602 research outputs found
Generating Steganographic Text with LSTMs
Motivated by concerns for user privacy, we design a steganographic system
("stegosystem") that enables two users to exchange encrypted messages without
an adversary detecting that such an exchange is taking place. We propose a new
linguistic stegosystem based on a Long Short-Term Memory (LSTM) neural network.
We demonstrate our approach on the Twitter and Enron email datasets and show
that it yields high-quality steganographic text while significantly improving
capacity (encrypted bits per word) relative to the state-of-the-art.Comment: ACL 2017 Student Research Worksho
Multi-Level Steganography: Improving Hidden Communication in Networks
The paper presents Multi-Level Steganography (MLS), which defines a new
concept for hidden communication in telecommunication networks. In MLS, at
least two steganographic methods are utilised simultaneously, in such a way
that one method (called the upper-level) serves as a carrier for the second one
(called the lower-level). Such a relationship between two (or more) information
hiding solutions has several potential benefits. The most important is that the
lower-level method steganographic bandwidth can be utilised to make the
steganogram unreadable even after the detection of the upper-level method:
e.g., it can carry a cryptographic key that deciphers the steganogram carried
by the upper-level one. It can also be used to provide the steganogram with
integrity. Another important benefit is that the lower-layer method may be used
as a signalling channel in which to exchange information that affects the way
that the upper-level method functions, thus possibly making the steganographic
communication harder to detect. The prototype of MLS for IP networks was also
developed, and the experimental results are included in this paper.Comment: 18 pages, 13 figure
JPEG steganography: A performance evaluation of quantization tables
The two most important aspects of any image based steganographic system are the imperceptibility and the capacity of the stego image. This paper evaluates the performance and efficiency of using optimized quantization tables instead of default JPEG tables within JPEG steganography. We found that using optimized tables significantly improves the quality of stego-images. Moreover, we used this optimization strategy to generate a 16x16 quantization table to be used instead of that suggested. The quality of stego-images was greatly improved when these optimized tables were used. This led us to suggest a new hybrid steganographic method in order to increase the embedding capacity. This new method is based on both and Jpeg-Jsteg methods. In this method, for each 16x16 quantized DCT block, the least two significant bits (2-LSBs) of each middle frequency coefficient are modified to embed two secret bits. Additionally, the Jpeg-Jsteg embedding technique is used for the low frequency DCT coefficients without modifying the DC coefficient. Our experimental results show that the proposed approach can provide a higher information-hiding capacity than the other methods tested. Furthermore, the quality of the produced stego-images is better than that of other methods which use the default tables
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