Abstract
Nowadays Digital Images find a lot of applications almost in all the fields, for e.g. Information Hiding. Security of these images is very important. Image encryption is one method of providing security to digital images. In this paper we have proposed a method for Image scrambling which is based on a combination of spatial and frequency domain. Four different Non sinusoidal transforms, Walsh , Slant ,Kekre and Haar were used. Three different types i.e Row , Column and Full Transforms of these four transforms were applied for Image scrambling , out of these four Kekre Transform gave the best result
Highlights
With the widespread of Digital Image data, over internet it has become very important to provide security to these digital images
In this paper we have proposed a method for Image scrambling which is based on a combination of spatial and frequency domain
Three different types i.e Row, Column and Full Transforms of these four transforms were applied for Image scrambling, out of these four Kekre Transform gave the best result
Summary
With the widespread of Digital Image data, over internet it has become very important to provide security to these digital images. An encryption technique based on pixels is proposed in[1]. At the decryption side , appropriate arrangement of shares of key and image makes the retrieval of hidden data [4] proposed a novel encryption method called as Bit Recirculation Image Encryption(BRIE). In [5] , a modification to AES is been proposed to provide a high level of security and better image encryption. Experimental results show that the proposed method takes optimal amount of time compared to other traditional techniques. The two main features of the proposed scheme are the decryption algorithm is able to reconstruct the original image even if the encrypted image is JPEG compressed. The proposed method has an advantage that the encrypted image can be compressed and transmitted across the network saving the bandwidth. The proposed method can be used for low level encryption in which the cipher image has a degraded visual quality but reflects the contents of the plain text-image or high level encryption in which the cipher image does not reveal any information about the plain –text image
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