Visual Encryption Using Block based Scrambling Followed by Affine Encryption Technique

Author:

Maurya Durgesh Kumar1,Pathak Rajesh Kumar2,Yadav Komal3

Affiliation:

1. Shri Rawatpura Sarkar University Raipur, Chhattisgarh, India

2. Professor, Shri Rawatpura Sarkar University Raipur, Chhattisgarh, India

3. Assistant Professor, Shri Rawatpura Sarkar University Raipur, Chhattisgarh, India

Abstract

This article reports the Block based cipher concept followed by the affine cipher technique. The Image considered was grouped into squared (16, 32 and 64) pixel blocks then each column was shifted by specific values. These values were randomly generated prime numbers and worked as the key for scrambling. These images were investigated for their quality of scrambling using histogram and adjacent pixel correlation. The adjacent pixel correlations for 16, 32 and 64 pixel-based ciphered images were found as 0.7907, 0.7292, and 0.4783 respectively. The analysis gave the information that the level of scrambling was not satisfactory, therefore; the affine cipher technique was applied to each of the images. These images were converted into the matrix format and each element was transformed using the affine cipher. This transformed matrix is again converted inform from the image to visualize. The Histogram and adjacent pixel correction for these images were much improved.

Publisher

Technoscience Academy

Subject

General Medicine

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