumustmakesuret hatI andJ donotbothappear.)

this spacing and punctuation. As an illustration of some of the special cases that complicate this scheme, consider ... an array with five members, each of which is an array of five letters.* So if the keyword is then the program will, in effect, do this: ... (The actual procedure listed at the end of this section includes a slight ...

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  Members, Actual, Spacing, Ciphers, Fairplay, Playfair cipher

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