Hardware-software realisation of the generator of subkey based on the cellular automata
This article describes approaches and the basic problems of existing methods of encryption methods – low reliability of information protection and low speed of their implementation. Is described the method of encryption of videodata based on cellular automata, which allows to raise reliability of protection of a videoinformation, to increase length of a key of encryption, to raise speed of encryption images and to simplify preparation of initial parameters for the subkeys formation block. According to aforementioned method, the image that you want to encrypt, digitizes and submit to the encryption block in distorted form. This form is due to the law given scan, which belongs to the key data. The encryption block uses subkeys, which generate by special structure, implemented on two cellular automata. The main cellular automata transmits excitation signal from cell to cell and additional cellular automata carries alteration of all its cells under a given function and selected neighborhood. Is described software and hardware implementation of subkeys generator for video encryption system, which is based on the aforementioned method. This generator is implemented using two cellular automata, which allows you to create key gamma in implicit form. The additional cellular automata operate at every cycle time so that all its cells perform XOR operation on signals from the cell neighborhood and its own state. The state of the main cellular automaton with each successive clock signal can change in a single cell, which at the time clock was excited. Also excited cell goes dormant and cell neighborhood, which passed excitation signal, becomes excited. Information signal from cell of cellular automata goes to output only when the cell is in an excited state. Gamma depends on the initial map state of cellular automata and initial settings of trajectory. The generator is implemented on low-cost FPGA with high performance, which allow encrypting videoinformation in real time in the transmission of the communication channels.
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