Abstract
Recently, creating security in multimedia systems involving video has become one of the main needs in commercial and military usages. The most important traits of video frames are simultaneousness of frames and high volume of information. Considering these features, A5/1 and W7 stream ciphers are used for video main frames in the field of selective encryption of each DCT transform coefficient.In addition, a suitable method is expressed in order to select the encryption method of DCT transform coefficients by the stream algorithms. The simulation results of MATLAB software show that this method is suitable for multimedia security in terms of both security and execution speed of the algorithm.
Highlights
Nowadays, multimedia data such as images and video are expanding in telecommunications and computer networks rapidly
Discrete cosine transform (DCT) transform has been done on blocks 8 × 8 of I frames, and these coefficients are quantized according to MPEG compression standard matrix
If we want to use cryptography for securing these kinds of data, additional computations will be necessary for processing this information
Summary
Multimedia data such as images and video are expanding in telecommunications and computer networks rapidly. Frequency conversion is done and some percentages of necessary and important coefficients are encrypted in order to reduce the volume of computations [10] Both mentioned transforms are usually used in the process of image and video compaction. In the RVEA method, a key sequence is used for changing randomly the sign bits of quantization coefficients Another method is the use of encryption in entropy coding part. A5/1 and W7 stream encryption algorithms are used following the part of quantization in the compaction process in the field of DCT transform. These algorithms have appropriate security and execution speed compared with the block encryption algorithms like DES, AES, and RC5. LFSRs are clocked in an irregular fashion, in such a way that each time at least two LFSRs are clocked
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