Secure Hybrid Spread Spectrum System for Steganography in Auditive Media

Abstract

Steganography is used to embed secret messages in cover media. This is especially important in areas, where the use of cryptography is prohibited. In this paper, we introduce a novel hybrid steganographic algorithm for digital audio data. We enhance a direct sequence spread spectrum (DSSS) system with aspects of frequency hopping to vary the carrier frequency of the binary phase shift keying (BPSK) signal, representing the secret message. Further, we adopt the number of chips per secret bit. These modifications give a more secure steganographic system, making guesses about the bit-rate or message length less feasible. Further, an adaptive amplitude control is used to guarantee inaudibility, even in silent passages. After an overview of the DSSS technique, we highlight our contributions to form a more secure steganographic system. The results from our working prototype are pointed out and further usage scenarios in relation to future research are given.

Improved adaptive partial-matching steganography for Voice over IP

“…The authors pointed out that they can often achieve good robustness but relatively low steganographic bandwidths (not more than 20 bit/s). Further, Nutzinger et al [41] proposed a hybrid steganographic algorithm that combined DSSS with frequency hopping and bit-rate variation. The authors typically implemented this algorithm and pointed out that the algorithm has none to negligible influence on the speech quality according to their experimental results.…”

Exploring the Challenges of MP3 Audio Steganography

“…Many Researchers [28][29][30] modify some quantized spectrum values of audio layer III to embed secret information into audios. One of them is based on the technology of spectrum shift, when the distribution of human speech becomes located in unheard places of the music spectrum.…”

Steganographic Techniques Classification According to Image Format

“…In order to do this, it is neither necessary to adapt the mark to the medium so that the signal it represents is not too low (risks of non-detectability) nor problems of robustness nor too strong (erasure of the initial signal and therefore too great degradation of it). Spectrum spreading [11] is a technique used in radio telecommunications, especially by the military, to disperse a signal over a wide frequency band to make it discreet and resistant to interference.…”