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Mixed Alphabets with Words And Mixed Alphabets with Columnar Transposition

Mixed Alphabets with Words And Mixed Alphabets with Columnar Transposition. Team Members : Mike, Peter, Lakhbir, Joe Fijalkowski. Mixed Alphabets with Words. Keyword is given A Keyword provide a way of mixing of the alphabet that is easy for two correspondents to remember.

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Mixed Alphabets with Words And Mixed Alphabets with Columnar Transposition

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  1. Mixed Alphabets with Words And Mixed Alphabets with Columnar Transposition Team Members: Mike, Peter, Lakhbir, Joe Fijalkowski

  2. Mixed Alphabets with Words • Keyword is given • A Keyword provide a way of mixing of the alphabet that is easy for two correspondents to remember. • Write keyword without repetitions • Then list Alphabet in its usual order.

  3. Example 1 • Keyword is given : GOODMORNING • GOODMORNING - GODMRNI Plain – ABCDEFGHIJKLMNOPQRSTUVWXYZ Cipher- GODMRNIABCEFHJKLPQSTUVWXYZ Plain to cipher: YANA KORTSARTS ---> YGJG EKQTSGQTS Cipher to pain: OR AGLLY ---- BE HAPPY

  4. Example 2 • Plaintext Key Words = old woman • Now rewrite key words with no spaces and no duplicate letters. • Plaintext – oldwman • Now write regular alphabet after the keyword with no duplicates • A B C D E F G H I J K L M N O P Q R S T U V W X Y Z • O L D W M A N B C E F G H I J K P Q R S T U V X Y Z • ex. CUCUMBER now becomes “DTDTHLMQ” • Ex “OKKGM” becomes APPLE

  5. Mixed Alphabets with Columnar Transposition • Method known as keyword columnar transposition substitution. • Keyword is given • Write the keyword in line without repeating words • Mixed alphabets obtained by writing the letters of this array column by column, going left to right

  6. Example 1 • Plaintext – oldwman • Now write keyword on first line, and all other letters in columns under it. • O L D W M A N B C E F G H I J K P Q R S T U V X Y Z • Now go down column by column and write the letters left to right • A B C D E F G H I J K L M N O P Q R S T U V W X Y Z • O B J U L C K V D E P X W F Q Y M G R Z A H S N I T • ex. CUCUMBER now becomes “JAJAWBLG” • Ex “OYYXL” becomes APPLE

  7. Example 2 • KEYWORD: PIZZA • ENCRYPTION: YANA KORTSARTS • P I Z A • B C D E • F G H J • K L M N • O Q R S • T U V W • X Y • ABCDEFGHIJKLMNOPQRSTUVWXYZ • PBFKOTXICGLQUYZDHMRVAEJNSW • DECRYPTION: YANA KORTSARTS --- SPYP LZMVRPMVR • ENCRYPTION: ZMPYXO CR ZMPYXP - ORANGE IS ORANGE

  8. Questions? • Q1. With keyword CRYPTO, using columnar transposition, decipher the text: EIQDDQXT OPDUN HICJET • Q2. With keywords EAT YOUR PEAS, using mixed alphabets with words, decipher the text: VOGYXL AETHOGEMHK • Q3. For columnar transposition, given the keyword BUBBLE BUBBA, what would you actually use to decipher the text?

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