12 Example: Playfair Cipher - People
Pairskeyword219playfairkeyword12Example: PlayfairCipherProgramfileforthischapter: Thisprojectinvestigatesa cipherthatis ,thereis nota singletranslationofeachletterofthealphab et;thatis,youdon t justdecidethatevery B , howit start, ,I llpicktheword. Nowwritethelettersofthatwordinthefirstsq uaresofa fivebyfivematrix:KEYWORDThenfinishfillin guptheremainingsquaresofthematrixwiththe remaininglettersofthealphabet,inalphabet icalorder. Sincethereare26lettersandonly25squares,w eassignI andJ YD ON TY OUYI EA ES VK EZjuiceWHY A BIJWHYIYJYWYEKrowkind220Chapter12Example :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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