Rotational Columnar Transposition Algorithm

Rotational Columnar Transposition Algorithm

Bhumireddy Radha Kumari1, Dr. Ummadi Thirupalu2

1U.G student, Dept. of Computer Science and Engineering, Audisankara College of Engineering &Technology, Gudur, Andhra Pradesh, India

2Associate Professor, Dept. of Computer Science and Engineering, Audisankara College of Engineering& Technology, Gudur, Andhra Pradesh, India

Abstract:

The columnar technique is one of the transposition techniques which is used to secure information by rearranging plaintext characters into a grid based on the key. However, the traditional columnar method has some limitations in protecting information against modern attacks. This paper presents a modification of the columnar algorithm aimed to enhance security by adding a layer of complexity. The modified technique involves rotating the array a number of times, denoted by ‘n’. The ‘n’ value and key are sent to the receiver. The array is then read off in columns, in top-down order according to the keyword, increasing security, even when the attacker knows the key.

Key Words: Cryptography, Encryption, Decryption, Ciphertext, Plaintext, Columnar algorithm, Transposition.