3D - Playfair cipher with additional bitwise operation

Abstract

3D-Playfair cipher is multiple letter encryption cipher. In this, trigraphs of plaintext are treated as single units and converted into corresponding cipher text trigraphs. 3D-Playfair Ciphers originates due to the limitations in classical Playfair as it supports only alphabets and may not support two alphabets at the same time. It also eliminates the fact that a diagram and its reverse will encrypt in a similar fashion. 3D-Playfair cipher supports all 26 alphabets, 10 digits and 28 special characters. The theme of research is to furnish security to data which contains alphabets numerals and special characters during transmission that's why additional bitwise operations are introduced and applied on the cipher text of 3D-Playfair cipher with a random key. Linear Feedback Shift Register is a good candidate for generation of random sequences and is selected for generating random keys for bitwise operations to offer better security to cipher text before transmission over the internet. Here X-OR or X-NOR operations are taken into consideration for the bitwise operations based on the key.

New symmetric key cipher capable of digraph to single letter conversion utilizing binary system

“…Linear Feedback Shift Register is used for producing random keys based XOR or XNOR operations. 3D-Playfair Cipher and additional Bitwise Operation together are exhibited a high confusion and diffusion rate rapidly that enhance the cipher text security and can be simply implemented with coming of new computer [22] This algorithm is improving classical Playfair but is still converting pairs to pairs not to single.…”

“…it is fallen under private key cryptographic algorithm. But as public key cipher is more secured then private key cipher the algorithm is need be to develop and implement a public key in an easy mode [22].…”

Enhancing Communication Using 8 × 8 Extended Playfair Cipher and Steganography

“…Verma et al [18] proposed an advancement of the playfair cipher in which the 5× 5 matrix is replaced by a 4 × 4 × 4 three dimensional matrix to accommodate 64 characters that include all the uppercase 26 alphabets, 10 numeric digits and 28 special symbols. However lowercase alphabets cannot be handled and the diagraph formed consists of three characters.…”

Implementation of Modified Playfair CBC Algorithm

“…Totally different variety of cipher attacks and non-vulnerability of recent cipher has been mentioned. A few contributions were also noticeable [7][8][9][10][11].…”