Research On Anti-jamming Performance Of Subliminal Channel

With the development of information and higher demand in privacy protection, the importance of the security of information is increasing, and how to improve the concealment and security of communication has become a hot topic of research. Subliminal channel, which use public information as a secret carrier to transport secret message, is a typical method of information hidden. Its essence is to conceal the existence of the communications .As the strong concealment of information hiding, we usually preprocess the secret message and then to hidden the message in subliminal channel, this makes the security and unawareness of secret information much better. To strength the concealment and security of information hiding, this thesis research the anti-jamming performance of subliminal channel, and analyse the factors which affect it, and then improve the improved embedded algorithms,finally verify whether the anti-jamming performance improve.Subliminal channel is a confidential communication way that uses cover-media to transmit the confidential information. Usually, an effective communication method needs to have better anvisibility, robustness, security and greater capacity. And as the redundant information digital image contains, it became the main carrier of subliminal channel. Meanwhile, the redundancy of digital image need the embedded algorithms must have a strong anti-compression performance, and the interference of the noise in the transmission make the algorithms have great performance to resist the noise.This article will reseach the anti-jammingperformance of the processed algorithms.This article mainly researches the following problems:(1) Give the fundamental algorithms of image scrambling which based on determinant calculation, sub affine transformation and chaos, and analyse their performance.(2) Introduce the embedded algorithms of subliminal message and analyse the DCT and DWT algorithm in transform domain.(3) Further research the anti-jamming performance of subliminal channel which based on covert communication, and then divided it into two parts: anti-detect and anti-process and then carry out a series of simulate xperiments.(4) Combine the embedded algorithms to research the anti-jamming performance of the three improved image scrambling algorithms. The experimental results show that the algorithm have strong robust against attacks such as noises, compression and filter.And the anti-jamming performance is improved.This article is challenging in improving the anti-jamming performance of subliminal channel, which based on not changing the assuring concealment and embedded capacity. By researching the anti-jamming performance of subliminal channel, we have found the embedded algorithms of well concealment and robustness. In the future, the improved image scrambling algorithms which based on determinant transform, chaos and sub affine transform will be used in other cover-media of subliminal channel. The conclusion will have a broader application range.