METHOD AND DEVICE FOR STEGANOGRAPHIC HIDING AND EXTRACTION OF DATA IN SPATIAL DOMAIN WITH USE OF DIRECT SPECTRUM BROADENING (EMBODIMENTS)

摘要

A group of inventions relates to hidden transmission of digital information. A method for steganographic data hiding and extraction in spatial domain with use of direct spectrum broadening consists in that adaptive spreading discrete signals are used, herein, statistic properties ofcontainer units are considered, i.e. value of correlation factor moduloforandcannot exceed the predetermined value(the preset threshold):For invention implementation two modifications of the device is proposed, specifically – a device for data steganography hiding in image spatial domain with use of spectrum direct broadening, which comprises five inputs, an output, an information data input block, an encryption key input block, a pseudorandom sequences key shaping input block, a key alternation input block, a container input block, an encryption block, a protective coding block, a pseudorandom generator, a modulator, an alternation unit, an adder unit, a quantization unit, a steganogramm shaping/display unit, wherein a pseudorandom sequences selection unit is incorporated, first input thereof is connected to the pseudorandom generator, the second input is connected to the input of container input block, the output is connected to the modulator second input. A second device – a device for steganography data extraction from image spatial domain with use of direct spectrum broadening comprising five inputs, an output, an information data input block, an encryption key input block, a pseudorandom sequences key shaping input block, a key alternation input block, a container input block, an encryption block, a protective coding block, a pseudorandom generator, a modulator, an alternation unit, adder unit, a quantization unit, a steganogramm shaping/display unit, wherein an adaptation unit is incorporated (storage unit), input thereof is connected to the output of pseudorandom sequences key shaping input block, the output is connected to the second input of pseudorandom generator. The said group of inventions allows substantially increase of of built-in data extraction.