Boosting the Capacity of Web based Steganography by Utilizing Html Space Codes: A blind Steganography Approach

Abstract

Nowadays, Web Steganography is massively used for data hiding. The development of web has expanded the interest for strategies that can guarantee data security on site page. This paper utilizes the html labels (tags) to conceal the secret message. Existing schemes i.e. elements containing other element, changing case letters, line shift, word shift, line break, and changing attributes are not robust across random space modification attacks. Also, imperceptibility of the cover text gets affected. Moreover, these approaches have low embedding capacity for data concealment due to the insertion of only two bits per segment. In this paper, proposed embedding procedure is based on insertion of different space codes in the content containing expressions of web source page. Our proposed scheme hides the secret message bits in the space between the text in html tags by concealing four bits per space; thus by, improving the hidden capacity with minimal perceptivity. Also, proposed method is more secure as secret data have come across some encryption prior to embedding. The experimental result shows that proposed scheme has high capacity by taking 5 variable size texts and comparing these with different existing approaches. Moreover, imperceptibility is also analyzed experimentally by comparing the file change size of the proposed approach with previous methods.