Introduction to Traditional Ciphers: Columnar Transpositions
Traditional ciphers such as Columnar Transpositions involve rearranging plaintext letters based on a fixed number of columns. This technique enhances security by incorporating a keyword for encryption and decryption. Learn about the process and examples of implementing Columnar Transpositions in this informative lecture.
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Principles of Cyber Security Lecture Lecture 08 08: : Traditional Traditional Ciphers_II Ciphers_II Dr. Dr. Muamer Muamer Mohammed Mohammed 1
Objectives Describe the traditional ciphers 8.1 algorithms (Columnar Transpositions).
Simple Columnar Transpositions Where the message is written horizontally in a fixed and agreed upon number of columns and then described letter by letter from the columns proceeding from left to right. The rail fence cipher is a special example. 3
Simple Columnar Transpositions Plain Text Cipher Text T S S O H O A N I W H A A S O L R S T O I M G H W U T P I R S E E O A M R O O K I S T W C N A S N S T H I S I S A M E S S A G E T O S H O W H O W A C O L U M N A R T R A N S P O S I T I O N W O R K S 4
Simple Columnar Transpositions Example 3: Encipher THE JOKER SAID THAT IT WAS ALL PART OF THE PLAN using a simple 5 column transposition cipher. Solution: 5
Simple Columnar Transpositions Example 4: Suppose we want to decipher TOTBA AUJAA KMHKO ANTAU FKEEE LTTYR SRLHJ RDMHO ETEII Solution: 6
Summary Columnar Transposition has the security of a transposition cipher with the extra benefit of utilizing a keyword. Columnar Transposition involves writing the plaintext out in rows, and then reading the ciphertext off in columns one by one. 7
