چكيده به لاتين
According to increased development of communication on the Internet, media broadcasting, and information sharing environments, creation of a high-secure environments for the communication is essential. Video encryption on a compressed video platform without the need for extra bandwidth can be used in surveillance devices to create a secure layer between the receiver and the transmitter, information without altering the original video content, and preserving the authenticity of the work and many more. The H.264 compression standard is one of the types of video coding standards introduced in 2003 and has in recent years replaced previous standards in Internet communications and public broadcasting environments. By perfect recognition the different parts of the H.264 compression standard and the opportunities and locations that this standard provides for the implementation of the encryption algorithm as a cover file (host), video encryption objectives can be achieved. Because the proposed encryption algorithms have to be compatible with the original video format, have high perceptual security and high encryption speed, and in addition to low computational complexity, keep the video compression ratio constant before and after the encrypting. The purpose of this thesis is to implement two methods of DCT conversion coefficient encryption algorithm after quantization and array values after reordering step. In the first proposed method, a certain number of stepped DCT conversion coefficients of 4 × 4 and 8 × 8 blocks and in the second proposed method, non-zero coefficients and sign bits are encrypted in the I-frame of the luminance components and We have tried to optimize the quantities stated above by choosing the right places to implement the algorithms. Accordingly, the locations and opportunities provided by the H.264 standard for video encryption are fully explored. The design results of both encryption algorithms, based on the implementation of the JM refrence codec in the Windows environment, are presented in various charts and graphs. Both the new proposed encryption algorithm and the performance enhancement required parameters in H.264 video encryption.
