Improving the visual information security by consistent application of methods for its processing and protection

摘要

To meet the reliability requirements the visual information transmitted over the radio lines over noisy background must be protected using cryptographic protection methods. That is why an agreed application of processing and protection of visual information has been proposed, which consists in maintaining natural redundancy of visual information in the process of compression and in the subsequent use for protection against the mistakes arising in the radio line. The conceptually new approach to consideration of cryptographic information security subsystem not as a part of the information processing closed system, which is isolated and indifferent with respect to above and below levels, but rather as an element of a complex processing and information security system is suggested. A combination of the image blocks permutation and a cipher gamma superimposing is considered as a mechanism of cryptographic protection of visual information. Such combination of classical cryptographic algorithms does not multiply the errors, while the distortions of the separate bits arising by the influence of interference in the radio line are eliminated due to natural redundancy of visual information and noise-immune coding. A software tool has been developed to carry out a correlation analysis of the combined cryptoprotection method stability and the qualitative assessment of its use. A block diagram of the algorithm for synthesizing the parameter of noise-immune encoding and a software tool performing a complete enumeration of the algorithm parameters are developed. A distinctive feature of the software is the ability to obtain statistical data for solving optimization problems to increase the efficiency of the passage of visual information and therefore to increase its reliability. As an example, the parameter values of the optimal noise-immune code for an image frame of 200 KB are provided.