A Method of Scrambling for the System of Cryptocompression of Codograms Service Components

Abstract

A method of scrambling for a service components system in crypto-compression codograms formed under the condition of discarding the pixel brightness values in RGB space least significant been developed. The difference between this method and the known ones is that, what before performing scrambling transformations, the service data merging presented in a reduced dynamic range into 8-bit combined elements is organized. At the permutation stage of the combined 8-bit data, not only the original 7-bit elements of the service components` values location changing organized, but also their values change too. This allows to increase known permutation transformations cryptographic characteristics. The developed method provides: availability of video data increasing by further reducing the image crypto-compression representation; cryptographic stability increasing by the elements of service data system values changing, breaking the correlation between the elements and changing the frequency of pixels. Scrambling transformations based on permutation tables applied to the service components in cryptocompression codograms system, ensure the stability of the image visual information to errors in codograms that occur in the communication channel. This is despite the fact that cryptocompression codograms are original images concise representation. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.