Shyrochyn S. Methods combined steganographic protection of multimedia data in cloud storages

The work is devoted to solving actual scientific and technical problem of protection of sensitive multimedia in cloud storages by developing new and modifying existing protection methods based on LSB-steganography and LW-cryptography protection of multimedia data in image containers and audio containers using private and public keys. New methods of protection of multimedia data in cloud storage have been developed, providing secure data transmission while reducing time expenses, in particular - the stegodata fragmentation method, steganography method based on complementary image and palette encryption method. Proposed methods use composite block keys and stream keys of random length. A reduction of time complexity of multimedia data protection methods hs been proposed by parallelizing computations on cores of multicore processor and simplifying masking transformations to protect stegodata in the container. The experimental model of steganography system MultiHide has been developed to implement and analyze both the above mentioned methods and basic methods of LSB-steganography and LSB-steganography using AES-cryptography, and also for research of program implementation of appropriate cloud security services.