Image compresssion and encryption using scan pattern

Abstract

The methodology of image compression and encryption using scan pattern is an algorithm which is capable of doing both compression and encryption of an image simultaneously. It is a method applied on binary images. The methodology is applied on grayscale sample images, by dividing the grayscale image into its corresponding bit planes. The main aim of the algorithm is to find a good scan path which can compress an image using least bits required. The compression is done using run-length coding. The encryption is done again using a scan path which is kept secret; this is used as the key for encryption. Here in this work the methodology is applied on the sample image in two ways. One is done using single key encryption where there is one key to encrypt and decrypt the image. And another is double key encryption where the scan path for compression is also used as a key for encrypting and decrypting an image.