Modified AES based algorithm for MPEG video encryption

Advances in digital content transmission have increased in the past few years. Security of multimedia data is an imperative issue because of fast evolution of digital data exchanges over an unsecured network. Multimedia data security is achieved by methods of cryptography, which deals with encryption of data. Standard symmetric encryption algorithms provide better security for the multimedia data, but applying symmetric key encryption algorithm on more complex multimedia data, problem of computational overhead might be faced. Over the last few years, several encryption algorithms have applied to secure video transmission. While a large number of multimedia encryption schemes have been proposed in the literature and some have been used in real time applications, cryptanalytic work has shown the existence of security problems and other weaknesses in most of the proposed multimedia encryption schemes. Encryption is a common technique to uphold multimedia security. MPEG video stream is quite different from traditional textual data because interframe dependencies exist in MPEG video. Special MPEG video encryption algorithms are required because of their special characteristics, such as coding structure, large amount of data and real-time constraints. Image and video encryption have applications in various fields including internet communication, multimedia systems, medical imaging, and military communication. The Advanced Encryption Standard (AES) algorithm is used and modified it, to reduce the calculation of the algorithm and for improving the encryption performance.