class-3-31-10

class-3-31-10 - CRYPTOGRAPHY FROM ANTIQUITY TO THE INTERNET...

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CRYPTOGRAPHY FROM ANTIQUITY TO THE INTERNET next
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next The “E” Caesar Shift 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 HERE IS AN EXAMPLE D E F G H I J K L M N O P Q R S T U V W X Y Z A B C D E LIVI MW ER IBEQTPI next
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next 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 M N O P Q R S T U V W X Y Z A B C D E F G H I J K L MVBUK LUATJ KTZSI JSYRH IRXQG HQWPF GPVOE FOUND ENTMC DMSLB CLRKA BKQJZ AJPIY ZIOHX YHNGW XGMFV WFLEU VEKDT UDJCS TCIBR SBHAQ RAGZP QZFYO PYEXN OXDWM NWCVL A B C D E F G H I J K L M N O Z U X Y W V P Q R S T RAGZP next next
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next Since spaces are a giveaway, they are eliminated and the cipher is then broken up into k-grams gtdha qiecq pupre qdtpu dvddq wdigr exdw For k=5 next Conventions: Plaintext in Capital letters Ciphertext in lower case letters
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Blaise de Vigenère (1523-1596) A poly-alphabetic substitution A Cipher deemed ``Unbreakable’’ next
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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 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 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 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 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 The Caesar circular shifts for the key “GOLF” next
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The Vigenere Cipher B b A a C c D d E e F f G g H h I i J j K k L l M m N n O o P p Q q R r S s T t U u V v W w X x Y y Z z b a c d e f g h i j k l m n o p q r s t u v w x y z b a c d e f g h i j k l m n o p q r s t u v w x y z b a c d e f g h i
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This note was uploaded on 09/22/2010 for the course MATH MATH187 taught by Professor Math187 during the Spring '10 term at UCSD.

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class-3-31-10 - CRYPTOGRAPHY FROM ANTIQUITY TO THE INTERNET...

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