Radchenko Y. Algorithmic support and software of Internet user’s multimedia data protection systems.

The dissertation is devoted to increase the efficiency of software for Internet user’s multimedia data crypto-steganographic protection by improving the architecture of the software protection system and developing new algorithmic and software methods for multimedia data crypto-steganographic protection. The dissertation provides a number of new scientific results, in particular, the universal architecture of the software system for Internet user’s multimedia data protection, which simplifies the process of software development of multimedia data protection systems and provides the ability to use arbitrary methods of crypto-steganographic data protection and provide multimedia data from different software environments, has been proposed for the first time. An algorithmic software method of multimedia data crypto-steganographic protection, the characteristic feature of which is the possibility of combining with other methods of LSB-steganography to increase their steganographic stability and which, unlike the known ones, relies on the encryption procedure based on bit correspondence scheme and logic function that allows to protect multimedia data and increase the speed of embedding procedure in more than 5 times, has been developed for the first time. An algorithmic software method of crypto-steganographic multimedia data protection which, unlike the known ones, is based on the use of the Huffman tree procedure based on the key-image, which allows to increase the level of protection of confidential graphic data agains the key search in 17.4 times, has been developed for the first time. An algorithmic software method of multimedia data crypto-steganographic protection, the defining feature of which is the application of pseudo-random data embedding procedure using two pseudo-random number generators, and which is characterized by high resistance to the key search due to increasing entropy characteristics and variable number of keys that enables multimedia data protection, has been developed for the first time.