L08-Cipher-Transposition

L08-Cipher-Transposition - Transposition Methods •...

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Transposition Methods Transposition Methods • Permutations on places • Key is the indication of the transposition mapping
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Rail Rail - - Fence Cipher Fence Cipher •M e t h o d : – Plaintext is written down as a sequence of diagonals and then read of as a sequence of rows •P l a i n t e x t : we will meet on monday •E x a m p l e : w w l m e o m n a e i l e t n o d y •C i p h e r t e x t : wwlmeomnaeiletnody
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Repeated Row Repeated Row - - Column Cipher Column Cipher Plaintext is written in a rectangle, row by row, and ciphertext is read from the rectangle, column by column, in a permuted column order. K e y : 2541 3 Plaintext: we will meet on monday Table w e w i l l m eet onm on dayX X Ciphertext: ieoXwlodltnxwemyemna Repeat the row-column transposition several times
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Attacks on Transposition Methods Attacks on Transposition Methods • Transposition cipher can be easily recognized, because it has the same letter appearance frequencies as the original text
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L08-Cipher-Transposition - Transposition Methods •...

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