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Substitution Ciphers

Substitution Ciphers. Substitute a letter with another letter Caesar Cipher Mono alphabetic Very easy to break Vigenere Cipher Poly alphabetic Took 300 years to break Kasiski Attack Now we know it is easily breakable. Vigenere Cipher Table A B C D E F G H I J K L M N O P

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Substitution Ciphers

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  1. Substitution Ciphers • Substitute a letter with another letter • Caesar Cipher • Mono alphabetic • Very easy to break • Vigenere Cipher • Poly alphabetic • Took 300 years to break • Kasiski Attack • Now we know it is easily breakable Vigenere Cipher Table A B C D E F G H I J K L M N O P A A B C D E F G H I J K L M N O P B B C D E F G H I J K L M N O P Q C C D E F G H I J K L M N O P Q R D D E F G H I J K L M N O P Q R S E E F G H I J K L M N O P Q R S T F F G H I J K L M N O P Q R S T U G G H I J K L M N O P Q R S T U V H H I J K L M N O P Q R S T U V W I I J K L M N O P Q R S T U V W X J J K L M N O P Q R S T U V W X Y K K L M N O P Q R S T U V W X Y Z

  2. Plaintext: TO BE OR NOT TO BE THAT IS THE QUESTION Keyword: RELATIONS Keyword: RELAT IONSR ELATI ONSRE LATIO NSREL Plaintext: TOBEO RNOTT OBETH ATIST HEQUE STION Ciphertext:KSMEH ZBBLK SMEMP OGAJX SEJCS FLZSY Keyword: RELAT IONSR ELATI ONSRE LATIO NSREL Ciphertext:KSMEH ZBBLK SMEMP OGAJX SEJCS FLZSY Plaintext: TOBEO RNOTT OBETH ATIST HEQUE STION

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