Parametric mimicry signals modulated oscillations formed in various functional basis

Information security issues associated with the use of cryptographic systems of protection. However, this approach gives information systems specific set of features that reveal the fact that the use of these measures. Therefore, finding ways to ensure information security remains an urgent and important task in the design and operation of data transmission systems.

Under the concept of stealth signals understand the properties that impede the effective implementation of the procedures for their detection and measurement in order to retrieve the embedded information.

Stealth signals are divided into energy, and structural information. Energy secrecy involves the creation of conditions under which the implementation of procedures for detecting the very fact of communication tools. Concealment information encoding methods based on messages as at the bit level and at the level semantics. Structural secrecy characterizes the ability of signals to resist measures aimed at identifying their parameters.

In the recent attention paid to ensuring the structural stealth. This is due to the fact that the technology implementation time and energy electromagnetic stealth impair the availability of correspondents, and informational signs stealth provoke the use of means jamming.

An approach to providing structural stealth signals by their synthesis in bases other than those used in systems analysis, offering unauthorized access. The advantage of these features is that formed on the basis of the signal is all external signs of the modulated oscillation synthesized harmonic basis.

Such an approach to structural stealth similar phenomenon of mimicry in nature, so stealth, which manifests itself in the wrong choice of the basis of analysis, defined as parametric mimicry. As oscillations with close temporal structure of the proposed fragments sinusoid and Gaussian wavelet of the first order, which presents the first derivative of the Gaussian function.

The signals thus generated in the time and frequency domains resemble harmonics. Visual and auditory analysis does not identify the signal as it is similar to the noisy harmonic signal.

Parametric mimicry increases with increasing ratio of the number of fragments to fragments harmonic wavelets. Practical interest such signals will be presented only if they developed to provide reliable demodulation techniques to extract information for the signal/noise ratio of the order of 15 dB.

Along with the traditional approaches, increasing structural stealth possible through the use of parametric stealth effect, which occurs when analyzing the signals generated from the vibrations of different functional bases, only one of the bases.

The authors suggest that this effect may be enhanced with the increase in the number of bases used.