A High Capacity PDF Text Steganography Technique Based on Hashing Using Quadratic Probing

Abstract

In this paper, a novel approach of PDF-based text steganography is presented. A covert communication is achieved by embedding secret information at between-characters positions of words within cover PDF text. A stegoencoding technique is being designed to improve the embedding capacity along with sufficiently reduced overheads of stego-cover PDF file. The proposed method constructs multilevel embedding capacities which can be used according to requirements from higher embedding capacity to typical embedding capacity. Encoding and decoding of secret text is being obtained by implementing quadratic probing of hashing technique that builds up a direct encoding table which provides better performance in term of time complexity. Exploratory outcome exhibits that the proposed technique gives productive algorithms in term upgraded security and high payload of concealed data. Experiential verification and examination of the proposed technique with certain prominent text steganographic techniques demonstrate that proposed technique performs better than current methodologies and free of requirements like shading scheme, languages, wordlist, compression and so forth.

Analysis review on feature-based and word-rule based techniques in text steganography

“…Meanwhile, the performance metrics such as confidentiality, availability, and integrity have the minimum percentage that used by researchers at 4%, 3% and 3% respectively. Embedding time [3,5,23,[26][27][28][29][30][31][32] Calculates the time of the technique that the embedding process consumes. Hiding capacity [3,6,11,17,18,20,22,25,27,30,[33][34][35][36][37][38][39][40][41][42][43] It is the maximum number of bits that could be embedded in the cover medium.…”

Untitled

“…In [7], the author presented LZW compression-based text steganography with email-ids and email texts as career medium of secret data. In [8], text steganography presented by combining the move-tofront, burrows-wheeler-transform and LZW compression methods to obtain improved compression of secret text whereas the cover medium is similar to [7]. In [9], an extension of text steganography [8] is presented in order to improve embedding capacity by the application of the Huffman algorithm.…”

“…In [8], text steganography presented by combining the move-tofront, burrows-wheeler-transform and LZW compression methods to obtain improved compression of secret text whereas the cover medium is similar to [7]. In [9], an extension of text steganography [8] is presented in order to improve embedding capacity by the application of the Huffman algorithm. In [7][8][9] schemes cover text chosen is not natural text that utilizing the set of email-ids as a cover medium may create susceptibility which may be noticeable as unnatural by the human observer and can be tempered.…”

“…In [9], an extension of text steganography [8] is presented in order to improve embedding capacity by the application of the Huffman algorithm. In [7][8][9] schemes cover text chosen is not natural text that utilizing the set of email-ids as a cover medium may create susceptibility which may be noticeable as unnatural by the human observer and can be tempered. An approach of text steganography suggested by [10] utilizing a set of email-ids as career locations of secret text.…”

Secure PDF Text Steganography by Transforming Secret Into Imperceptible Coding

“…The three basic ideas behind robust steganography are embedding capacity, invisibility and imperceptibility. There is a tradeoff among these features to obtain high-quality steganography [3][4][5][6].…”