Double Transpositions

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Presentation transcript:

Double Transpositions This method repeats simple transposition two times, each time with different key.

Double Transpositions encryption Ex : If we use a fixed period with two different keys. P= athiedeibrahem with d=4, k1= 3142, k2= 4123

Double Transpositions encryption

Double Transpositions encryption

Substitution Ciphers 1. Simple 2. Homophonic 3. Polyalphabetic 4. Polygram (Polygraphic)

Substitution Ciphers

Caesar cipher The earliest known use of a substitution cipher, and simplest, was by Julius Caesar: The Caesar cipher involves replacing each letter of the alphabet with the letter's standing three places further down the alphabet.

The Caesar cipher Outer: plaintext Inner: ciphertext

The Caesar cipher K=3

The Caesar cipher K=3