The Audio Steganography And Hardware Realization

Going with fast development of the Internet and the multimedia technological, the information security has gradually becomes the key point which people must pay attention. As an important branch of the information hiding, with many generation of scientific research scholar's endeavor, Steganography had obtained considerable progress. With the techniques of steganography in wav audio frequency, one steganography algorithm based on the coefficient replacement of audio is presented. In the foundation of the algorithm, we took TI-DSP as the hardware platform, designed the hardware realization diagram, builted the concrete hardware electric circuit, and given the essential spot procedure tabulation.The main content of this thesis is summarized as follow:First of all, the basic of audio steganography.In order to facilitate the transmission of the secret information, the guarantee secret intelligence transmission security, establishes a secret channel. At the precondition of affect the primitive audio frequency quality, the use numeral tonic train signaling characteristic, the humanity visual characteristic, insert the secret information realization secret transmission to the primitive tonic train signaling in the process. This part elaborated in detail the digital audio frequency this multimedia form characteristic, the history of audio frequency steganography, and the model of audio frequency steganography mathematical. Finally, also mentioned in this part the steganalysis, this technology and the steganography are a pair of contradictory body.Secondly, This part proposed one kind of steganography technology based on the coefficient replacement. Under the structure DCT territory, the transition coefficient replacement, the realization audio frequency information hidden has written. This algorithm establishment in the human vision model foundation, after the experimental contrast, uses the optimized coefficient trial-and-error method, gives dual attention to the invisibility which hidden writes, hidden writes the capacity. The experiment proved that, passes through to the algorithm improvement, this hidden writes the algorithm to have the very good invisibility, can resist attacks effectively and on low pass filter, heavy sampling, Gauss noise.Thirdly, Building the hardware electric circuit. In the foundation of the steganography, we also established the hardware electric circuit frame. This article introduced the system platform realization software design and the hardware architecture in detail. At the hardware design process, we take the DSP as the hardware platform. The hardware system uses TLC320AD50 to realize A/D, the D/A transformation module design, uses the TMS320C54x realize the function. This article has carried on the introduction to the TLC320AD50 functional block diagram and the main function, had given the TLC320AD50 chip concrete realization flow, and elaborated the DSP chip and A/D, the D/A transformation module connection design in detail. In the software design process, includeing the chip initialization, the audio frequency broadcast and gathering, the disposal procedure. This article carried on showing regarding the realization chip initialization operation function and the audio frequency broadcast function, gave the signal hidden to write processes the MATLAB procedure.Based on the CCS3.3 integrated development environment simulation, we had good realization of the algorithm and build a good foundation of hardware platform.