Abstract
As the internet has become the medium for transferring the sensitive information, the security of the transferred message has become the utmost priority. Image steganography has emerged out as the eminent tool of information hiding that ensures the security of the transmitted data. Image files provide high capacity, and their frequency of availability over the internet is also high. In this paper, a method of image coding is proposed that hides the information along a selected pixel and on the next value of the selected pixel, that is, pixel + 1. One bit is hidden at the selected pixel, and the second bit is hidden on the pixel +1 value. On the basis of the 7th bit of the pixels of an image, a mathematical function is applied at the 7th bit of the pixels, which generates a temporary variable (pixel + 1). The 7th bit of the selected pixel and 7th bit of pixel + 1 are used for information hiding and extraction. On the basis of a combination of these two values, two bits of the message can be hidden on each pixel. After implementation, the efficiency of the method is checked on the basis of parameters like PSNR and MSE, and then comparison with some already proposed techniques was done. This proposed image steganography showed interesting, promising results when compared with other existing techniques.
Highlights
Internet has emerged as the most convenient and efficient medium for communication. rough internet, messages can be transferred in a fast and cheap way in various fields like government offices, private sector, military, and medical areas [1]
The data are hidden in the cover media. e cover medium can be in the form of image file, text file, video file, or audio file
A mathematical function is applied to the 7th bit of the pixels. e 7th bits of the selected pixel and pixel + 1 value are extracted, and on the basis of a combination of these two values, 2 bits of the message can be extracted from each pixel. ere can be four possible combinations 00, 01, 10, and 11. is method provides various advantages such as two bits of message storage in each pixel and nondependency of the technique on the 8th bit. ere can be a change of +2 and −2 at maximum in the pixel value while inserting the data in the image file. is method helps in tackling the limitations of steganography to a higher extent
Summary
Internet has emerged as the most convenient and efficient medium for communication. rough internet, messages can be transferred in a fast and cheap way in various fields like government offices, private sector, military, and medical areas [1]. Steganography is defined as a science or art of hiding the message inside some cover medium [2, 3]. Historical records depict that around 440 BC, Herodotus sent secret messages using the concept of steganography. Greeks wrote messages on wood and covered them with wax. Is stego image is transferred to the receiver, and he extracts out the secret message using extraction algorithm [5]. Another data hiding technique, cryptography is used for secure transmission of messages over the internet, but steganography is becoming more popular because of its advantages over cryptography.
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