There is a modern type of encryption called selective encryption which depends on the choice of some sensitive areas. The encryption of these areas leads to destroy the whole file. This type of encryption is more compatible with compressed files such as Moving Picture Expert Group (MPEG) video files and Joint Picture Expert Group (JPEG).This compatibility produced from a large amount of information focused in a small area more than non-compressed files.The (MPEG-1) video file contains three types of pictures reference (I), predicted (P) and bidirectional (B) pictures. The most important one among these three types is (I) picture, which is the basis that other types (P and B) were derived from, P pictures are predicted from (I) only in one direction (Forward prediction) and (B) pictures were predicted from (I) and (P) in the two directions (Forward/ Backward prediction), therefore the encryption of (I) pictures only lead to destroy most of visual information (encryption in the first degree of complexity), while the encryption of (I) and (P) pictures together lead to destroy all visual information (encryption in the second degree of mplexity) with no need to encrypt (B) pictures. It is important to mention that the total number of (I and P) pictures within the MPEG-1 file is less than the total number of (B) pictures only, leaving a large amount of information without encryption and reduced the time needed for implementation.In the proposed encryption system, three encryption methods were used Fibonacci, Galois and the Proposed method (Random Seed Values). The proposed method was developed to compete other methods with a smaller probability of breaking encrypted files. The execution time of Galois method is faster than other methods, The encryption system was implemented using Visual Basic 6.0 programming language. The fidelity measures (MSE) and (PSNR) are used to check the result of the whole developed techniques.
