Shannon's Principle of Diffusion Transposition Cipher MESSAGE FROM MARY STUART KILL THE QUEEN 1 23456789 Key =9 columns MESSAGEFR Plaintext in OMMARYST U ART LLT H EQUEEN Extended key: 491753286+ order of columns Ciphertext out 9!=362880keys MOAEE MRQSM TUSAK EARIE GYLNE SLETT RUH SMTUE SLGYL NMOAE ARIER UHSAK EFTTE MRQ Diffusion means permutation of bit or byte positions9 4 9 1 7 5 3 2 8 6 Extended key: order of columns 9! = 362‘880 keys Shannon‘s Principle of Diffusion Transposition Cipher MESSAGE FROM MARY STUART KILL THE QUEEN M E S S A G E F R O M M A R Y S T U A R T T H E K I L L Q U E E N Plaintext in Ciphertext out MOAEE MRQ MOAEE MRQSM TU MOAEE MRQSM TUSAK E MOAEE MRQSM TUSAK EARIE MOAEE MRQSM TUSAK EARIE GYLN MOAEE MRQSM TUSAK EARIE GYLNE SLFTT RUH Diffusion means permutation of bit or byte positions ! 1 2 3 4 5 6 7 8 9 Key = 9 columns SMTUE SLGYL NMOAE ARIER UHSAK EFTTE MRQ