Secure PDF Text Steganography by Transforming Secret Into Imperceptible Coding

Abstract

In this paper, we have proposed an approach of PDF based text Steganography by considering the hiding capacity and security of secret information, and improved imperceptibility of stego-cover file. In proposed approach secret information are transformed into compact and encrypted form of imperceptible coding, and then translated into bits form, thereafter embedded into targeted locations of PDF file by applying new cross-reference coding technique in incremental updates of PDF file with less computation complexity. The proposed extraction process provides authentication of received stego-cover file such that only desired file is accepted for the extraction process otherwise fake file is discarded by recipient. Time complexity has been improved significantly by implementing a novel method of PDF steganography for embedding the secret data. Experimental result demonstrates that proposed method provides efficient algorithms in terms of improved security of hidden information.